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公开(公告)号：US10677726B2
公开(公告)日：2020-06-09
申请号：US15846912
申请日：2017-12-19
发明人： William Green , Chu Cheyenne Teng , Gerard Wysocki , Chi Xiong , Eric Zhang
摘要： A tunable diode laser absorption spectroscopy device includes a tunable diode laser. A laser driver is configured to drive the diode laser and ramp it within a particular frequency range. An analyte gas container, a reference gas container, and a fringe generating device are configured to receive the laser therethrough. An optical detector is configured to detect the laser after it has passed through the analyte gas container and/or the reference gas container, and the in-line fringe generating device. An acquisition card is configured to sample an output of the optical detector. A spectral analyzer is configured to receive output data from the acquisition card, determine a spectrum of the output data, decouple the fringe spectrum from the measured spectrum, calibrate the spectrum based on an expected ideal spectrum of both the fringe and reference gas, and determine a composition of the analyte based on the calibrated spectrum.
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2.发明申请公开(公告)号：US20200309690A1
公开(公告)日：2020-10-01
申请号：US16364544
申请日：2019-03-26
发明人： William Green , Matthias Dittberner , Chi Xiong , Eric Zhang , Gerard Wysocki
摘要： A generalized feed-forward method for accurate tunable laser absorption spectroscopy includes generating a laser beam. The generated laser beam is directed down a reference path and a test/sample path. One or more parameters are extracted from the reference path. The one or more parameters, extracted from the reference path, are used as feed-forward, to adjust spectral analysis of the test/sample path to detect a composition and/or concentration of an analyte gas within the test/sample path. The extraction of the one or more parameters from the reference path and the spectral analysis of the test/sample path are performed substantially concurrently.
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公开(公告)号：US20180328840A1
公开(公告)日：2018-11-15
申请号：US15914455
申请日：2018-03-07
发明人： WILLIAM GREEN , Chu Cheyenne Teng , Gerard Wysocki , Eric Zhang
摘要： An on-chip spectroscopic sensor includes a tunable diode laser. A laser driver for drives the tunable diode laser. An analyte test cavity receives a chemical sample and exposes the received chemical sample to light from the tunable diode laser. An optical detector detects light emerging from the analyte test cavity as a result of the laser exposure. A spectral analyzer determines a spectrum of the emerging light, matches and removes one or more known optical fringe patterns from the determined spectrum, and determines a composition or concentration of the chemical sample from the optical fringe pattern-removed spectrum.
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4.发明申请公开(公告)号：US20200064192A9
公开(公告)日：2020-02-27
申请号：US15981467
申请日：2018-05-16
发明人： Cheyenne Teng , Gerard Wysocki , Eric J. Zhang , William M. Green
IPC分类号： G01J3/453 , G01J3/433 , G01N21/3504
摘要： A method is provided for Fourier domain dynamic correction of optical fringes in a laser spectrometer. The method includes Fourier transforming a background spectrum contaminated with the optical fringes to obtain baseline fringes in a frequency domain. The method includes partitioning the baseline fringes in the frequency domain using bandpass filtering to obtain partitioned baseline fringes. The method includes reconstructing the partitioned baseline fringes as separate spectra using an inverse Fourier transform. The method includes constructing a fitting model to approximate the background spectrum by assigning a first and a second free parameter to each of partitioned baseline fringe components to respectively allow for drift and amplitude adjustments during a fitting of the fitting model. The method includes applying the fitting model to a newly acquired spectrum to provide an interpretation of the newly acquired spectrum having a reduced influence of spectral contamination on concentration retrieval.
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5.发明授权公开(公告)号：US11041803B2
公开(公告)日：2021-06-22
申请号：US16364544
申请日：2019-03-26
发明人： William Green , Matthias Dittberner , Chi Xiong , Eric Zhang , Gerard Wysocki
摘要： A generalized feed-forward method for accurate tunable laser absorption spectroscopy includes generating a laser beam. The generated laser beam is directed down a reference path and a test/sample path. One or more parameters are extracted from the reference path. The one or more parameters, extracted from the reference path, are used as feed-forward, to adjust spectral analysis of the test/sample path to detect a composition and/or concentration of an analyte gas within the test/sample path. The extraction of the one or more parameters from the reference path and the spectral analysis of the test/sample path are performed substantially concurrently.
