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    Apparatuses and methods for anomalous gas concentration detection
    32.
    发明授权
    Apparatuses and methods for anomalous gas concentration detection 有权

    公开(公告)号：US11692900B2

    公开(公告)日：2023-07-04

    申请号：US17408886

    申请日：2021-08-23

    Applicant: Bridger Photonics, Inc.

    Inventor： Aaron Thomas Kreitinger ,  Michael James Thorpe

    IPC: G01M3/18 ,  G01J3/433 ,  G01N21/39 ,  G06V10/30 ,  G01J3/42 ,  G01S17/88

    CPC classification number: G01M3/18 ,  G01J3/4338 ,  G01N21/39 ,  G06V10/30 ,  G01J2003/423 ,  G01S17/88

    Abstract: Embodiments of the disclosure are drawn to apparatuses and methods for anomalous gas concentration detection. A spectroscopic system, such as a wavelength modulated spectroscopy (WMS) system may measure gas concentrations in a target area. However, noise, such as speckle noise, may interfere with measuring relatively low concentrations of gas, and may lead to false positives. A noise model, which includes a contribution from a speckle noise model, may be used to process data from the spectroscopic system. An adaptive threshold may be applied based on an expected amount of noise. A speckle filter may remove measurements which are outliers based on a measurement of their noise. Plume detection may be used to determine a presence of gas plumes. Each of these processing steps may be associated with a confidence, which may be used to determine an overall confidence in the processed measurements/gas plumes.

    Dual-comb spectroscopy
    33.
    发明授权
    Dual-comb spectroscopy 有权

    公开(公告)号：US11650101B2

    公开(公告)日：2023-05-16

    申请号：US18063217

    申请日：2022-12-08

    Applicant: IRsweep AG

    Inventor： Stéphane Schilt ,  Pierre Brochard ,  Kenichi Komagata ,  Giulio Terrasanta ,  Andreas Hugi

    IPC: H01S5/40 ,  H01S5/062 ,  G01J3/433 ,  G01J3/10 ,  G01J3/42

    CPC classification number: G01J3/433 ,  H01S5/0623 ,  H01S5/4006 ,  G01J2003/102 ,  G01J2003/423 ,  G01J2003/4332

    Abstract: A dual-comb spectrometer comprising two lasers outputting respective frequency combs having a frequency offset between their intermode beat frequencies. One laser acts as a master and the other as a follower. Although the master laser is driven nominally with a DC drive signal, the current on its drive input line nevertheless oscillates with an AC component that follows the beating of the intermode comb lines lasing in the driven master laser. This effect is exploited by tapping off this AC component and mixing it with a reference frequency to provide the required frequency offset, the mixed signal then being supplied to the follower laser as the AC component of its drive signal. The respective frequency combs in the optical domain are thus phase-locked relative to each other in one degree of freedom, so that the electrical signals obtained by multi-heterodyning the two optical signals are frequency stabilized.

    TERAHERTZ SPECTRAL IMAGING SYSTEM AND SECURITY SURVEILLANCE SYSTEM EMPLOYING THE SAME
    34.
    发明申请
    TERAHERTZ SPECTRAL IMAGING SYSTEM AND SECURITY SURVEILLANCE SYSTEM EMPLOYING THE SAME 审中-公开

    公开(公告)号：US20180364158A1

    公开(公告)日：2018-12-20

    申请号：US15628566

    申请日：2017-06-20

    Applicant: KONICA MINOLTA LABORATORY U.S.A., INC.

    Inventor： Leiming Wang ,  Jun Amano

    IPC: G01N21/3581 ,  G06K9/00 ,  G01J3/12

    CPC classification number: G01N21/3581 ,  G01J3/108 ,  G01J3/1256 ,  G01J2003/423 ,  G06K9/0063

    Abstract: A terahertz (THz) spectral imaging system includes a THz 2D imaging camera, a tunable THz bandpass filter before the THz camera, and a broadband THz light source. The tunable THz bandpass filter includes a visible or infrared laser source, a spatial light modulator modulating the light to generate a spatially structured light pattern, and a semiconductor plate onto which the light pattern is projected. The light pattern generates carriers in the semiconductor plate to turn it into a metamaterial THz bandpass filter, which is tunable by changing the light patterns. A controller controls the light patterns and the THz camera in a timing sequence to acquire multiple 2D THz images at different THz frequencies. Such THz spectral image data can be further combined with visible images and LiDAR images in a security surveillance system to automatically detect security threats using image fusion and deep learning techniques.

    MICROSCOPE FOR MOLECULAR SPECTROSCOPIC ANALYSIS
    36.
    发明申请
    MICROSCOPE FOR MOLECULAR SPECTROSCOPIC ANALYSIS 审中-公开

    公开(公告)号：US20180157019A1

    公开(公告)日：2018-06-07

    申请号：US15572111

    申请日：2016-05-06

    Applicant: Baden-Wuerttemberg Stiftung gGmbH

    Inventor： Niels KROEGER-LUI

    IPC: G02B21/00 ,  G01J3/02 ,  G01J3/28 ,  G01J3/42 ,  G02B21/06 ,  G02B21/36

    CPC classification number: G02B21/0004 ,  G01J3/0205 ,  G01J3/2803 ,  G01J3/42 ,  G01J2003/423 ,  G01N21/35 ,  G02B21/0096 ,  G02B21/06 ,  G02B21/361

    Abstract: The invention relates to a microscope for the molecular spectroscopic analysis of a sample (2), having a beam path having at least one quantum cascade laser (QCL) (3) which emits an infrared (IR) radiation, a phase modulator (5) which is arranged between the QCL (3) and the sample (2), at least one optical element (6) which is arranged between the phase modulator (5) and the sample (2) and a sensor (4) which detects an IR radiation which is transmitted and/or reflected by the sample (2). The invention relates further to a method for the molecular spectroscopic analysis of a sample (2) comprising the steps of irradiating the sample (2) with an infrared (IR) radiation by means of a quantum cascade laser (QCL) (3), wherein the IR radiation is directed onto the sample (2) via a phase modulator (5) and at least one optical element (6), and detecting the IR radiation which is reflected and/or transmitted by the sample (2).

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