Baseline Drift Correction Circuitry Patents (Class 73/23.23)
  • Patent number: 8511140
    Abstract: An apparatus and a method of chemical analysis entail acquiring a chromatogram, median filtering the chromatogram to produce a model baseline, smoothing the model baseline to reduce noise, and subtracting the smoothed model baseline from the acquired chromatogram to produce a modified chromatogram having a substantially flat baseline.
    Type: Grant
    Filed: October 25, 2006
    Date of Patent: August 20, 2013
    Assignee: Waters Technologies Corporation
    Inventors: Marc V. Gorenstein, Anthony C. Gilby
  • Patent number: 8500849
    Abstract: A differential absorption spectrum for a reactive gas in a gas mixture can be generated for sample absorption data by subtracting background absorption data set from the sample absorption data. The background absorption data can be characteristic of absorption characteristics of the background composition in a laser light scan range that includes a target wavelength. The differential absorption spectrum can be converted to a measured concentration of the reactive gas using calibration data. A determination can be made whether the background composition has substantially changed relative to the background absorption data, and new background absorption data can be used if the background composition has substantially changed. Related systems, apparatus, methods, and/or articles are also described.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: August 6, 2013
    Assignee: SpectraSensors, Inc.
    Inventors: Xin Zhou, Xiang Liu, Alfred Feitisch, Gregory M. Sanger
  • Patent number: 8371152
    Abstract: A device for conserving helium gas in a gas chromatograph system is characterized in that during the majority of an analytical separation, helium is used as the carrier gas while an auxiliary non-helium gas is used to pressurize the inlet and provide for septum purge and split vent flow. Prior an injection period, a coaxial helium flow is established at the column entrance wherein the coaxial helium flow is less than the column flow. Following the injection and sample transfer period, a coaxial helium flow is established wherein the flow is greater than the column flow.
    Type: Grant
    Filed: October 27, 2010
    Date of Patent: February 12, 2013
    Assignee: Thermo Finnigan LLC
    Inventors: Edward B. McCauley, Paolo Magni
  • Patent number: 8249817
    Abstract: A chromatograph analyzing device for automatically executing a base line setting process on an unseparated peak using preset base line conditions. The chromatograph analyzing device includes a separation unit for separating a component included in a sample, and a data processing device for identifying the component of the sample and the quantity of the component in the sample by using a chromatogram obtained from the separation.
    Type: Grant
    Filed: December 8, 2009
    Date of Patent: August 21, 2012
    Assignee: Hitachi High-Technologies Corporation
    Inventors: Osamu Watabe, Masahito Ito
  • Patent number: 8166799
    Abstract: A gas concentration distribution measuring apparatus includes a gas detection part, a gas detector position information measuring part, and a gas concentration distribution display unit. The detection part includes gas detectors provided at mutually different positions to measure a concentration of a predetermined gas, and moves while maintaining relative positions of the detectors. The position information measuring part measures position information of the detectors of the detection part. And, measured values of gas concentrations measured by the detectors of the detection part and position information of the detectors measured by the position information measuring part when the detectors finish measurement of gas concentrations are inputted in the display unit, then the display unit displays a distribution of concentrations of the predetermined gas in a space in which the detection part moves, based on the measured values of the gas concentrations and the position information of the detectors.
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: May 1, 2012
    Assignee: Toppan Printing Co., Ltd
    Inventor: Noritaka Nakaso
  • Patent number: 8152900
    Abstract: A differential absorption spectrum for a reactive gas in a gas mixture can be generated for sample absorption data by subtracting background absorption data set from the sample absorption data. The background absorption data can be characteristic of absorption characteristics of the background composition in a laser light scan range that includes a target wavelength. The differential absorption spectrum can be converted to a measured concentration of the reactive gas using calibration data. A determination can be made whether the background composition has substantially changed relative to the background absorption data, and new background absorption data can be used if the background composition has substantially changed. Related systems, apparatus, methods, and/or articles are also described.
    Type: Grant
    Filed: October 25, 2010
    Date of Patent: April 10, 2012
    Assignee: SpectraSensors, Inc.
