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    Method and Apparatus for the Spectroscopic Detection of Low Concentrations of Hydrogen Sulfide Gas
    2.
    发明申请
    Method and Apparatus for the Spectroscopic Detection of Low Concentrations of Hydrogen Sulfide Gas 审中-公开

    公开(公告)号：US20180252641A1

    公开(公告)日：2018-09-06

    申请号：US15752877

    申请日：2016-09-01

    Applicant: California Institute of Technology

    Inventor： Ramabhadran Vasudev

    IPC: G01N21/39 ,  G01N21/03

    CPC classification number: G01N21/39 ,  G01J3/42 ,  G01J2003/423 ,  G01N21/031 ,  G01N2021/391 ,  G01N2201/0698

    Abstract: Spectroscopic apparatus and methods incorporating a gas sensor configured to detect low concentration gases, including gases that are hazardous volatiles are provided. Low concentration gases can comprise gases where detection of concentrations on the order of parts-per-million (ppm), and in many embodiments part-per-billion (ppb) is required. The gas may be a species, such as, for example hydrogen sulfide (H2S) that may be produced in drilling and/or volcanic eruptions. The spectroscopic apparatus and methods are configured to operate in particular atmospheres where gas detection can be challenging, such as in ambient air and/or in space where various contaminants may be present. The spectroscopic apparatus and methods may incorporate a long path length detector, such as, for example, a cavity-enhanced absorption spectrometer. The methods and apparatus further incorporate a wavelength modulation technique to improve the signal-to-noise ratio.

    RECONSTRUCTION OF FREQUENCY REGISTRATION FOR QUANTITATIVE SPECTROSCOPY
    3.
    发明申请
    RECONSTRUCTION OF FREQUENCY REGISTRATION FOR QUANTITATIVE SPECTROSCOPY 审中-公开
    重新定量频谱注册

    公开(公告)号：US20170059477A1

    公开(公告)日：2017-03-02

    申请号：US15227876

    申请日：2016-08-03

    Applicant: SpectraSensors, Inc.

    Inventor： Alfred Feitisch ,  Xiang Liu ,  Kevin Ludlum ,  Mathias Schrempel

    IPC: G01N21/27

    CPC classification number: G01N21/274 ,  G01J3/0297 ,  G01J3/28 ,  G01J3/42 ,  G01J3/457 ,  G01J2003/423 ,  G01N21/39 ,  G01N2021/399

    Abstract: Frequency registration deviations occurring during a scan of a frequency or wavelength range by a spectroscopic analysis system can be corrected using passive and/or active approaches. A passive approach can include determining and applying mathematical conversions to a recorded field spectrum. An active approach can include modifying one or more operating parameters of the spectroscopic analysis system to reduce frequency registration deviation.

    Abstract translation: 通过光谱分析系统在频率或波长范围的扫描期间发生的频率对准偏差可以使用无源和/或主动方法进行校正。 被动方法可以包括确定并应用数学转换到记录的场谱。 主动方法可以包括修改光谱分析系统的一个或多个操作参数以减少频率对准偏差。

    Method and system for correcting incident light fluctuations in absorption spectroscopy
    5.
    发明授权
    Method and system for correcting incident light fluctuations in absorption spectroscopy 有权
    用于校正吸收光谱中入射光波动的方法和系统

    公开(公告)号：US09546902B2

    公开(公告)日：2017-01-17

    申请号：US14662307

    申请日：2015-03-19

    Applicant: Servomex Group Limited

    Inventor： Richard P. Kovacich ,  Bahram Alizadeh ,  Ian C. Gaskin ,  James D. Hobby ,  Martin Lopez

    IPC: G01N21/00 ,  G01J3/02 ,  G01J3/10 ,  G01J3/433 ,  G01N21/39 ,  G01N21/27 ,  G01J3/42

    CPC classification number: G01J3/027 ,  G01J3/0297 ,  G01J3/10 ,  G01J3/433 ,  G01J2003/423 ,  G01N21/274 ,  G01N21/39 ,  G01N2021/399 ,  G01N2201/0612 ,  G01N2201/121 ,  G01N2201/1215

    Abstract: A method and system for correcting the effect of intensity fluctuations of the transmitted light in an absorption spectroscopy system used for the detection or measurement of chemical species in a medium, whereby one or more modulation bursts are imposed onto a light beam that passes through the medium. This burst signal may be obtained by modulating the bias current of a tunable diode laser, and the modulation burst signal may be optimally at the second harmonic of the modulation frequency of a wavelength modulated beam to allow usage of the same signal path processing used for the spectroscopic detection of the measurand for a second harmonic detection system. The burst signal can be controlled using a smooth window function to minimise the effects of non-linear perturbations that are inherent in tunable diode laser wavelength modulation spectroscopy systems, of optical interference fringes (etalons) and of the residual light absorption by background chemical species or the measurand at the wavelength coinciding with the modulation burst.

