With Comparison Patents (Class 250/565)
  • Patent number: 10413666
    Abstract: The present disclosure describes embodiments of a patient monitoring system and methods that include the measure and display of hemoglobin statistics. In an embodiment, total hemoglobin trending is displayed over a period of time. Statistics can include frequency domain analysis, which may be unique for each patient monitored. The total hemoglobin trending and/or statistics can further be used to help control the treatment of a patient, such as being used to control IV administration.
    Type: Grant
    Filed: October 20, 2017
    Date of Patent: September 17, 2019
    Assignee: Masimo Corporation
    Inventors: Ammar Al-Ali, Massi Joe E. Kiani, Michael O'Reilly
  • Patent number: 10184889
    Abstract: A sensor device for optically detecting characteristics of a fluid. The device includes a housing with a base portion from which first and second appendages extend at least partially facing one another, and between which in use a fluid is present, and first and second optoelectronic devices adapted to transmit and receive radiation, respectively, mounted at the first and second appendages of the housing, respectively. The arrangement is such that in use a radiation beam transmitted by the first optoelectronic device propagates in an optical path which includes a portion crossing the fluid between said appendages and reaches the second optoelectronic device. This optical path includes at least one reflecting surface made integrally in an appendage of the housing and adapted to deflect the radiation beam between the associated optoelectronic device and the fluid crossing portion.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: January 22, 2019
    Assignee: BITRON S.P.A.
    Inventor: Fabio Arpino
  • Patent number: 10088468
    Abstract: A system of measuring hemoglobin and bilirubin parameters in a whole blood sample using optical absorbance. The system includes an optical-sample module, a spectrometer module, an optical fiber module optically connecting the optical-sample module to the spectrometer module, and a processor module. The optical-sample module has a light-emitting module having a LED light source, a cuvette and a calibrating-light module. The processor module receives and processes an electrical signal from the spectrometer module and transforms the electrical signal into an output signal useable for displaying and reporting hemoglobin parameter values and/or total bilirubin parameter values for the whole blood sample.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: October 2, 2018
    Assignee: Nova Biomedical Corporation
    Inventors: Michael S. Cafferty, Scott P. Cionek
  • Patent number: 10019879
    Abstract: A smoke detector having a light source for generating a beam of light is disclosed. The smoke detector is arranged to transmit the beam along an optical axis and includes a sensor for receiving light scattered from the beam off the optical axis by smoke; and a light trap comprising one or more walls that define a volume for receiving light that passes unscattered from the light source past the sensor along the optical axis. The volume includes a first end closest on the optical axis to the light source; and a second end furthest on the optical axis from the light source. The volume is open at said first end but is otherwise closed, and at least one of the walls is sloped from the first end to the second end, such that the light trap progressively narrows from the first end axially towards the second end.
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: July 10, 2018
    Assignee: Apollo Fire Detectors Limited
    Inventors: Gregory Michael Cruse, Philip Watson, Robert David Knight
  • Patent number: 9795739
    Abstract: The present disclosure describes embodiments of a patient monitoring system and methods that include the measure and display of hemoglobin statistics. In an embodiment, total hemoglobin trending is displayed over a period of time. Statistics can include frequency domain analysis, which may be unique for each patient monitored. The total hemoglobin trending and/or statistics can further be used to help control the treatment of a patient, such as being used to control IV administration.
    Type: Grant
    Filed: June 16, 2016
    Date of Patent: October 24, 2017
    Assignee: Masimo Corporation
    Inventors: Ammar Al-Ali, Massi Joe E. Kiani, Michael O'Reilly
  • Patent number: 9778185
    Abstract: This disclosure relates generally to analytical instruments for measuring one or more properties of specimens or samples to be analyzed and, more particularly, to an analytical instrument with an adjustable optical path length. An analytical instrument may include a specimen support upon which a specimen may rest and a compression plate for controllably adjusting an optical path length of the specimen between the specimen support and the compression plate. In particular, a specimen may contact both the specimen support and the compression plate such that controlling a distance of the compression plate with respect to the specimen support effectively controls the optical path length of the specimen. An analytical instrument may include collimating lenses to collimate electromagnetic energy for transmission through a specimen and converging lenses for directing electromagnetic energy transmitted through the specimen into one or more sensors.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: October 3, 2017
    Assignee: Laxco Incorporated
    Inventors: Congliang Chen, Kevin Cassady
  • Patent number: 9594088
    Abstract: Disclosed is a use of reaction kinetics to generate multiple dose-response curves from a single reaction, thus eliminating the need to run a second experiment with additional sample, reagents, and time to cover a broader measuring range than is available in a standard assay. Using a single protocol, the differences in the reaction kinetics for different sample concentrations yield different responses at different measurement times. Selection of the appropriate dose-response curve cross-section increases the measuring range and accuracy of the assay from a single reaction without substantially increasing imprecision. Several overlapping dose-response curves are pieced together to provide a standard curve to ensure continuity throughout the expanded measuring range.