    Inventors: Xin Zhou, Xiang Liu, Alfred Feitisch, Gregory M. Sanger
  • Patent number: 7941288
    Abstract: A chemical agent detector with a a lesser demand sensor, a greater demand sensor, an inlet; and a manifold; and methods associated therewith. The manifold is positioned between the inlet and the sensors, and includes a first intake associated with the lesser demand sensor, a second intake associated with a greater demand sensor, and at least one restrictor. The first intake is placed closer to the inlet than the second intake, and the second intake is isolated from the inlet by at least one restrictor within the manifold. The intakes and restrictor are sized and positioned such that the ratio between: the conductance of the path from the inlet to the greater demand sensor to the conductance of the path between the sensors effectively isolates the lesser demand sensor from the effects of the greater demand sensor.
    Type: Grant
    Filed: September 26, 2006
    Date of Patent: May 10, 2011
    Assignee: Science Applications International Corporation
    Inventors: Steven Gerald Haupt, James Ha, David Rose
  • Patent number: 7854607
    Abstract: A control for controlling the operation of a fuel-fired heating appliance is provided that include a sensor capable of sensing the presence of carbon monoxide gas and providing an output indicative of the level of carbon monoxide gas. The control further includes a microprocessor that periodically reads the CO sensor output and stores at least one sensor output value in a memory, wherein the microprocessor responsively discontinues the operation of the appliance when the microprocessor detects a sensor output that has increased by more than a predetermined amount over at least one previously stored sensor output value. In one embodiment, the control is preferably configured to periodically read the sensor output value, and responsive discontinue operation of an appliance upon sensing a predetermined increase of at least a 50 percent increase over the previously monitored sensor output value over a period of about 15 to 90 minutes.
    Type: Grant
    Filed: June 16, 2009
    Date of Patent: December 21, 2010
    Assignee: Emerson Electric Co.
    Inventors: Donald E. Donnelly, Thomas J. Fredricks
  • Patent number: 7819946
    Abstract: A differential absorption spectrum for a reactive gas in a gas mixture can be generated for sample absorption data by subtracting background absorption data set from the sample absorption data. The background absorption data can be characteristic of absorption characteristics of the background composition in a laser light scan range that includes a target wavelength. The differential absorption spectrum can be converted to a measured concentration of the reactive gas using calibration data. A determination can be made whether the background composition has substantially changed relative to the background absorption data, and new background absorption data can be used if the background composition has substantially changed. Related systems, apparatus, methods, and/or articles are also described.
    Type: Grant
    Filed: April 19, 2010
    Date of Patent: October 26, 2010
    Assignee: SpectraSensors, Inc.
    Inventors: Xin Zhou, Xiang Liu, Alfred Feitisch, Gregory M. Sanger
  • Patent number: 7704301
    Abstract: A differential absorption spectrum for a reactive gas in a gas mixture can be generated for sample absorption data by subtracting background absorption data set from the sample absorption data. The background absorption data can be characteristic of absorption characteristics of the background composition in a laser light scan range that includes a target wavelength. The differential absorption spectrum can be converted to a measured concentration of the reactive gas using calibration data. A determination can be made whether the background composition has substantially changed relative to the background absorption data, and new background absorption data can be used if the background composition has substantially changed. Related systems, apparatus, methods, and/or articles are also described.
    Type: Grant
    Filed: April 11, 2008
    Date of Patent: April 27, 2010
    Assignee: SpectraSensors, Inc.
    Inventors: Xin Zhou, Xiang Liu, Alfred Feitisch, Gregory M. Sanger
  • Patent number: 7581946
    Abstract: A control for controlling the operation of a fuel-fired heating appliance is provided that include a sensor capable of sensing the presence of carbon monoxide gas and providing an output indicative of the level of carbon monoxide gas. The control further includes a microprocessor that periodically reads the CO sensor output and stores at least one sensor output value in a memory, wherein the microprocessor responsively discontinues the operation of the appliance when the microprocessor detects a sensor output that has increased by more than a predetermined amount over at least one previously stored sensor output value. In one embodiment, the control is preferably configured to periodically read the sensor output value, and responsive discontinue operation of an appliance upon sensing a predetermined increase of at least a 50 percent increase over the previously monitored sensor output value over a period of about 15 to 90 minutes.
    Type: Grant
    Filed: November 2, 2005
    Date of Patent: September 1, 2009
    Assignee: Emerson Electric Co.