    Abstract translation: 一种用于校正用于检测或测量介质中的化学物质的吸收光谱系统中的透射光的强度波动的影响的方法和系统，由此一个或多个调制脉冲串被施加到通过介质的光束 。 可以通过调制可调二极管激光器的偏置电流来获得该脉冲串信号，并且调制脉冲串信号可以在波长调制波束的调制频率的二次谐波处最佳地进行，以允许使用与 用于二次谐波检测系统的被测量的光谱检测。 可以使用平滑窗函数来控制突发信号，以最小化可调谐二极管激光波长调制光谱系统固有的非线性扰动，光学干涉条纹（标准具）和背景化学物质的残余光吸收的影响， 在波长上的被测量与调制脉冲串一致。

    TUNABLE DIODE LASER ABSORBPTION SPECTROSCOPY WITH WATER VAPOR DETERMINATION
    7.
    发明申请
    TUNABLE DIODE LASER ABSORBPTION SPECTROSCOPY WITH WATER VAPOR DETERMINATION 有权
    具有水蒸气测定的可逆二极管激光吸收光谱

    公开(公告)号：US20140375995A1

    公开(公告)日：2014-12-25

    申请号：US14307995

    申请日：2014-06-18

    Applicant: Rosemount Analytical Inc.

    Inventor： Pawel Kluczynski

    IPC: G01N21/27

    CPC classification number: G01N21/27 ,  G01J3/0205 ,  G01J3/021 ,  G01J3/42 ,  G01J3/433 ,  G01J3/4338 ,  G01J2003/423 ,  G01N21/39

    Abstract: A gas absorption spectroscopy system and method are provided. A sealed chamber is provided with a reference gas having a known moisture concentration. An illumination source is disposed in the sealed chamber and is configured to generate an illumination beam. A measurement cell is coupled to the sealed chamber and is configured for exposure to a gas sample such that illumination travelling through the measurement cell passes through the gas sample. A process window is disposed between the sealed chamber and the measurement cell. The process window is configured to receive the illumination beam from the illumination source and reflect a first portion of illumination while allowing a second portion of illumination to pass into the measurement cell. A reference detector is disposed to receive the first portion of illumination and provide a reference detector signal. A measurement detector is disposed to receive the second portion of illumination after the second portion of illumination has passed through the measurement cell and provide a measurement detector signal. A controller is coupled to the reference detector and the measurement detector and is configured to provide a compensated moisture output based on the reference detector signal and the measurement detector signal.

    Abstract translation: 提供了一种气体吸收光谱系统和方法。 密封室设置有具有已知水分浓度的参考气体。 照明源设置在密封室中并且被配置为产生照明光束。 测量单元耦合到密封室并且被配置为暴露于气体样本，使得穿过测量单元的照明通过气体样本。 处理窗口设置在密封室和测量单元之间。 处理窗口被配置为从照明源接收照明光束并且反射照明的第一部分，同时允许第二部分照射进入测量单元。 设置参考检测器以接收照明的第一部分并提供参考检测器信号。 设置测量检测器以在第二部分照射已经通过测量单元之后接收第二部分照明并提供测量检测器信号。 控制器耦合到参考检测器和测量检测器，并且被配置为基于参考检测器信号和测量检测器信号来提供经补偿的湿度输出。

    BROADBAND OR MID-INFRARED FIBER LIGHT SOURCES
    8.
    发明申请
    BROADBAND OR MID-INFRARED FIBER LIGHT SOURCES 有权
    宽带或中红外光纤光源

    公开(公告)号：US20120239013A1

    公开(公告)日：2012-09-20

    申请号：US13241900

    申请日：2011-09-23

    Applicant: Mohammed N. Islam

    Inventor： Mohammed N. Islam

    IPC: A61B18/22

    CPC classification number: G01J3/108 ,  G01B9/02091 ,  G01J3/0218 ,  G01J3/0245 ,  G01J3/42 ,  G01J2003/102 ,  G01J2003/423 ,  G02B6/29349 ,  G02F1/365 ,  G02F2001/3528 ,  G02F2202/32 ,  H01S3/06725 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/094069 ,  H01S3/094076 ,  H01S3/1024 ,  H01S3/302 ,  H01S5/0064 ,  H01S5/0085 ,  H01S5/0092 ,  H01S5/1092 ,  H01S5/146 ,  H01S5/4012 ,  H01S2301/085

    Abstract: A broadband light source includes one or more laser diodes that are capable of generating a pump signal having a wavelength shorter than 2.5 microns, a pulse width of at least 100 picoseconds and a pump optical spectral width. The light source also includes one or more optical amplifiers that are coupled to the pump signal and are capable of amplifying the pump signal to a peak power of at least 500 W. The light source further includes a first fiber that is coupled to the one or more optical amplifiers. The first fiber including an anomalous group-velocity dispersion regime and a modulational instability mechanism that operates to modulate the pump signal. The light source also includes a nonlinear element that is coupled to the first fiber that is capable of broadening the pump optical spectral width to at least 100 nm through a nonlinear effect in the nonlinear element.