    Type: Grant
    Filed: February 4, 2013
    Date of Patent: March 14, 2017
    Assignee: Orth-Clinical Diagnostics, Inc.
    Inventor: Theodore J. DiMagno
  • Patent number: 9370325
    Abstract: The present disclosure describes embodiments of a patient monitoring system and methods that include the measure and display of hemoglobin statistics. In an embodiment, total hemoglobin trending is displayed over a period of time. Statistics can include frequency domain analysis, which may be unique for each patient monitored. The total hemoglobin trending and/or statistics can further be used to help control the treatment of a patient, such as being used to control IV administration.
    Type: Grant
    Filed: May 18, 2015
    Date of Patent: June 21, 2016
    Assignee: Masimo Corporation
    Inventors: Ammar Al-Ali, Massi Joe E. Kiani, Michael O'Reilly
  • Patent number: 9267884
    Abstract: A particle detection system including; at least one light source adapted to illuminate a volume being monitored at at least two wavelengths; a receiver having a field of view and being adapted to receive light from at least one light source after said light has traversed the volume being monitored and being adapted to generate signals indicative of the intensity of light received at regions within the field of view of the receiver; a processor associated with the receiver adapted to process the signals generated by the receiver to correlate light received at at least two wavelengths in corresponding regions within the field of view of the receiver and generate an output indicative of the relative level of light received at the two wavelengths.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: February 23, 2016
    Assignee: Xtralis Technologies Ltd
    Inventors: Ron Knox, Karl Boettger, Kemal Ajay
  • Patent number: 9057485
    Abstract: A beam detector including a light source, a receiver, and a target, acting in cooperation to detect particles in a monitored area. The target reflects incident light, resulting in reflected light being returned to receiver. The receiver is capable of recording and reporting light intensity at a plurality of points across its field of view. In the preferred form the detector emits a first light beam in a first wavelength band; a second light beam in a second wavelength band; and a third light beam in a third wavelength band, wherein the first and second wavelengths bands are substantially equal and are different to the third wavelength band.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: June 16, 2015
    Assignee: Xtralis Technologies Ltd
    Inventors: Ron Knox, Karl Boettger, Kemal Ajay
  • Patent number: 9029819
    Abstract: A gas detection system with an inner ring cavity fiber laser using saturated absorption optical fiber is provided. The system comprising a ring fiber laser consisted of a pump source, a wavelength division multiplexer, a first active optical fiber, a first coupler, a fiber Bragg grating and a second coupler connected successively; an optical isolator coupled between said first active optical fiber and said first coupler; a second active grating connected between said fiber Bragg grating and said first coupler; a detection gas chamber connected between said first coupler and said second coupler; a first photoelectric detector for detecting the laser intensity outputted from said ring fiber laser to generate a first light intensity signal; a second photoelectric detector for receiving the intensity measuring beam passing through the detection gas chamber to generate a second light intensity signal; and a feedback control unit.
    Type: Grant
    Filed: October 8, 2014
    Date of Patent: May 12, 2015
    Assignee: Beijing Information Science & Technology University
    Inventors: Lianqing Zhu, Fei Luo, Mingli Dong, Wei He, Yinmin Zhang, Xiaochen Meng, Zhehai Zhou
  • Publication number: 20150115180
    Abstract: A method and apparatus are provided for automatically detecting the type of replacement fluid loaded by the operator during a therapeutic exchange procedure and to provide a warning alarm if an incorrect fluid is used. After the operator connects the container of replacement fluid to the replacement fluid line of a single-use kit and enters into the controller an identification of the exchange procedure to be performed, the replacement fluid is flowed through a segment of the kit in proximity to a sensor associated with the hardware component that detects the type of fluid flowing through the segment. The controller verifies whether the replacement fluid detected in the segment corresponds to that appropriate for the selected exchange procedure, and notifies the operator in the event that an incorrect replacement fluid has been loaded.
    Type: Application
    Filed: October 31, 2013
    Publication date: April 30, 2015
    Applicant: FENWAL, INC.
    Inventors: Matthew Schoonover, Lan T. Nguyen, David Stude, Elizabeth Nelson
  • Publication number: 20150102240
    Abstract: A gas detection system with an inner ring cavity fiber laser using saturated absorption optical fiber is provided. The system comprising a ring fiber laser consisted of a pump source, a wavelength division multiplexer, a first active optical fiber, a first coupler, a fiber Bragg grating and a second coupler connected successively; an optical isolator coupled between said first active optical fiber and said first coupler; a second active grating connected between said fiber Bragg grating and said first coupler; a detection gas chamber connected between said first coupler and said second coupler; a first photoelectric detector for detecting the laser intensity outputted from said ring fiber laser to generate a first light intensity signal; a second photoelectric detector for receiving the intensity measuring beam passing through the detection gas chamber to generate a second light intensity signal; and a feedback control unit.