    Inventors: Donald E. Donnelly, Thomas J. Fredricks
  • Patent number: 7356446
    Abstract: A method for analyzing a multi-channel chromatogram is realized for accurately resolving overlapping peaks on a multi-channel chromatogram to permit analysis of the composition of a sample. First, components of overlapping peaks are specified. A data matrix Dij is determined, and compressed in the wavelength direction to obtain a data matrix vector Di. Next, the two-dimensional data is deconvoluted, final standard deviation s0 is registered, and the deconvoluted two-dimensional data is reconvoluted to a retention intensity matrix. A quantitative spectral intensity matrix is computed, components are identified, and the identified components are quantified. Subsequently, an eigenvalue problem is solved, and the number n of components is estimated. The deconvolution and computation of the eigenvalue problem are iteratively executed until the peaks are isolated. Then, elution profiles are calculated, the components are identified, and the identified components are quantified.
    Type: Grant
    Filed: August 10, 2006
    Date of Patent: April 8, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Masahito Ito, Kisaburo Deguchi
  • Patent number: 7110886
    Abstract: A method for analyzing a multi-channel chromatogram is realized for accurately resolving overlapping peaks on a multi-channel chromatogram to permit analysis of the composition of a sample. First, components of overlapping peaks are specified. A data matrix Dij is determined, and compressed in the wavelength direction to obtain a data matrix vector Di. Next, the two-dimensional data is deconvoluted, final standard deviation s0 is registered, and the deconvoluted two-dimensional data is reconvoluted to a retention intensity matrix. A quantitative spectral intensity matrix is computed, components are identified, and the identified components are quantified. Subsequently, an eigenvalue problem is solved, and the number n of components is estimated. The deconvolution and computation of the eigenvalue problem are iteratively executed until the peaks are isolated. Then, elution profiles are calculated, the components are identified, and the identified components are quantified.
    Type: Grant
    Filed: July 18, 2005
    Date of Patent: September 19, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Masahito Ito, Kisaburo Deguchi
  • Patent number: 7041256
    Abstract: A poison resistant combustible gas sensing element, a method for its production and a method for determining poisoning of the element. The element includes an electric heating element, an inner layer coated on the electric heating element and containing a precious metal catalyst supported on a porous oxide, the precious metal catalyst catalyzing combustion of a combustible gas to be detected by the element, and an outer layer overlaying the first layer, and containing a catalytic compound capable of trapping gases which poison the precious metal catalyst, the catalytic compound being supported on a porous oxide.
    Type: Grant
    Filed: January 30, 2001
    Date of Patent: May 9, 2006
    Assignee: Industrial Scientific Corporation
    Inventors: Chuan-Bao Wang, Beth Tomasovic, P. Richard Warburton, Annie Q. Wang
  • Patent number: 7007542
    Abstract: A poison resistant combustible gas sensing element, a method for its production and a method for determining poisoning of the element. The element includes an electric heating element, an inner layer coated on the electric heating element and containing a precious metal catalyst supported on a porous oxide, the precious metal catalyst catalyzing combustion of a combustible gas to be detected by the element, and an outer layer overlaying the first layer, and containing a catalytic compound capable of trapping gases which poison the precious metal catalyst, the catalytic compound being supported on a porous oxide.
    Type: Grant
    Filed: June 16, 2003
    Date of Patent: March 7, 2006
    Assignee: Industrial Scientific Corporation
    Inventors: Chuan-Bao Wang, Beth Tomasovic, P. Richard Warburton, Annie Q. Wang
  • Patent number: 6934638
    Abstract: A method for analyzing a multichannel chromatogram is realized for accurately resolving overlapping peaks on a multichannel chromatogram to permit analysis of the composition of a sample.
    Type: Grant
    Filed: April 4, 2002
    Date of Patent: August 23, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Masahito Ito, Kisaburo Deguchi
  • Patent number: 6856917
    Abstract: A method of properly correcting a base line. A concept of flexibility of a base line is introduced as an input index and a gravitation is presumed between the base line and signal data which is measured, thereby constructing a method of correcting the base line which changes gentler than a change in signal with respect to time in a peak area and which is sensitive to an area where a value of the signal data is small. A base line like a natural and smooth curve which isn't easily influenced by a local change in signal such as noise or the like can be set by an input of the flexibility.
    Type: Grant
    Filed: October 28, 2003
    Date of Patent: February 15, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Masahito Ito, Kisaburo Deguchi, Yoshiaki Seki
  • Patent number: 6675107
    Abstract: A method of properly correcting a base line. A concept of flexibility of a base line is introduced as an input index and a gravitation is presumed between the base line and signal data which is measured, thereby constructing a method of correcting the base line which changes gentler than a change in signal with respect to time in a peak area and which is sensitive to an area where a value of the signal data is small. A base line like a natural and smooth curve which isn't easily influenced by a local change in signal such as noise or the like can be set by an input of the flexibility.