    Abstract translation: 宽带光源包括能够产生波长短于2.5微米的泵浦信号，至少100皮秒的脉冲宽度和泵浦光谱宽度的一个或多个激光二极管。 光源还包括耦合到泵浦信号并且能够将泵浦信号放大到至少500W的峰值功率的一个或多个光放大器。光源还包括第一光纤，其耦合到一个或 更多的光放大器。 第一光纤包括异常组 - 速度色散方案和用于调制泵浦信号的调制不稳定机制。 光源还包括耦合到第一光纤的非线性元件，其能够通过非线性元件中的非线性效应将泵浦光谱宽度扩展至至少100nm。

    Broadband or Mid-Infrared Fiber Light Sources
    9.
    发明申请
    Broadband or Mid-Infrared Fiber Light Sources 有权
    宽带或中红外光纤光源

    公开(公告)号：US20090204110A1

    公开(公告)日：2009-08-13

    申请号：US12366323

    申请日：2009-02-05

    Applicant: Mohammed N. Islam

    Inventor： Mohammed N. Islam

    IPC: A61B18/20 ,  H01S3/30 ,  G01B9/02 ,  G01J3/00 ,  H01S3/10

    CPC classification number: G01J3/108 ,  G01B9/02091 ,  G01J3/0218 ,  G01J3/0245 ,  G01J3/42 ,  G01J2003/102 ,  G01J2003/423 ,  G02B6/29349 ,  G02F1/365 ,  G02F2001/3528 ,  G02F2202/32 ,  H01S3/06725 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/094069 ,  H01S3/094076 ,  H01S3/1024 ,  H01S3/302 ,  H01S5/0064 ,  H01S5/0085 ,  H01S5/0092 ,  H01S5/1092 ,  H01S5/146 ,  H01S5/4012 ,  H01S2301/085

    Abstract: A broadband light source includes one or more laser diodes that are capable of generating a pump signal having a wavelength shorter than 2.5 microns, a pulse width of at least 100 picoseconds and a pump optical spectral width. The light source also includes one or more optical amplifiers that are coupled to the pump signal and are capable of amplifying the pump signal to a peak power of at least 500 W. The light source further includes a first fiber that is coupled to the one or more optical amplifiers. The first fiber including an anomalous group-velocity dispersion regime and a modulational instability mechanism that operates to modulate the pump signal. In one particular embodiment, the pump signal wavelength resides in the anomalous group-velocity dispersion regime of the first fiber and where different intensities in the pump signal can cause relative motion between different parts of the modulated pump signal produced through modulational instability in the first fiber. The light source also including a nonlinear element that is coupled to the first fiber that is capable of broadening the pump optical spectral width to at least 100 nm through a nonlinear effect in the nonlinear element.

    Abstract translation: 宽带光源包括能够产生波长短于2.5微米的泵浦信号，至少100皮秒的脉冲宽度和泵浦光谱宽度的一个或多个激光二极管。 光源还包括耦合到泵浦信号并且能够将泵浦信号放大到至少500W的峰值功率的一个或多个光放大器。光源还包括第一光纤，其耦合到一个或 更多的光放大器。 第一光纤包括异常组 - 速度色散方案和用于调制泵浦信号的调制不稳定机制。 在一个具体实施例中，泵浦信号波长驻留在第一光纤的异常群 - 速度色散方案中，并且其中泵浦信号中的不同强度可引起通过第一光纤中的调制不稳定性产生的调制泵浦信号的不同部分之间的相对运动 。 光源还包括耦合到第一光纤的非线性元件，其能够通过非线性元件中的非线性效应将泵浦光谱宽度扩展至至少100nm。

    Dual-comb spectroscopy
    10.
    发明授权
    Dual-comb spectroscopy 有权

    公开(公告)号：US11796392B2

    公开(公告)日：2023-10-24

    申请号：US18063213

    申请日：2022-12-08

    Applicant: IRsweep AG

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

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

    CPC classification number: G01J3/433 ,  G01J3/10 ,  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.

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