With Plural Light Detectors (e.g., Photocells) Patents (Class 356/411)
  • Patent number: 9664653
    Abstract: The invention relates to a method for feeding a sample into an analysis branch of a liquid chromatography system, in particular a high-performance liquid chromatography system. A solvent or a solvent mixture from at least one solvent branch is supplied as volume flow {dot over (A)} into the analysis branch. At least one sample from at least one sample branch is fed as volume flow ? into the analysis branch within a predetermined time interval. The volume flow {dot over (A)} is reduced to an extent during the predetermined time interval, and a volume flow ? resulting from the sum of the volume flows {dot over (A)} and ? remains substantially constant in the analysis branch. The invention further relates to a sampler for carrying out a method of this kind.
    Type: Grant
    Filed: February 10, 2015
    Date of Patent: May 30, 2017
    Assignee: DIONEX SOFTRON GMBH
    Inventor: Hermann Hochgraeber
  • Patent number: 8947669
    Abstract: A gas detector including: an assembly of two coaxial parabolic reflective caps having opposite concavities, and a wafer arranged in the focal plane of the two caps, at the center of this focal plane, comprising, back-to-back: a diverging light emitter directed towards the first cap and a light receiver directed towards the second cap, wherein the two caps are distant substantially by the sum of their focal distances plus the thickness of the wafer.
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: February 3, 2015
    Assignee: Commissariat à l'Energie Atomique et aux Energies Alternatives
    Inventors: Sergio Nicoletti, Pierre Barritault, Mickaël Brun
  • Patent number: 8603772
    Abstract: This invention provides a novel methods and devices for measurement of particle concentration or changes in particle concentration over a wide linear range. The invention comprises one or more radiation sources and one or more detectors contained in a housing which is interfaced to a medium containing particulate matter. The one or more radiation sources are directed into the medium, scattered or transmitted by the particulate matter, and then some portion of the radiation is detected by the one or more detectors. Methods for confining the measurement to a specific volume within the medium are described. Algorithms are provided for combining the signals generated by multiple source-detector pairs in a manner that results in a wide linear range of response to changes in particle concentration. In one embodiment the sensor provides non-invasive measurements of biomass in a bioreactor. In another embodiment an immersible probe design is described, which may be suited for one-time use.
    Type: Grant
    Filed: July 28, 2008
    Date of Patent: December 10, 2013
    Assignee: Bug Lab LLC
    Inventors: Martin P. Debreczeny, Jaime Romero, Ethan Petersen
  • Patent number: 8416414
    Abstract: A system (10) for multispectral imaging includes a first optical filter (24, 20) having at least two passbands disposed in different spatial positions on the first optical filter, a second optical filter (20, 24) having another at least two passbands, and processor (32) adapted to identify an intensity of light in the at least two passband of the second optical filter.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: April 9, 2013
    Inventor: George Themelis
  • Patent number: 8368891
    Abstract: A method of using a sensor array that measures the long-term change in the organic content of the near-surface seawater by simultaneously comparing downwelling sunlight attenuation in the blue and green wavelengths over a significant vertical distance.
    Type: Grant
    Filed: May 5, 2010
    Date of Patent: February 5, 2013
    Inventors: William Thomas Reynolds, Burton Harold Jones
  • Patent number: 8339607
    Abstract: An apparatus and method provide measurement of a constituent of a fluid, such as ozone in ozonated water. The apparatus includes a vessel to contain the fluid, a light source configured to direct a first band of light and a second band of light along a substantially shared path though the fluid, and a photosensor that senses the first band of light and the second band of light. The constituent has a greater absorption associated with the first band of light than with the second band of light. The method includes modification of a measured attribute of the component in response to the sensed second band of light to improve the accuracy of the measured attribute.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: December 25, 2012
    Assignee: MKS Instruments, Inc.
    Inventors: Stephan Levine, Johannes Seiwert, Joachim Lohr, Ulrich Brammer, Jens Fittkau
  • Patent number: 8274657
    Abstract: A radiation detector is disclosed with a detector arrangement, which has a plurality of detector elements, by means of which a detector signal is obtained during operation of the radiation detector, and with a control device, wherein the detector elements each have a spectral sensitivity distribution, and are suited for generating signals, at least one detector element comprises a compound semiconductor material, and this detector element is designed for detecting radiation in the visible spectral region, the radiation detector is designed such that the sensitivity distributions of the detector elements are used to form different spectral sensitivity channels of the radiation detector, a channel signal assigned to the respective sensitivity channel can be generated in these sensitivity channels using the detector elements, and the control device is designed such that the contributions of different channel signals to the detector signal of the radiation detector are differently controlled.