    Type: Application
    Filed: October 8, 2014
    Publication date: April 16, 2015
    Inventors: Lianqing Zhu, Fei Luo, Mingli Dong, Wei He, Yinmin Zhang, Xiaochen Meng, Zhehai Zhou
  • Publication number: 20140273193
    Abstract: The present invention provides electrokinetic microfluidic cytometers useful for detecting and/or sorting fluid-borne particles. In some embodiments, the electrokinetic microfluidic flow cytometer apparatus comprises a substrate having a microchannel formed therein, a particle-sensing gate that reduces the cross-sectional area of a portion of the microchannel, a pair of signal- and noise-detection electrodes, and a particle-detection circuit that is electrically connected to the signal- and noise-detection electrodes and is configured to generate a particle-detection signal responsive to differences in resistivity across the particle-sensing gate.
    Type: Application
    Filed: November 26, 2013
    Publication date: September 18, 2014
    Applicant: Diagnostic Chips, LLC
    Inventor: Dongqing Li
  • Publication number: 20140224990
    Abstract: One embodiment relates to an apparatus comprising a light source adapted to transmit light through a liquid, and a detector adapted to detect an intensity of the light after it passes through the liquid. The apparatus may also include a device to process data relating to the intensity of the infrared light and compare the processed data to predetermined control data. The apparatus may also include a controller adapted to transmit a signal to a liquid dispenser if the processed data differs from the control data by a predetermined amount. The light may be selected from the group consisting of ultraviolet, visible, infrared, and microwave light. Other embodiments are described and claimed.
    Type: Application
    Filed: April 27, 2012
    Publication date: August 14, 2014
    Inventors: Kip P. Stevenson, Pooya Tadayon, Warren S. Crippen
  • Patent number: 8570512
    Abstract: Methods, storage mediums, and systems for correlating pulses generated from multiple interrogation regions in a flow cytometer to particular particles flowing through the flow cytometer are provided. Embodiments of the methods, storage mediums, and systems include configurations for calibrating a flow cytometer using a calibration particle having a unique signature to determine a time-of-flight for particles flowing through the flow cytometer. Based on the calculated time-of-flight and relative positions of interrogation regions corresponding to collectors of the flow cytometer, the methods, storage mediums, and systems may further include configurations for associating other signal pulses to particles of one or more different particle sets.
    Type: Grant
    Filed: April 3, 2012
    Date of Patent: October 29, 2013
    Assignee: Luminex Corporation
    Inventor: Adam Richard Schilffarth
  • Publication number: 20110169648
    Abstract: A sensing device able to do concurrent real time detection of different kinds of chemical, biomolecule agents, or biological cells and their respective concentrations using optical principles. The sensing system can be produced at a low cost (below$1.00) and in a small size (˜1 cm3). The novel sensing system may be of great value to many industries, for example, medical, forensics, and military. The fundamental principles of this novel invention may be implemented in many variations and combinations of techniques.
    Type: Application
    Filed: March 6, 2011
    Publication date: July 14, 2011
    Applicant: BANPIL PHOTONICS, INC.
    Inventors: Achyut Kumar Dutta, Rabi Sengupta
  • Patent number: 7805256
    Abstract: A method of processing time-discrete measured values, which can be described in their time characteristic by a first exponential function which has a first time constant, the method comprising the steps of: detecting a first measured value and storing the first measured value, detecting a second measured value and storing the second measured value according to a defined time interval with respect to the detection of the first measured value, filtering the first measured value and second measured value by calculating a sum of the first measured value and a weighted difference between the second measured value and the first measured value, thereby generating time-discrete output values which can be described in their time characteristic by a second exponential function having a second time constant different from the first time constant, and outputting the output values is disclosed.
    Type: Grant
    Filed: April 18, 2007
    Date of Patent: September 28, 2010
    Assignee: Vincotech (Germany) GmbH
    Inventor: Robert Frodl
  • Patent number: 6843102
    Abstract: A gas sensor configuration comprises a radiation-emitting radiation device, a gas measuring chamber, a detector unit and an evaluation device. A measuring gas that contains at least one gas component is present in the gas measuring chamber. The evaluation device detects the gas component and/or its concentration depending on the output signal of the detector unit. The radiation emitting device comprises at least one source that emits a measuring radiation and at least one reference radiation source, the latter being switched on periodically to measure the aging state of the source that emits the measuring radiation. The evaluation device detects the aging of the source that emits the measuring radiation on the basis of deviations with respect to the output signals of the detector unit when the reference radiation source and the source that emits the measuring radiation are switched on, and, if necessary, compensates for the aging.
    Type: Grant
    Filed: May 26, 2000
    Date of Patent: January 18, 2005
    Assignee: Gasbeetle GmbH
    Inventors: Aleksandr Shulga, Udo Schmale, Holger Müller
  • Publication number: 20030151009
    Abstract: Algorithm for filter selection of binary filters configured to solve the problem in question with the aim of determining smallest concentration changes in substance mixtures wherein one or a plurality of low-concentration lead components can be reliably detected in the presence of higher-concentration matrix or background components using the selected broad-band binary filters. The spectral power transmitted or reflected by the substance mixture is detected by a plurality of photosensitive detectors which are spectrally broad-banded and provided with binary filters, the detector signals being used for exact determination of the substance concentrations.