    Type: Grant
    Filed: December 16, 2002
    Date of Patent: January 6, 2004
    Assignees: Hitachi, Ltd., Hitachi Instruments Engineering Co., Ltd.
    Inventors: Masahito Ito, Kisaburo Deguchi, Yoshiaki Seki
  • Patent number: 6529836
    Abstract: A method of properly correcting a base line. A concept of flexibility of a base line is introduced as an input index and a gravitation is presumed between the base line and signal data which is measured, thereby constructing a method of correcting the base line which changes gentler than a change in signal with respect to time in a peak area and which is sensitive to an area where a value of the signal data is small. A base line like a natural and smooth curve which isn't easily influenced by a local change in signal such as noise or the like can be set by an input of the flexibility.
    Type: Grant
    Filed: August 29, 2001
    Date of Patent: March 4, 2003
    Assignees: Hitachi, Ltd., Hitachi Instruments Engineering Co., Ltd.
    Inventors: Masahito Ito, Kisaburo Deguchi, Yoshiaki Seki
  • Patent number: 6418778
    Abstract: A gas detector equipped with a sensor-monitoring feedback function includes a casing and a base board housing a circuit board therein. The circuit board supports a plurality of electronic elements, including a processor unit consisting of a micro control chip (MCU), two output units including a plurality of LED lights and a buzzer, an input unit including a power supply, a voltage stabilizer and a power breaker circuit, an amplification circuit, a sensor and a detection circuit. The detection is capable of monitoring the sensor for normal function and service, and providing feedback constantly so that users will be alerted immediately to malfunction or out of order condition that necessitate repairs and replacement thereby giving users the best possible protection. The gas detector of the invention will also automatically cutoff electricity supply to the sensor for preventing a gas explosion.
    Type: Grant
    Filed: February 26, 2001
    Date of Patent: July 16, 2002
    Inventor: Jong-Jiing Shiau
  • Patent number: 6408684
    Abstract: A detection device for an apparatus for carrying out analysis such as a chromatograph includes not only a detector for outputting detection signals but also a stabilization judging unit for measuring drift and noise of these detection signals over time and automatically transmitting a start signal which permits the apparatus for analysis to start its operations when the measured drift becomes smaller than a standard drift value such as one-tenth of the optical absorbance measured for a spectrum of an analyzed sample at the detection wavelength. A standard noise value setting unit may be further provided for receiving detection signals at detection wavelength while a standard sample is placed inside a detection cell, calculating a standard noise value on the basis of intensity of the detection signals, and transmitting the calculated standard noise value to the stabilization judging unit.
    Type: Grant
    Filed: January 21, 2000
    Date of Patent: June 25, 2002
    Assignee: Shimadzu Corporation
    Inventor: Hajime Bungo
  • Patent number: 6314374
    Abstract: A method of properly correcting a base line. A concept of flexibility of a base line is introduced as an input index and a gravitation is presumed between the base line and signal data which is measured, thereby constructing a method of correcting the base line which changes gentler than a change in signal with respect to time in a peak area and which is sensitive to an area where a value of the signal data is small. A base line like a natural and smooth curve which isn't easily influenced by a local change in signal such as noise or the like can be set by an input of the flexibility.
    Type: Grant
    Filed: May 1, 2000
    Date of Patent: November 6, 2001
    Assignees: Hitachi, Ltd., Hitachi Instruments Engineering Co., Ltd.
    Inventors: Masahito Ito, Kisaburo Deguchi, Yoshiaki Seki
  • Patent number: 6237392
    Abstract: An inspection apparatus for gas detectors is disclosed which comprises an open-feasibly air-tight testing reservoir in which gas detectors to be tested can be positioned, an air-tight dispensing reservoir for mixing the gas to be tested, a vacuum device for making the testing reservoir and the dispensing reservoir in vacuum, a gas supply device for supplying at least a standard gas and a diluting gas to the dispensing reservoir, and a controlling means for controlling the dispensation of the gases to each of the above-described components of the invention. By means of the invention, the executions of the mixing of the gases and the detection of the gas detector are substantially simultaneous and thus the time consumption as well as the amount of required gas are reduced. Moreover, an automatic control is available when the inspection apparatus of the invention is equipped with a computer.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: May 29, 2001
    Assignee: Industrial Technology Research Institute
    Inventors: Gu-Sheng Yu, Yao Min Lin