公开(公告)号：US11209356B2

公开(公告)日：2021-12-28

申请号：US16656045

申请日：2019-10-17

Applicant: SHIMADZU CORPORATION

Inventor： Kazune Mano

IPC: G01N21/39 ,  G01N21/3504 ,  G01J3/433

Abstract: A gas absorption spectrometer is provided that is capable of measuring a gas concentration and the like with high accuracy even when a measurement target gas is mixed with a gas other than the measurement target gas. A gas absorption spectrometer includes: a wavelength tunable light source; a light source control unit to change a wavelength of the light source; a gas cell to have a measurement object gas introduced thereto, the measurement object gas containing a measurement target gas and a mixed gas other than the measurement target gas; a photodetector to detect intensity of light having passed through the gas cell; a spectrum preparation unit to prepare an absorption spectrum of the measurement object gas from a change in the light intensity relative to the change in the wavelength; a physical quantity measurement unit to measure at least one of a temperature and a concentration of the measurement target gas based on an absorption spectrum of the measurement target gas; a gas concentration measurement unit to measure a concentration of the mixed gas; and a physical quantity correction unit to correct at least one of the temperature and the concentration of the measurement target gas measured by the physical quantity measurement unit based on the concentration of the mixed gas.

公开(公告)号：US20210164837A1

公开(公告)日：2021-06-03

申请号：US17257526

申请日：2019-06-26

Applicant: Q.E.D. ENVIRONMENTAL SYSTEMS LIMITED

Inventor： Fabrice Marcel Serge Bounaix ,  Antonia Cortina ,  Gabriele Finardi

IPC: G01J3/433 ,  G01J3/02 ,  G01N21/03 ,  G01N21/3504 ,  G01N21/39

Abstract: A portable optical spectroscopy device is disclosed for analyzing gas samples and/or for measurement of species concentration, number density, or column density. The device includes a measuring chamber with the gas sample to be analyzed, a light source with at least one laser diode for emitting a laser beam along a light path running through the measuring chamber at least in certain regions, means for modulating the wavelength of the light beam emitted by the light source, and an optical detector device having a first optical detector and at least one second optical detector. At least a part of the light emitted by the laser diode is detected after the light has passed through the measuring chamber m-times, and at least a part of the light emitted by the laser diode is detected with the at least one second optical detector after the light has passed through the measuring chamber n-times, where n>m applies.

公开(公告)号：US20210131868A1

公开(公告)日：2021-05-06

申请号：US16622906

申请日：2018-06-15

Applicant: IRsweep AG

Inventor： Andreas HUGI

IPC: G01J3/10 ,  G01J3/433

Abstract: A heterodyne detection spectrometer setup comprises an optical path with at least a first cavity able to emit a first laser beam; a second cavity able to emit a second laser beam; and at least one combining and/or reflecting element. The cavities are connected to current drivers for stimulating laser emission, which shows increased signal-to-noise ratios of the heterodyne signal and an increased dynamic range. This can be reached if at least the second cavity comprises an active medium connected to a heterodyne signal extraction element and a (multi-) heterodyne signal processing unit, which is simultaneously usable for laser light generation and as detector element, comprising an active medium introduced in the optical path in order that the first and/or second laser beam can enter the respective other cavity. At least one reference path is established between the two cavities in the optical path with at least two combining and/or reflecting elements.

公开(公告)号：US20210041295A1

公开(公告)日：2021-02-11

申请号：US16536265

申请日：2019-08-08

Applicant: Apple Inc.

Inventor： Sireesha Ramisetti ,  Chia-Chi Chen ,  Vusthla Sunil Reddy ,  Peter M. Agboh ,  Vijendrakumar K. Ashiwal

IPC: G01J3/433 ,  G01N21/3581

Abstract: Embodiments of a terahertz (THz) sensor module are disclosed for spectroscopy and imaging in a dynamic environment. In an embodiment, a terahertz (THz) sensor module comprises: a THz emitter configured to emit a THz beam into an environment; one or more movable micro-electromechanical system (MEMS) micromirrors; and one or more MEMS motors or actuators coupled to the one or more MEMS micromirrors. The one or more MEMS motors or actuators are configured to move the one or more MEMS micromirrors to change a direction of the THz beam in the environment. A THz receiver is configured to receive a reflection of the THz beam from a reflective object in the environment.

公开(公告)号：US10775297B2

公开(公告)日：2020-09-15

申请号：US15446878

申请日：2017-03-01

Applicant: EcoTec Solutions, Inc.