    Type: Application
    Filed: April 15, 2003
    Publication date: August 14, 2003
    Inventors: Bernd Eppich, Gerhard Mller
  • Patent number: 6359284
    Abstract: An apparatus including a sample holder which fixedly holds sample vessels arranged on a same arc, a partition plate, a light guide which is configured by optical fibers and which transmits fluorescent signals emitted from respective test samples, to an optical sensor, the single optical sensor, and a light source which generates excitation light. Fluorescent signal emission ends of the light guide are opposed to the optical sensor, and fluorescent signal incidence ends of the light guide are respectively opposed to the sample vessels via the partition plate therebetween. The partition plate includes an excitation light optical unit for selectively guiding the excitation light from the light source to only one of the sample vessels arranged on the arc, and a fluorescence optical unit for guiding only the fluorescent signal emitted from a selected one of the sample vessels to the light guide.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: March 19, 2002
    Assignee: Tosoh Corporation
    Inventors: Toshinori Hayashi, Takahiko Ishiguro
  • Patent number: 5506685
    Abstract: The invention provides a method consisting successively in producing two electromagnetic radiations of the same wavelength that is modulated as a function of time over a range of wavelengths, a "measurement" one of said radiations passing through a gas that presents selective absorption for said radiation in the range, while the other radiation constitutes a "reference" radiation. Each of said radiations is transformed into a respective "measurement" or "reference" electrical signal. The measurement signal is divided by the reference signal to obtain a first quotient electrical signal which is in turn split into two portions: a time-varying AC portion and a DC portion that does not vary with time. The AC portion is divided by said DC portion in order to obtain a second quotient electrical signal representative solely of the electromagnetic radiation absorbed by the gas.
    Type: Grant
    Filed: March 1, 1996
    Date of Patent: April 9, 1996
    Assignee: Schlumberger Industries, S.A.
    Inventor: Francois Grasdepot
  • Patent number: 5400664
    Abstract: In an automatic analyzer such as blood analyzer, it is important to observe whether the sample, such as a blood sample, is sucked correctly or not. In an apparatus for observing suction of a sample, comprising a sample suction tube, a luminous element for emitting light toward the sample suction tube being driven by a driving circuit, a photo sensor for receiving the light from the sample suction tube, and a judging circuit for judging the sample suction on the basis of the signal from the photo sensor, a controller is provided in order to drive the luminous element so that the output (Vp) of the photo sensor may be nearly the reference value (Vr) before a sample suction, and to drive the luminous element so as to hold the driving state during the sample suction. Thus, the sensitivity adjustment of the apparatus for observing suction of a sample may be automated, and the observing capability of the apparatus is enhanced.
    Type: Grant
    Filed: July 27, 1992
    Date of Patent: March 28, 1995
    Assignee: Toa Medical Electronics Co., Ltd.
    Inventor: Katsuhiko Kio
  • Patent number: 5294806
    Abstract: A particle detector that determines the presence of particles in an enclosed volume includes a laser that directs an optical beam to a beam splitter that produces first and second beams. An optical system directs the first beam into the enclosed volume. A detector is positioned adjacent the volume in order to receive back scattered optical energy arising from a particle in the volume encountering the first beam. The back scattered optical energy and the second beam are optically combined so as to overlap in a region and in the overlap region the back scattered optical energy and second beam are in the same state of focus, of the same polarization and are substantially parallel. A detector located at the overlap region produces an electrical signal indicative of the intensity of the back scattered light. A signal processor analyzes the electrical signal to determine the presence of the particle.
    Type: Grant
    Filed: February 12, 1993
    Date of Patent: March 15, 1994
    Assignee: International Business Machines Corporation
    Inventors: John S. Batchelder, Donald M. DeCain, Philip C. D. Hobbs
  • Patent number: 5237857
    Abstract: The probe (20) includes a conductivity sensor (38) and an optical sensor (39) for detecting the depth of a layer of oil, gasoline, etc floating on the surface of water in a well. A battery (60) is included in the probe, and a resistor (R1) is provided in series with the conductivity sensor. When the probe is in oil, both sensors are OFF, and no voltage is detectable at the surface; when the probe is in air, the optical sensor is ON and the conductivity sensor is OFF, so that a maximum voltage is detectable at the surface; and when the probe is in water, the optical sensor is OFF and the conductivity sensor (with its resistor) is ON, so that an intermediate voltage, as set by the value of the resistor, is detectable at the surface.