    Type: Grant
    Filed: November 29, 2007
    Date of Patent: September 25, 2012
    Assignee: OSRAM Opto Semiconductors GmbH
    Inventors: Arndt Jaeger, Peter Stauss, Klaus Streubel, Werner Kuhlmann
  • Patent number: 8128237
    Abstract: A computer implemented method for utilizing a plurality of self-activating display shaping devices to provide shape adjustment information for a digital image projected on a display is disclosed. In one embodiment, the plurality of display shaping devices are automatically activated, the plurality of display shaping devices defining a desired digital image shape for a display. In addition, the plurality of display shaping devices is utilized to identify an actual projected digital image shape. The actual projected digital image shape is then compared with the desired digital image shape for the display. Correction information is then provided for adjusting the actual projected digital image shape to approximate the desired digital image shape for the display.
    Type: Grant
    Filed: July 27, 2007
    Date of Patent: March 6, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Robert L. Cobene, Jeffrey M. DiCarlo, Glen E. Montgomery
  • Patent number: 8119068
    Abstract: A fluid content monitor including a cuvette, a colorimeter adapted to generate a signal indicative of contents of a fluid sample contained in the cuvette, a container for holding a reagent, and a pump assembly for delivering reagent from the container to the cuvette. The pump assembly includes a tube extending from the container to the cuvette, check valves preventing reverse flow in the tube, and a hammer driven by a solenoid for repetitively compressing the tube to pump reagent to the cuvette. The cuvette can be removed for cleaning and replacement.
    Type: Grant
    Filed: July 28, 2010
    Date of Patent: February 21, 2012
    Assignee: HF Scientific, Inc.
    Inventors: Rowan Connelly, Joel Leal
  • Patent number: 8085401
    Abstract: An apparatus and method provide measurement of a constituent of a fluid, such as ozone in ozonated water. The apparatus includes a vessel to contain the fluid, a light source configured to direct a first band of light and a second band of light along a substantially shared path though the fluid, and a photosensor that senses the first band of light and the second band of light. The constituent has a greater absorption associated with the first band of light than with the second band of light. The method includes modification of a measured attribute of the component in response to the sensed second band of light to improve the accuracy of the measured attribute.
    Type: Grant
    Filed: March 3, 2009
    Date of Patent: December 27, 2011
    Assignee: MKS Instruments, Inc.
    Inventors: Stephan Levine, Johannes Seiwert, Joachim Lohr, Ulrich Brammer, Jens Fittkau
  • Patent number: 8081311
    Abstract: A system (10) for multispectral imaging includes a first optical filter (24) having at least two passbands disposed in different spatial positions on the first optical filter, a second optical filter (20) having another at least two passbands, and processor (32) adapted to identify an intensity of light in the at least two passband of the second optical filter (20).
    Type: Grant
    Filed: November 2, 2006
    Date of Patent: December 20, 2011
    Assignee: General Hospital Corporation
    Inventor: George Themelis
  • Patent number: 7791728
    Abstract: A microfluidic analysis system for optically analyzing a substance includes a light source having a plurality of selectable single-wavelength light sources, a substance presentation member optically coupled to the light source, and an optical detection system associated with the substance presentation member.
    Type: Grant
    Filed: August 11, 2005
    Date of Patent: September 7, 2010
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Christopher C. Beatty, Philip Harding, Christie Dudenhoefer, Charles Otis
  • Patent number: 7615730
    Abstract: A wavelength meter, an associated method, and system are generally described. In one example, an apparatus includes a photodiode to receive an optical signal and to generate a photocurrent upon receiving the optical signal, the photodiode having an absorption edge that is substantially aligned with a band of wavelengths, wherein the absorption edge shifts toward longer wavelengths when a reverse bias is applied to the photodiode, and control electronics coupled with the photodiode to apply at least a first reverse bias and a second reverse bias to the photodiode, wherein a ratio of a first measurement of the photocurrent at the first reverse bias and a second measurement of the photocurrent at the second reverse bias provides information about the wavelength of the optical signal.
    Type: Grant
    Filed: November 30, 2007
    Date of Patent: November 10, 2009
    Assignee: Intel Corporation
    Inventors: Sergei Sochava, John Hutchinson
  • Patent number: 7561271
    Abstract: A low cost calorimeter wherein a linear taper potentiometer proportions the current through sample and reference solid state light sources in a near logarithmic fashion. The position of the potentiometer slider is proportional to the absorbance of the solution in the sample path when the light intensity of the two paths is balanced. The light intensity may be balanced visually or with a simple electronic comparator.