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公开(公告)号：US11022542B2
公开(公告)日：2021-06-01
申请号：US16504100
申请日：2019-07-05
发明人： William Green , Chu Cheyenne Teng , Gerard Wysocki , Eric Zhang
摘要： An on-chip spectroscopic sensor includes a tunable diode laser. A laser driver for drives the tunable diode laser. An analyte test cavity receives a chemical sample and exposes the received chemical sample to light from the tunable diode laser. An optical detector detects light emerging from the analyte test cavity as a result of the laser exposure. A spectral analyzer determines a spectrum of the emerging light, matches and removes one or more known optical fringe patterns from the determined spectrum, and determines a composition or concentration of the chemical sample from the optical fringe pattern-removed spectrum.
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7.发明申请公开(公告)号：US20200158573A1
公开(公告)日：2020-05-21
申请号：US16773560
申请日：2020-01-27
发明人： Cheyenne Teng , Gerard Wysocki , Eric J. Zhang , William M. Green
IPC分类号： G01J3/453 , G01N21/3504 , G01J3/433
摘要： A method is provided for Fourier domain dynamic correction of optical fringes in a laser spectrometer. The method includes Fourier transforming a background spectrum contaminated with the optical fringes to obtain baseline fringes in a frequency domain. The method includes partitioning the baseline fringes in the frequency domain to obtain partitioned baseline fringes. The method includes reconstructing the partitioned baseline fringes as separate spectra. The method includes constructing a fitting model to approximate the background spectrum by assigning a first and a second free parameter to each of partitioned baseline fringe components to respectively allow for drift and amplitude adjustments during a fitting of the fitting model. The method includes applying the fitting model to a newly acquired spectrum to provide an interpretation of the newly acquired spectrum having a reduced influence of spectral contamination on concentration retrieval.
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公开(公告)号：US10578547B2
公开(公告)日：2020-03-03
申请号：US15914455
申请日：2018-03-07
发明人： William Green , Chu Cheyenne Teng , Gerard Wysocki , Eric Zhang
摘要： An on-chip spectroscopic sensor includes a tunable diode laser. A laser driver for drives the tunable diode laser. An analyte test cavity receives a chemical sample and exposes the received chemical sample to light from the tunable diode laser. An optical detector detects light emerging from the analyte test cavity as a result of the laser exposure. A spectral analyzer determines a spectrum of the emerging light, matches and removes one or more known optical fringe patterns from the determined spectrum, and determines a composition or concentration of the chemical sample from the optical fringe pattern-removed spectrum.
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9.发明授权公开(公告)号：US11085826B2
公开(公告)日：2021-08-10
申请号：US16773560
申请日：2020-01-27
发明人： Cheyenne Teng , Gerard Wysocki , Eric J. Zhang , William M. Green
IPC分类号： G01J3/453 , G01N21/3504 , G01J3/433 , G01J3/42
摘要： A method is provided for Fourier domain dynamic correction of optical fringes in a laser spectrometer. The method includes Fourier transforming a background spectrum contaminated with the optical fringes to obtain baseline fringes in a frequency domain. The method includes partitioning the baseline fringes in the frequency domain to obtain partitioned baseline fringes. The method includes reconstructing the partitioned baseline fringes as separate spectra. The method includes constructing a fitting model to approximate the background spectrum by assigning a first and a second free parameter to each of partitioned baseline fringe components to respectively allow for drift and amplitude adjustments during a fitting of the fitting model. The method includes applying the fitting model to a newly acquired spectrum to provide an interpretation of the newly acquired spectrum having a reduced influence of spectral contamination on concentration retrieval.
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10.发明授权公开(公告)号：US10605663B2
公开(公告)日：2020-03-31
申请号：US15981467
申请日：2018-05-16
发明人： Cheyenne Teng , Gerard Wysocki , Eric J. Zhang , William M. Green
IPC分类号： G01J3/453 , G01N21/3504 , G01J3/433 , G01J3/42
摘要： A method is provided for Fourier domain dynamic correction of optical fringes in a laser spectrometer. The method includes Fourier transforming a background spectrum contaminated with the optical fringes to obtain baseline fringes in a frequency domain. The method includes partitioning the baseline fringes in the frequency domain using bandpass filtering to obtain partitioned baseline fringes. The method includes reconstructing the partitioned baseline fringes as separate spectra using an inverse Fourier transform. The method includes constructing a fitting model to approximate the background spectrum by assigning a first and a second free parameter to each of partitioned baseline fringe components to respectively allow for drift and amplitude adjustments during a fitting of the fitting model. The method includes applying the fitting model to a newly acquired spectrum to provide an interpretation of the newly acquired spectrum having a reduced influence of spectral contamination on concentration retrieval.
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