    Type: Grant
    Filed: February 23, 1990
    Date of Patent: August 24, 1993
    Assignee: Solinst Canada Limited
    Inventors: Andrew R. Dobson, Richard J. Belshaw, Douglas J. Belshaw
  • Patent number: 5206519
    Abstract: The Rolling Average Rate Read Indicator and Method detects the presence of a particular constituent in either a solid, liquid or gas and returns a rapid and accurate measurement of the concentration of the constituent. The Indicator is comprised of a sensor (12) containing a stepper motor (36) driven tape impregnated with a chemical substance reactive to a particular constituent. Discoloration of the tape occurs in the presence of the constituent and this discoloration is converted to an electrical signal which is indicative of the rate of change in the chemical reaction taking place and is linear for some portion of time. The signal is differentiated (16) and the resultant differentiated signal is indicative of the arithmetic mean of a plurality of instantaneous values taken at intervals during the linear portion of the reaction. The extent of the reaction as evidenced by the level of the sensor output signal is continuously monitored and compared (26) to a known value.
    Type: Grant
    Filed: March 9, 1992
    Date of Patent: April 27, 1993
    Assignee: Galvanic Analytical Systems Ltd.
    Inventor: David Kirk
  • Patent number: 5156012
    Abstract: An air conditioning system having a circuit for determining whether sufficient refrigerant is present in the system by detecting a phase state of the refrigerant. The circuit comprises a comparison circuit for comparing a detection signal of a state detecting sensor with a first reference value and a second reference value lower than the first reference value. An indication signal is output after the detection signal exceeds the first reference value until the detection signal is less than the second reference value. When the amount of refrigerant in the system is proper, even if the detection signal varies due to translucent lubricating oil in the refrigerant, the indication signal is continued to be output unless the detection signal drops below the second reference value. The amount of refrigerant in the refrigerant circuit can be accurately determined and maintained within a proper range.
    Type: Grant
    Filed: December 17, 1991
    Date of Patent: October 20, 1992
    Assignees: Sanden Corporation, Japan Electronic Control Systems Company, Ltd.
    Inventors: Masaru Kuribara, Kazumitsu Kobayashi, Syunji Komatsu
  • Patent number: 5132096
    Abstract: Analyzing the level of a treating agent and/or stress metals in a body of water containing an inert transition metal tracer added to the water proportionally with the treating agent by determining the absorbance (first absorbance value) of a reagent dye added to water, said dye producing a second absorbance value when reacted at the same concentration with the tracer and stress metals in a measure of said body of water, and said dye producing a third absorbance value when reacted at the same concentration with only the transition metal contained in a measure of said body of water; determining the second and third absorbance values and resolving their differences to determine the concentration of the tracer and, separately, the concentration of said stress metals.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: July 21, 1992
    Assignee: Nalco Chemical Company
    Inventors: John E. Hoots, Rodney H. Banks
  • Patent number: 5092677
    Abstract: An apparatus and method for making a photometric determination regarding the contents of a sample, such as the absorbance characteristic of a blood serum sample. The improvement allows measurements to be taken after a reduced warm-up period and compensates for variations in the lamp intensity during the period over which measurements are taken. A feedback circuit is provided between a reference photodetector and the light source for causing the light source intensity to asymptotically approach a final stable value in a smooth exponential curve. Signal processing means processes outputs of the reference and sample photodetectors taken at different times so as to compensate for variations in the source intensity over the time period during which the outputs are taken. Still further, the photometer allows resonant frequency mixing of the contents of a cuvette while disposed in the photometer by causing the entire optical assembly, in which the cuvette is mounted, to vibrate at its resonant frequency.
    Type: Grant
    Filed: August 2, 1989
    Date of Patent: March 3, 1992
    Assignee: Artel, Inc.
    Inventor: Richard Curtis
  • Patent number: 5083036
    Abstract: An indicator circuit is provided for an apparatus that measures the concentration of a selected component in a test sample. The apparatus generates a test voltage that represents the concentration of the component in the test sample. The circuit generates a series of range voltages, each of which represents a respective one of a series of potential concentration ranges of the component in the test sample. A switching circuit selects an adjacent pair of range voltages immediately above and below the test voltage and applies the selected range voltages across an incremental voltage divider such that the voltage difference of the selected range voltages is divided into a series of incremental voltages, each of which represents a respective one of a series of potential incremental concentration levels of the component within each concentration range.
    Type: Grant
    Filed: January 15, 1991
    Date of Patent: January 21, 1992
    Assignee: HF Scientific, Inc.
    Inventor: Howard L. Beers
  • Patent number: 5053623
    Abstract: A photometric analyzer for measuring differential total reduced sulfur in a sample gas stream is provided. It includes a supply for a sulfur bearing gas sample, an oven having an inlet connected to the supply for converting TRS to SO.sub.2 and an outlet through which the gas sample is discharged. A valve is connected to the outlet of the oven. An SO.sub.2 bypass line is connected between the supply and the valve. A sample cell with transparent ends has an inlet adjacent one end connected to the valve for alternately receiving sample gas from either the oven or the bypass line and has an outlet adjacent the other end. A pump connected to the sample cell outlet draws the gas sample through the sample cell. A light source at the one end of the sample cell directs light of a predetermined wave length through the sample cell. A light sensing device at the other end detects the amount of light passing through the sample cell at any given time and provides an output signal to an analyzer.