    Type: Grant
    Filed: November 1, 2007
    Date of Patent: July 14, 2009
    Inventor: James E. Davis
  • Patent number: 7479625
    Abstract: A fluidic structure includes a channel and along the channel is a series of sensing components to obtain information about objects traveling within the channel, such as droplets or other objects carried by fluid. At least one sensing component includes a set of cells of a photosensor array. The set of cells photosense a range of photon energies that emanate from objects, and include a subset of cells that photosense within subranges. A processor can receive information about objects from the sensing components and use it to obtain spectral information. The processor can perform an initial analysis using information from one set of sensing components and, based on the results, control a fluidic device in the channel, such as a gate, to retain objects, such as for concentration and more detailed analysis by other sensing components, or to purge objects from the channel.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: January 20, 2009
    Assignee: Palo Alto Research Center, Incorporated
    Inventors: Peter Kiesel, Meng H. Lean, Oliver Schmidt, Armin R. Volkel, Noble M. Johnson
  • Patent number: 7468796
    Abstract: An absorption detection system is provided. The system includes a plurality of monochromatic light sources and a separator for separating the light from the plurality of monochromatic light sources into a plurality of wavelengths. A plurality of detectors, receives light of a single wavelength to measure absorption of light in a biological sample.
    Type: Grant
    Filed: August 8, 2005
    Date of Patent: December 23, 2008
    Assignee: CompuCyte Corporation
    Inventors: Edgar A. Luther, Bruce Miller
  • Patent number: 7414724
    Abstract: An apparatus for photometrically testing several specimens each irradiated by a light source, the light altered by the specimens being detected by an optical device and analyzed, the apparatus including a light source, a plurality of sample holders configured adjacent to one another on a support, a detector that receives altered light from sample within the sample holders, the detector including a filter for eliminating interfering light, a sensor having a sensor face and a diffusing optical member located between the filter and the sensor, wherein light is diffused and shines on a greater portion of the sensor surface, and with a more homogeneous brightness as compared to when the light is not diffused.
    Type: Grant
    Filed: November 17, 2006
    Date of Patent: August 19, 2008
    Assignee: Eppendorf AG
    Inventors: Gerd Eckert, Lutz Timmann, Markus Lapczyna, Arne Schafrinski
  • Patent number: 7358476
    Abstract: A fluidic structure includes a channel and along the channel is a series of sensing components to obtain information about objects traveling within the channel, such as droplets or other objects carried by fluid. At least one sensing component includes a set of cells of a photosensor array. The set of cells photosense a range of photon energies that emanate from objects, and include a subset of cells that photosense within subranges. A processor can receive information about objects from the sensing components and use it to obtain spectral information. The processor can perform an initial analysis using information from one set of sensing components and, based on the results, control a fluidic device in the channel, such as a gate, to retain objects, such as for concentration and more detailed analysis by other sensing components, or to purge objects from the channel.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: April 15, 2008
    Assignee: Palo Alto Research Center Incorporated
    Inventors: Peter Kiesel, Meng H. Lean, Oliver Schmidt, Armin R. Völkel, Noble M. Johnson
  • Patent number: 7291824
    Abstract: An integrated circuit (IC) includes a photosensor array, some cells of which are reference cells that photosense throughout an application's energy range, while other cells of which are subrange cells that photosense within respective subranges. For example, the subrange cells can receive photons in their respective subranges from a transmission structure that has laterally varying properties, such as due to varying optical thickness. The reference cells may be uncoated or may also receive photons through a transmission structure such as a gray filter. Subrange cells and reference cells may be paired in adjacent lines across the array, such as rows. Where photon emanation can vary along a path, quantities of incident photons photosensed by subrange cells along the path can be adjusted based on quantities photosensed by their paired reference cells, such as with normalization.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: November 6, 2007
    Assignee: Palo Alto Research Center Incorporated
    Inventors: Peter Kiesel, Oliver Schmidt, Oliver Wolst
  • Patent number: 7218656
    Abstract: In one exemplary embodiment, apparatus is provided with a plurality of laser diodes, sensing means and control means. During normal operation, the laser diodes produce a mixed light. The sensing means measures light that is output by the laser diodes; and the control means 1) compares the measured light to a spectral reference, and 2) sets drive signals of the laser diodes in response to the comparison. In a related and exemplary method, 1) a mixed light is produced using a plurality of laser diodes of different colors, 2) a measurement of light produced by the laser diodes is compared to a spectral reference, and 3) drive signals of the laser diodes are automatically set in response to the comparison.