Inventor： Laurent Jourdainne

IPC: G01N21/01 ,  G01N21/359 ,  G01J3/427 ,  G01N21/03 ,  G01M3/20 ,  G01N21/3504 ,  G01M3/22 ,  G01N21/39 ,  G01K13/00 ,  G01N21/31 ,  G01N33/00 ,  G01J3/42 ,  G01J3/433

Abstract: A system and method to discriminate between a first preselected gas and at least one other preselected gas use of an absorption spectroscopy analyzer that includes a Herriott cell and a temperature sensitive light source. The light source operates at a temperature that emits a beam at a wavelength that corresponds to high absorption by a first preselected gas. When a predetermined level of this gas is detected in a gas sample, the analyzer changes the operating temperature of the light source to emit a beam at a wavelength that corresponds to high absorption by a second preselected gas. The second preselected gas can be a different isotope of the first preselected gas.

公开(公告)号：US20200158573A1

公开(公告)日：2020-05-21

申请号：US16773560

申请日：2020-01-27

Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION ,  The Trustees of Princeton University

Inventor： Cheyenne Teng ,  Gerard Wysocki ,  Eric J. Zhang ,  William M. Green

IPC: G01J3/453 ,  G01N21/3504 ,  G01J3/433

Abstract: 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.

公开(公告)号：US10551303B2

公开(公告)日：2020-02-04

申请号：US15633678

申请日：2017-06-26

Applicant: GE HEALTHCARE BIO-SCIENCES AB

Inventor： Hakan Frojdh ,  Mikael Hornqvist ,  Stig Tormod ,  Patrik Akerstrom

IPC: G01N21/33 ,  G01J3/02 ,  G01N21/05 ,  G01J3/42 ,  G01N21/51 ,  G01J3/433 ,  G01N21/03

Abstract: The present invention discloses a flow cell optical detection system comprising a light source, a flow cell and a light detector, wherein the light detector is arranged in a separate detector unit that is arranged to be releasably attached to a detector interface, the detector interface being in optical communication with the light source and comprises optical connectors for optically connecting the flow cell and the detector unit in the light path from the light source, and wherein the flow cell is an interchangeable unit arranged to be held in position by the detector unit when attached to the detector interface.

公开(公告)号：US20190368935A1

公开(公告)日：2019-12-05

申请号：US16290219

申请日：2019-03-01

Applicant: The Boeing Company

Inventor： Robert A. Smith ,  David K. Mefford

IPC: G01J3/433 ,  G01N33/53 ,  G01N21/39

Abstract: A dual sensor, includes: one or more analyte detectors, each having an analyte-specific binding site for interacting with a specific analyte; an optical source generating a first frequency comb spectrum directed to an environment to be scanned, the first frequency comb spectrum having multiple optical frequencies at a first frequency range; an optical spectrum analyzer analyzing an optical spectrum resulting from interaction of the first frequency comb spectrum with the environment; and a controller that is configured, where an analyte detector indicates presence of a specific analyte, to adjust the first frequency comb spectrum to increase sensitivity for detecting the specific analyte.

公开(公告)号：US10466106B2

公开(公告)日：2019-11-05

申请号：US16219136

申请日：2018-12-13

Applicant: NEC Laboratories America, Inc.

Inventor： Da Pan ,  Yue Tian ,  Ming-Fang Huang

IPC: G01J3/433 ,  G01N21/39 ,  G01N21/27

Abstract: A computer-implemented method for measuring gas concentration from a 2f signal in wavelength modulation spectroscopy is presented. The computer-implemented method includes emitting a beam of light from a laser to pass through a gas sample, calculating a gas measurement value from the gas sample via a trough distance calculator using a trough distance of a gas absorption line's 2f signal, calibrating the gas measurement value via a multi-point calibration process, and outputting the gas measurement value to a user interface of a computing device.

公开(公告)号：US10437033B2

公开(公告)日：2019-10-08

申请号：US15840476

申请日：2017-12-13

Applicant: DAYLIGHT SOLUTIONS, INC.

Inventor： Jeremy Rowlette ,  Edeline Fotheringham ,  Justin Kane ,  Mark V. Bermal ,  David Nichols ,  William Chapman

IPC: G02B21/00 ,  G02B21/36 ,  G01J3/28 ,  G01J3/12 ,  G01J3/02 ,  G01J1/00 ,  G02B21/08 ,  G01J3/10 ,  G01J3/433 ,  H01S5/14

Abstract: A spectral imaging device (12) for generating an image (13A) of a sample (10) includes (i) an image sensor (30); (ii) a tunable light source (14) that generates an illumination beam (16) that is directed at the sample (10); (iii) an optical assembly (22) that collects light from the sample (10) and forms an image of the sample (10) on the image sensor (30); and (iv) a control system (32) that controls the tunable light source (14) and the image sensor (30). During a time segment, the control system (32) (i) controls the tunable light source (14) so that the illumination beam (16) has a center wavenumber that is modulated through a first target wavenumber with a first modulation rate; and (ii) controls the image sensor (30) to capture at least one first image at a first frame rate. Further, the first modulation rate is equal to or greater than the first frame rate.