    Type: Grant
    Filed: July 2, 1990
    Date of Patent: October 1, 1991
    Assignee: Lear Siegler Measurement Controls Corporation
    Inventors: Gerald F. McGowan, Ronald L. Ketchum, Allan L. Budd
  • Patent number: 4908676
    Abstract: The present invention comprises a simple multi-purpose on-line system for monitoring the concentration and/or the total amount of an organic analyte species or inorganic analyte species in an aqueous solution. The on-line detection system comprises a detection column and a sensor mounted around the detection column. The sensor consists of an electromagnetic radiation source (typically a light source) and an appropriate detector for the electromagnetic radiation. The response from the detector drives an electric circuit, which provides a signal to a recorder as well as a means to trip an alarm system and/or a process system.
    Type: Grant
    Filed: December 18, 1987
    Date of Patent: March 13, 1990
    Assignee: Bio-Recovery Systems, Inc.
    Inventors: Glenn W. Bedell, Benjamin Greene, Marion Davis, Floyd J. Abbott
  • Patent number: 4848904
    Abstract: The present invention relates to an improved dual beam multichannel spectrophotomer employing a simple and novel optical system in combination with photodiode arrays and a unique logrithmic data converter to convert light signals to absorbance. In particular, the optical system utilizes optical elements in a novel arrangement to direct a pair of equivalent sample and reference beams in an essentially parallel formation respectively through a sample and reference cell and to focus and direct the emergent sample and reference beams to a single flat horizontally ruled grating which disperses each of the sample and reference beams respectively onto a pair of vertically disposed photodiode arrays whereby the light signals are converted into absorbance units (AU) by an unique logarithmic data converter. The spectrophotometer is highly accurate, has very low drift, less than 2.times.10.sup.-4 AU/.degree.C., and very low noise, less than .+-.2.times.10.sup.-5 AU.
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: July 18, 1989
    Assignee: Applied Biosystems Inc.
    Inventors: Edwin R. Sapp, Eric K. Kinast
  • Patent number: 4759631
    Abstract: A system for transmission loss comparison permits enhanced accuracy over a wider dynamic range by providing a reference channel including a transmitter, receiver, and transmission path therebetween, and a sample channel, including a transmitter, receiver, and transmission path therebetween. A feedback arrangement is provided for adjusting the outputs of both of the reference and sample transmitters in relation to the signal output of the reference receiver, so as to produce a desired signal level of the reference receiver's output over a given dynamic range, so as to compensate for loss over the reference transmission path. In this way, a comparator connected to the outputs of the two receivers receives inputs that are compensated for effects of losses over the reference transmission path.
    Type: Grant
    Filed: September 29, 1986
    Date of Patent: July 26, 1988
    Assignee: Circuits and Systems, Inc.
    Inventor: Drew E. Sunstein
  • Patent number: 4757306
    Abstract: A separation type light blocking smoke detector detects smoke present between a light emitting section and a light receiving section spaced therefrom by detecting blocking of light between the light emitting section and the light receiving section. The detector includes a light emitting section driving circuit, a counting circuit, and a storage circuit. The light emitting section driving circuit changes the emission intensity of the light emitting section in accordance with a predetermined changing mode for every repetitive cycle. The counting circuit includes a first comparator and an updating signal generator, and counts a physical amount corresponding to a period during which an output from the light emitting section falls in a predetermined range for each repetitive changing cycle. The storage circuit includes a second comparator and an AND gate, and stores a count value of the counting circuit in an arbitrary repetitive cycle.
    Type: Grant
    Filed: January 8, 1987
    Date of Patent: July 12, 1988
    Assignee: Nittan Co., Ltd.
    Inventor: Tetsuo Kimura
  • Patent number: 4707133
    Abstract: A system for measuring the density of certain ions or neutrals within a plasma without probe intervention. When cylindrical symmetry is present, the system also provides measurement of spatial distribution of excited ionic states within the plasma. The system allows spatial distribution of contaminant ions in magnetic confinement thermonuclear fusion devices to be monitored. These functions are accomplished by directing two laser beams through a region containing a plasma. The laser means are at respective wavelengths chosen to be in and closely adjacent to a spectral region near the electronic transition frequency of the ionic species of interest in the plasma. The intensities of the two wavelengths are then measured and compared to obtain the desired data and characterization.
    Type: Grant
    Filed: March 6, 1986
    Date of Patent: November 17, 1987
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Thomas G. Roberts, Raymond W. Conrad, Thomas E. Honeycutt
  • Patent number: 4651013
    Abstract: A smoke detector comprising a light emitting section from which pulse light is radiated to a detection area with a predetermined period and a light receiving section which is disposed so as to be opposite to the light emitting section to receive the light for detecting a change caused in the detection area in the form of a change in photo-output level. The light receiving section has a monitor terminal for outputting a monitor signal corresponding to the photo-output level. When a measuring apparatus is externally connected to the monitor terminal, the supervision period is shortened as compared with the normal supervision period, so as to enable the monitor signal to be supervised substantially in real time, thereby facilitating an adjusting operation.