    Type: Grant
    Filed: May 26, 2004
    Date of Patent: May 15, 2007
    Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.
    Inventor: Ken A. Nishimura
  • Patent number: 6657718
    Abstract: A liquid measuring cell for measuring optical properties of liquids, with a measuring chamber (16), which is adjoined on one side by a transparent window (11), and with a reflector (30) disposed on the opposite side of the measuring chamber (16), which reflects the light striking it toward the outside through the measuring chamber (16) and the window (11), is particularly easy to clean and permits favorably reproducible measurements if another transparent window (33) is disposed between the reflector (30) and the measuring chamber (16) and this window (33) adjoins the measuring chamber (16) on the other side.
    Type: Grant
    Filed: August 22, 2000
    Date of Patent: December 2, 2003
    Assignee: Bran + Luebbe GmbH
    Inventors: Karl Petersen, Ludger Middelberg
  • Publication number: 20030156290
    Abstract: An optical sensor device for determining the presence or concentration of an analyte, contains a waveguide disposed over a light source and a light detector mounted on a surface of a substrate and separated by an internal baffle, wherein the waveguide has a thickness corresponding to a far field emission point of the light source as determined by a light shielding baffle between the light source and light detector. An analyte indicator matrix is disposed on the outer surface of the waveguide. The sensor device geometry takes advantage of only direct illumination of the indicator matrix, and direct collection of indicator matrix illumination, without any significant reflection by said waveguide. Undesirable light noise generated by the light source passes directly out of the device through the waveguide.
    Type: Application
    Filed: December 11, 2002
    Publication date: August 21, 2003
    Inventors: Arthur E. Colvin, Steven J. Walters
  • Publication number: 20030048445
    Abstract: A multichannel fluorosensor includes an optical module and an electronic module combined in a watertight housing with an underwater connector. The fluorosensor has an integral calibrator for periodical sensitivity validation of the fluorosensor. The optical module has one or several excitation channels and one or several emission channels that use a mutual focusing system. To increase efficiency, the excitation and emission channels each have a micro-collimator made with one or more ball lenses. Each excitation channel has a light emitting diode and an optical filter. Each emission channel has a photodiode with a preamplifier and an optical filter. The electronic module connects directly to the optical module and includes a lock-in amplifier, a power supply and a controller with an A/D converter and a connector. The calibrator provides a response proportional to the excitation intensity, and matches with spectral parameter of fluorescence for the analyzed fluorescent substance.
    Type: Application
    Filed: September 12, 2002
    Publication date: March 13, 2003
    Inventors: Eugene Tokhtuev, Anatoly Skirda, Viktor Slobodyan, Christopher Owen
  • Patent number: 6486957
    Abstract: An instrument for processing light information to assay chemical or biological molecules is made more flexible by the use of a replaceable filter module. Several light filters, or in one embodiment dichroic mirrors, are mounted in a common module in fixed position relative to each other. The whole filter module can then be removed, and a different one inserted in its place, to change the wavelength bands of light detected by the instrument, as needed, for different applications.
    Type: Grant
    Filed: September 15, 1999
    Date of Patent: November 26, 2002
    Assignee: GeneSys Technologies, Inc.
    Inventors: David W. Braumann, Patrick J. Saunders, John A. Luckey, Robert L. Brumley, Jr.
  • Patent number: 6398914
    Abstract: In the production of de-inked pulp, measuring devices are used to register spectral and/or physical characteristic values of a starting material. These values are then fed to a neural network, by means of which correction variables are obtained for a regulating or controlling device which in provided. According to the invention, the measuring device is used to evaluate at least the starting materials of the production of pulp and/or paper. The evaluation of the characteristics of the raw material used in the production of pulp and paper is thereby possible.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: June 4, 2002
    Assignee: Siemens Aktiengesellschaft
    Inventor: Herbert Furumoto
  • Patent number: 6362887
    Abstract: A device is described for measuring changes in parameters in transparent objects, in particular for medical applications. For universal use in various applications, the device includes a light source, an optical line sensor which detects the intensity of the light of the light source passing through the object as a function of location in at least one extension direction of the object, and a computer unit which compares the distribution of the light intensities detected by the optical line sensor as a function of location with at least one predetermined reference distribution. According to another embodiment, the light source supplies approximately parallel light, and the computer unit shapes the first derivation according to location of the distribution of the light intensities detected by the optical line sensor. The device is designed so that the different light sources can be easily replaced or combined.
    Type: Grant
    Filed: June 8, 1999
    Date of Patent: March 26, 2002
    Assignee: Fresenius AG
    Inventor: Artur Meisberger
  • Patent number: 6061141
    Abstract: A method of detecting the presence of a predetermined vapor of a predetermined concentration in a monitored area, the method including the steps of (a) exposing gas in or from the monitored area to radiation at wavelengths at least covering and surrounding from both sides a main absorption peak of the vapor; (b) simultaneously sensing the radiation after passing through the gas by a signal sensor and a reference sensor, each of the sensors including a radiation sensing element, wherein the signal sensor further includes a first optical filter passing wavelengths covering the main absorption peak, yet substantially blocking wavelengths from both sides of the main absorption peak of the vapor, whereas the reference sensor further includes a second optical filter passing wavelengths surrounding from both sides the main absorption peak, yet substantially blocking wavelengths covering the main absorption peak of the vapor; and (c) comparing signals obtained from the signal and reference sensors for determining a p
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: May 9, 2000
    Assignee: Spectronix Ltd.
    Inventors: Ephraim Goldenberg, Shaul Serero, David Cohen, Yechiel Spector, Esther Jacobson
  • Patent number: 6057912
    Abstract: A method to compensate for lamp spectrum shift, comprises exposing a first detector to a first light from a lamp, thereby generating a first signal indicative of intensity of said first light; exposing a second detector to a wavelength (.lambda.) of a second light from said lamp, thereby generating a second signal indicative of intensity of said wavelength of said second light, after said second light has interacted with a sample; determining a new color temperature (T.sub.1) of said first light using the following equationT.sub.1 =(F.sub.1 /A).sup.1/xwhere A=F.sub.i /(T.sub.i).sup.x,x=a color temperature exponent of said lamp, F.sub.1 =said first signal, F.sub.i =an initial reference signal, and T.sub.i =an initial color temperature corresponding to said initial reference signal; and determining a first compensated signal (I.sub.1) using the following equationI.sub.1 32 S.sub.1 /B.sub.1where ##EQU1## S1=said second signal, h=Planck's constant, c=speed of light in vacuum, and k=Boltzman constant.
    Type: Grant
    Filed: February 11, 1999
    Date of Patent: May 2, 2000
    Assignee: UMM Electronics, Inc.
    Inventors: Mike Celentano, Greg Wiley
  • Patent number: 5825478
    Abstract: A photometer for measuring electromagnetic radiation absorption of a sample utilizing a source of the electromagnetic radiation. Electromagnetic radiation is conducted from the source, to a sample sensor or sensors, and is passed through or scattered from, the sample utilizing a sample cell. The electromagnetic radiation is then directed to a detection system which determines absorbance of electromagnetic radiation by the sample at the sample cell. The detection system includes a beam splitter which receives the electromagnetic radiation and outputs first and second beams. A first detector having a first wavelength filter and a second detector having a second wavelength filter receives the two beams from the splitters. One detector may be employed to produce a reference signal. The remaining detector or detectors produce an output signal which is a representation of a characteristic, such as absorbance of the sample.
    Type: Grant
    Filed: November 13, 1997
    Date of Patent: October 20, 1998
    Inventors: Steven Wilcox, Don S. Goldman
  • Patent number: 5699156
    Abstract: A spectrophotometer employs an array of optical elements to focus light from at least one, but preferably two light sources onto a fiber optic beam splitter that provides a pickup for a selected bandwidth of wavelengths of light in the spectral pattern. The spectral pattern can include wavelengths in the visible, near infrared and ultraviolet spectrum. To create the spectral pattern, two reflecting prisms having spherical surfaces are used, and the optical elements are arranged so that the two spectral bands from each prism are longitudinally aligned to create the spectral pattern. The prisms are on a motor driven pivot mount so that the spectral pattern may be swept across the pickup. The optical elements and the pickup are sized so that the selected bandwidth is less than twenty nanometers over the spectral pattern. The pickup is formed by a single row of the ends of fiber optic strands which are then collimated into two bundles to transmit a test component and a reference component of light.