    Type: Grant
    Filed: February 20, 1985
    Date of Patent: March 17, 1987
    Assignee: Hochiki Corporation
    Inventors: Shigeru Kajii, Hiroshi Honma, Junichi Narumiya
  • Patent number: 4638304
    Abstract: An environmental abnormality detecting apparatus for detecting abnormality in atmosphere such as heat, smoke, and a gas. A sampling circuit is provided for periodically sampling analog signals from a detector for detecting these phenomena. A quantizer quantizes sampled signals with step levels. An accumulator having a plurality of counters provides different accumulation times corresponding to the step levels. Reliability in accumulation effect is not degraded, and an abnormality signal can be detected in a short period of time when a degree of abnormality is high.
    Type: Grant
    Filed: December 12, 1984
    Date of Patent: January 20, 1987
    Assignee: Nittan Co., Ltd.
    Inventors: Tetsuo Kimura, Seiichi Tanaka, Takasi Suzuki
  • Patent number: 4637730
    Abstract: This invention relates to an optical absorptiometer which is characterized by a light source unit of a broad wavelength having a source of constant energy which is collimated into two light beams, one of which is transmitted through the liquid to be measured, and another beam which is transmitted through a conductor and acts as a reference beam, and a detector unit which contains two photocells, one photocell for measuring the beam transmitted through the liquid to be measured, and another photocell which measures the reference beam, a position in the absorptiometer for optically placing the liquid to be measured between the source unit and the detector unit, and means for measuring the energy difference between the light beams of the measured liquid and the reference beams in terms of absorbance, and means for converting this result to an electrical signal.
    Type: Grant
    Filed: September 18, 1984
    Date of Patent: January 20, 1987
    Assignee: Custom Sample Systems, Inc.
    Inventors: Michael J. Ponstingl, Walter N. Trump, Robert C. Kessler
  • Patent number: 4586026
    Abstract: The percentage gas concentration within a sample as measured in a conventional optical bench is derived from the composite signal of the reference beam and sample beam transmitted through a sample cell in the optical bench. The primary source, which generates the reference beam and the secondary source which generates the sample beam are driven ninety degrees out of phase. The composite signal derived from the detector in the optical bench is digitized and then integrated according to the quadrature of the primary component of the composite signal derived from the reference beam, and is also integrated according to the quadrature of the secondary component of the composite signal derived from the sample beam. What is obtained is the integral of the absolute value of the secondary component and the integral of the absolute value of the primary component of the composite signal over one cycle of the reference beam and sample beam.
    Type: Grant
    Filed: November 7, 1983
    Date of Patent: April 29, 1986
    Assignee: Liston Edwards, Inc.
    Inventors: James R. Braig, Max D. Liston
  • Patent number: 4579253
    Abstract: An improved toner control system having a pair of matched photosensitive devices connected in series and receiving equal amounts of light, wherein one device responds to light transmitted through the toner-containing developer and the other device responds to light transmitted through an adjustable aperture or attenuator.
    Type: Grant
    Filed: August 27, 1981
    Date of Patent: April 1, 1986
    Assignee: Savin Corporation
    Inventor: Richard S. Shenier
  • Patent number: 4559453
    Abstract: In a line extinction detector using a pulse-operated radiation source, a radiation receiver is connected to an input amplifier of an evaluation circuit. The output pulses generated by the input amplifier are compared to a reference voltage. Circuit elements having a time constant above one minute are provided to adjust either one of the voltage of the output pulses or the reference voltage such that their difference practically becomes zero. The output pulses of the input amplifier are further compared to an alarm threshold derived from the reference voltage and an alarm is triggered when the output signal falls below the alarm threshold value. The output pulses of the input amplifier are also compared to a disturbance threshold value and a disturbance signal is generated when the output signal drops below the disturbance threshold value.
    Type: Grant
    Filed: May 5, 1983
    Date of Patent: December 17, 1985
    Assignee: Cerberus AG
    Inventors: Jurg Muggli, Martin Labhart
  • Patent number: 4555634
    Abstract: A smoke detector is disclosed having a radiation source operated in a pulsed mode. Externally of a direct radiation region of the radiation source there is arranged a radiation receiver which, in the presence of smoke or other particles emanating from a combustion process and located in the radiation region, is impinged by scattered radiation and delivers an output signal to an evaluation circuit. The evaluation circuit contains switching elements which, when the number of source output signals or pulses exceeds a predetermined threshold value for the number of source output pulses, delivers an alarm signal. Near to the radiation receiver there is arranged a reference cell in the direct radiation beam of the radiation source, this reference cell controlling the emission of radiation by the radiation source.