    Type: Grant
    Filed: November 23, 1994
    Date of Patent: December 16, 1997
    Inventor: David R. Carver
  • Patent number: 5682038
    Abstract: A flow cytometry system includes a flow tube through which particles marked with different fluorochromes pass from a first location, illuminated by a red laser, to a second location, illuminated by a blue laser. A "red" photodetector is optically coupled to detect red fluorescence from both locations. "Yellow" and "green" photodetectors respectively detect yellow and green fluorescence from the second location, while a "scattered light" detector detects scattered light from the second location. During a sample run, the red photodetector can output pulses that correspond primarily to APC fluorochrome at the first location and to PerCP at the second location respectively. A delay device delays the APC pulse relative to the PerCP pulse so that the peaks can be scaled and subtracted in the analog electrical domain to remove APC/PerCP crosstalk. The delay is calibrated using a set of APC tagged cells.
    Type: Grant
    Filed: April 6, 1995
    Date of Patent: October 28, 1997
    Assignee: Becton Dickinson and Company
    Inventor: Michael A. Hoffman
  • Patent number: 5661558
    Abstract: An optical detector for flowing sample comprises a light condenser for condensing a diverging monochrome light, a flow cell arranged in the course of convergence of the converged light beam, and a sample-side detector for receiving a sample-side light. Such a construction makes it possible to correct delicate changes of the light axis due to intensity, position, temperature changes of the light source, density change of the flowing liquid, and any change of other causes effectively for stable sample analysis without difficult optical adjustment.
    Type: Grant
    Filed: June 20, 1995
    Date of Patent: August 26, 1997
    Assignee: Hitachi, Ltd.
    Inventors: Taro Nogami, Yoshiaki Yamada, Synichi Mathuura
  • Patent number: 5526122
    Abstract: In the method, the totality of the gases is conducted through an absorption cell. A reference cell contains a reference gas. The cells are optically transirradiated and a signal representing a quantity for the mass flow to be identified is generated in a detector which picks up the optical radiation emerging from the cells.
    Type: Grant
    Filed: March 14, 1994
    Date of Patent: June 11, 1996
    Assignee: Siemens Aktiengesellschaft
    Inventors: Andreas Intemann, Heinrich Korner, Konrad Hieber
  • Patent number: 5483334
    Abstract: The present invention relates to a system for generating the same instantaneous pressure between two tanks filled each with a given medium, the first tank including at least one inlet channel and at least one outlet channel for the given medium, the second tank including at least one outlet channel, and means for opening and for closing said channels. The system according to the invention further includes at least one linking capillary between each tank, intended notably for transmitting instantaneously a pressure variation from the first tank towards the second tank.
    Type: Grant
    Filed: July 19, 1994
    Date of Patent: January 9, 1996
    Assignee: Institut Francais du Petrole
    Inventors: Francois Couillard, Didier Frot
  • Patent number: 5483057
    Abstract: Apparatus for measuring the color of glass, particularly pieces of broken glass relies upon simultaneously measuring the glass transmission in different spectral regions. The glass pieces travel along a conveying path between a light source and a light sensor containing a plural number of optical filters and groups of photoelectric detectors. The groups of photoelectric detectors are disposed at an end face of respective substantially cylindrical tubes. Tube axes enclose an angle and intersect in a conveying plane defined by the conveying path. The optical filters have different spectral transmission regions. Optical lens systems are retained intermediate the respective groups of photoelectric detectors and an opposite end face of the respective tubes. Each optical lens system images the conveying plane at the associated group of photoelectric detectors.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: January 9, 1996
    Assignee: Bodenseewerk Geratetechnik GmbH
    Inventors: Michael Gross, Norbert Stelte, Dietmar Schmidt, Hans Kordulla
  • Patent number: 5423513
    Abstract: A method of analyzing fluid samples using a bent capillary flow cell, in which method an external UV/visible light ray beam is directed into an elongated section of the flow cell from a bend thereof, this incident light ray beam is limited to a solid acceptance angle .OMEGA.. This solid acceptance angle .OMEGA. is determined such that light rays which enter the elongated section traverse predominantly the longitudinal axis thereof, i.e. propagate through the fluid sample, providing an improved S/N ratio. Lens means, such as ball lenses, may be used at the entrance and exit side of the elongated section. A bent capillary flow cell is provided, in which the elongated section deviates by an angle .psi. from a line N perpendicular to a flat side face of a holding template.
    Type: Grant
    Filed: November 12, 1993
    Date of Patent: June 13, 1995
    Assignee: LC Packings International
    Inventors: Jean-Pierre Chervet, Remco E. J. Van Soest
  • Patent number: 5418614
    Abstract: The present invention concerns a new optical photometry system for on-line analysis of industrial fluid streams. The invention is a general purpose optical photometer, capable of absorption, fluorescence and reflectance measurements at single wavelengths in the ultraviolet, visible and near infrared spectral ranges. Light signals generated by the light source are carried between a central photometric console and remote analysis sites by fiber optic cables. The return light signals are compared with a standard to make the desired analysis.
    Type: Grant
    Filed: April 19, 1993
    Date of Patent: May 23, 1995
    Assignee: Texaco Inc.
    Inventors: Dale F. Brost, Frank M. Rexach, Gregory A. Winslow
  • Patent number: 5307146
    Abstract: A dual wavelength optical sensor for measuring chemical properties of a particular quantity, the optical sensor including a sensor probe having a thin sensing film whose optical characteristics are responsive to the chemical properties of the measured quantityThe United States Government has certain rights in this invention pursuant to Contract No. ITA87-02 between the U.S. Department of Commerce and Iowa State University.
    Type: Grant
    Filed: October 16, 1992
    Date of Patent: April 26, 1994
    Assignee: Iowa State University Research Foundation, Inc.
    Inventors: Marc D. Porter, Thomas P. Jones, Shelley J. Coldiron
  • Patent number: 5274227
    Abstract: A detector cell, having a capillary entrance elbow through which a beam of exposing light can be directed into the bore of a central leg of the detector cell capillary. Ray traces, to determine the effect of the entrance elbow on the beam of exposing light are used to optimize performance of this detector cell. Back ray tracing is implemented to illustrate an optimized embodiment. Forward ray tracing is also illustrated and can be used to determine system performance for a range or choices of a single parameter or for concurrent ranges of choices of a subset of the parameters of the beam of exposing light.
    Type: Grant
    Filed: October 23, 1992
    Date of Patent: December 28, 1993
    Assignee: Applied Biosystems, Inc.
    Inventor: Stephen E. Moring
  • Patent number: 5272090
    Abstract: A method and apparatus are described for an accurate determination of the concentration of a gas, vapor or a gas dissolved in a sample which compensate for variations in temperature and light - source intensity. The apparatus comprises a sensor containing a fluorescent reagent connected to a transfer optic, such as fiber optics prism or glas pipes, and to a reference sensor containing the same fluorescent reagent. The reference sensor is encapsulated in an environment containing air. The light emitted from the first sensor and the reference sensor is determined and recorded automatically, the concentration of the gas being calculated based on the output from said light detectors using calibration data of the fluorescent reagent present in the sensors. The reagent is immobilized in the sensor by a glue, such as a silicon glue.
    Type: Grant
    Filed: March 31, 1992
    Date of Patent: December 21, 1993
    Inventors: Moshe Gavish, Misha Roitberg
  • Patent number: 5124130
    Abstract: Method for making a probe with a plurality (one or more) of optical fiber sensors containing colorimetric chemical indicators in gaps in the fibers, the fibers bent to provide good light transmission qualities. Apparatus for making a probe with a plurality of such optical fiber sensors. A probe with a plurality of such optical fiber sensors. A vacuum chuck for holding the ends of such fibers.
    Type: Grant
    Filed: May 22, 1990
    Date of Patent: June 23, 1992
    Assignee: Optex Biomedical, Inc.
    Inventors: David J. Costello, James R. Salter, Leslie A. Schlain, Nadhir B. Kosa, Raghuvir Singh
  • Patent number: 5121164
    Abstract: A method for maintaining a preselected concentrations of first and second charge directors in a toner composition, where such composition is being subjected to a use in which initial concentrations of the first and second charge directors are being depleted.
    Type: Grant
    Filed: June 6, 1988
    Date of Patent: June 9, 1992
    Assignee: Spectrum Sciences B.V.
    Inventors: Benzion Landa, Yehuda Niv, Israel Grossinger, Moshe Levanon, Yossi Adam
  • Patent number: 5073345
    Abstract: A light absorption detector includes a light source substantially adjacent a window of a chromatogrpahic flow cell. The flow cell is defined by a housing member which also includes a photo-sensitive detector.