    Type: Grant
    Filed: November 3, 1982
    Date of Patent: November 26, 1985
    Assignee: Cerberus AG
    Inventors: Jurg Muggli, Heinz Guttinger, Zoltan Horvath
  • Patent number: 4547675
    Abstract: A smoke detector contains two radiation transmitters and two radiation receivers. Each of the radiation transmitters emits in a different spectral region, for instance, one emits above and the other one below 600 nm. One part of the radiation of both radiation transmitters is conducted via a measuring path, which is accessible to smoke, to one of the receivers constituting a measuring radiation receiver, and another part of such radiation is conducted via a comparison path, which is not accessible to smoke, to the other of the receivers constituting a comparison radiation receiver.
    Type: Grant
    Filed: December 7, 1981
    Date of Patent: October 15, 1985
    Assignee: Cerberus AG
    Inventors: Jurg Muggli, Martin Labhart
  • Patent number: 4537510
    Abstract: Apparatus for controlling output signals from two light detectors in a photometer. The sensitivities of the light detectors, or the gains in amplifiers for amplifying output signals from the light detectors are controlled in such a manner that the sensitivity characteristics and output characteristics of the two light detectors are in agreement with one another, to thereby improve the measuring accuracy thereof.
    Type: Grant
    Filed: December 9, 1982
    Date of Patent: August 27, 1985
    Assignee: Hitachi, Ltd.
    Inventor: Kenichiro Takahasi
  • Patent number: 4525069
    Abstract: An optical absorption analyzer for determining the concentration of low concentration components of a sample gas. Inexpensive voltage to frequency converters, up/down counters, and integrators are used to obtain a high accuracy determination which is independent of fluctuations in the strength of the light source used in the analyzer.
    Type: Grant
    Filed: April 23, 1982
    Date of Patent: June 25, 1985
    Assignee: Horiba, Ltd.
    Inventors: Masaru Tanaka, Naoki Noguchi, Kenji Yoshino, Osamu Saitoh
  • Patent number: 4420256
    Abstract: A method for measuring substantially spherical particles, such as dust. Two signals are formed, one of which is an approximately linear function of the particle concentration independently of the particle diameter and the second one is an approximately linear function of the particle diameter independently of the particle concentration. In order to obtain these signals the particles are illuminated with light in a direction different from their direction of flow. At least two detectors are arranged in such a way that the light in the beam path from the light source (3) to the first detector (6) is substantially only influenced by scattering and by light absorption of the particles and that the light in the beam path from the light source to the second detector (7) passes substantially only via reflections against the particles. The two signals are formed by definite relations between the d.c. voltage components of the output signals of the detectors and the average value of the squared R.M.S. value of the a.
    Type: Grant
    Filed: February 12, 1981
    Date of Patent: December 13, 1983
    Assignee: Svenska Traforskningsinstitutet
    Inventors: Gerdt Fladda, Thorulf Pettersson
  • Patent number: 4374322
    Abstract: The temperature of the dye bath in a vat or trough (1) is controlled in dependence on absorption change, which is photometrically sensed. A command value of dye acceptance speed related to temperature of the dye within the vat is provided, compared with actual temperature, and a control signal is derived which, in turn, controls a heat exchanger supplied, selectively, with a heating or cooling medium in order to control dye acceptance of at least one predetermined dye component of the bath by the material therein.
    Type: Grant
    Filed: April 24, 1980
    Date of Patent: February 15, 1983
    Assignee: W. C. Heraeus GmbH
    Inventors: Erich Hoffmann, Werner Ptaschek
  • Patent number: 4367041
    Abstract: A chromatograph detection system for differentiating pure components of a chromatogram for accurate measurement or collection of such components. The light beam passing through a single detector flow cell is split and absorbance is detected at two differing wavelengths. Undesirable overlapping components are eliminated by scaling the chromatogram at one wavelength to equal the chromatogram at the other wavelength, and then subtracting the chromatograms. Purity of component substances is determined by continuously dividing the chromatogram signals to determine the absorbance ratio and its characteristics over time.
    Type: Grant
    Filed: August 25, 1980
    Date of Patent: January 4, 1983
    Assignee: Micromeritics Instrument Corporation
    Inventors: Paul A. Webb, Jr., Alan H. Small, Dean M. Ball
  • Patent number: 4352553
    Abstract: The present invention concerns copying apparatus which automatically controls the quality of copies. The copying apparatus includes a density detector for detecting the frequency of occurrence of density values along a scanning line of a document to be copied, i.e., the frequency distribution of density values is determined. When the frequency distribution has at least three maxima, a smoothing device smooths the frequency distribution via a predetermined filter function till the frequency distribution has one or two maxima. In the event the frequency distribution has one or two maxima, a density detecting device detects at least one density value according to a maximum or minimum value of the frequency distribution. A control device then controls the copy quality of a reproduced image according to the density value.
    Type: Grant
    Filed: December 15, 1980
    Date of Patent: October 5, 1982
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Shuzo Hirahara