    Type: Grant
    Filed: July 9, 1985
    Date of Patent: December 17, 1991
    Assignee: The Perkin Elmer Corporation
    Inventors: Raymond P. W. Scott, Gary J. Schmidt
  • Patent number: 5002397
    Abstract: A Method and Apparatus for identifying and distinguishing fluids and for recognizing contamination of a fluid, which method and apparatus utilizes spectrographic analysis of control samples of known fluids and then spectrographic analysis of unknown fluids to generate optical signatures, finger prints and/or profiles of data and processed data relating to the relative intensities of light at selected wavelengths; and then, through comparison of the various signatures, fingerprints and/or profiles, provides determinative information as to contamination or non-contamination of the unknown fluids; after which appropriate operation control is effected and/or exercised.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: March 26, 1991
    Assignee: International Integrated Systems, Inc.
    Inventors: Jerry G. Ingrum, Douglas J. Littlejohn, Douglas Modlin
  • Patent number: 4998824
    Abstract: A method and apparatus for identifying and distinguishing fluids and for recognizing contamination of a fluid, which method and apparatus utilizes spectrographic analysis of control samples of known fluids and then spectrographic analysis of unknown fluids to generate optical signatures, finger prints and/or profiles of data and processed data relating to the relative intensities of light at selected wavelengths; and then, through comparison of the various signatures, fingerprints and/or profiles, provides determinative information as to contamination or non-contamination of the unknown fluids; after which appropriate operation control is effected and/or exercised.
    Type: Grant
    Filed: June 8, 1989
    Date of Patent: March 12, 1991
    Assignee: International Integrated Systems, Inc.
    Inventors: Douglas J. Littlejohn, Douglas Modlin, Jerry G. Ingrum, Brian R. Devlin
  • Patent number: 4900152
    Abstract: In an apparatus for determining the concentration of foreign matter in a water stream, a stream of liquid is bypassed through conduits both before and after the pipeline block for the process and each stream is pumped into a cell, a beam source being associated with each of the cells whose beams penetrate the cells and are led by a beam splitter both to a first detector and to a second detector, the electrical signals of the detectors being compared by an electrical circuit and processed to a recognition signal. To make a bubble-free sample stream possible, magnetically actuated valves are inserted into the return lines which are connected to the cells, and the signals for opening and closing the valves are produced by a frequency generator.
    Type: Grant
    Filed: February 2, 1988
    Date of Patent: February 13, 1990
    Assignee: Leybold Aktiengesellschaft
    Inventor: Gerhard Wiegleb
  • Patent number: 4878756
    Abstract: A color detecting apparatus and process in which light from a source is directed to a surface whose color is to be measured through an aspheric lens situated so that reflected radiation is returned to the aspheric lens along a reversely directed path. The aspheric lens collimates the reflected light from the surface and directs it to two or more detectors which are tuned to receive energy in two or more preselected band widths along paths which are substantially of equal length with each detector receiving energy in substantially same cross-sectional area of the collimated beam.
    Type: Grant
    Filed: August 8, 1988
    Date of Patent: November 7, 1989
    Assignee: Honeywell Inc.
    Inventor: Norman L. Stauffer
  • Patent number: 4822168
    Abstract: An analyzing apparatus provided with a spectroscopic photometer, in which light emitted by a deuterium lamp enters a flow cell; light transmitted by the flow cell is divided into two light beams by means of a beam splitter, one of which is received by a detecting element for sample measurement and the other of which is received by a detecting element for monitoring through a filter transmitting only light in a predetermined wavelength region, which is not essentially absorbed by the sample; and a signal processing device compares the output signal of the detecting element for sample measurement with that of the detecting element for monitoring and effects necessary operations.
    Type: Grant
    Filed: August 19, 1986
    Date of Patent: April 18, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Taro Nogami, Tetsuyuki Miwa, Kenitiro Takahasi
  • Patent number: 4726680
    Abstract: To reduce noise in an absorbance monitor in which the light source is a deuterium lamp, an aspheric condensing mirror focuses light from an approximately 0.6 mm-high by 2 mm-wide part of the central bright spot in the deuterium lamp through a slit in an aperture plate which blocks all other light and an aspheric monochromator mirror focuses the light onto a plane reflective diffraction grating, which: (1) is mounted for orbiting about an axis parallel to the longitudinal axis of the slit; and (2) adjusted so that, as it orbits it reflects a selected wavelength of light to a beam splitter. Each beam is focused upon and transmitted through a different one of two equal oval apertures optically at least as large as the height of the image of the aperture near the lamp.
    Type: Grant
    Filed: October 28, 1985
    Date of Patent: February 23, 1988
    Assignee: Isco, Inc.
    Inventor: Robert W. Allington
  • 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