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    GENERAL NOISE SUPPRESSION SCHEME WITH REFERENCE DETECTION IN OPTICAL HETERODYNE SPECTROSCOPY
    343.
    发明申请
    GENERAL NOISE SUPPRESSION SCHEME WITH REFERENCE DETECTION IN OPTICAL HETERODYNE SPECTROSCOPY 审中-公开

    公开(公告)号：US20180283950A1

    公开(公告)日：2018-10-04

    申请号：US15941510

    申请日：2018-03-30

    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA

    Inventor： Nien-Hui Ge ,  Yuan Feng ,  Ilya Vinogradov

    IPC: G01J3/45 ,  G01J3/02

    CPC classification number: G01J3/45 ,  G01J3/027 ,  G01J3/433 ,  G01J9/04

    Abstract: A heterodyne optical spectroscopy system comprises a light source that acts as a local oscillator (LO); a beam splitting component that generates a reference beam from the LO; a signal component that generates a sample signal from a sample; a beam blocker that can turn off the sample signal to generate blank shots; a composite signal detection subsystem that detects a heterodyned signal that is a mix of the sample signal and a portion of the LO; a composite reference detection subsystem synchronized to the signal detection subsystem to detect a portion of the reference beam; and a processor that processes digital signals from the signal detection subsystem and the reference detection subsystem. A very versatile reference scheme is developed to treat different heterodyne spectroscopies in a unified way, which achieves optimal noise suppression.

    METHODS AND APPARATUS FOR ON-CHIP DERIVATIVE SPECTROSCOPY
    344.
    发明申请
    METHODS AND APPARATUS FOR ON-CHIP DERIVATIVE SPECTROSCOPY 审中-公开

    公开(公告)号：US20180209899A1

    公开(公告)日：2018-07-26

    申请号：US15874956

    申请日：2018-01-19

    Applicant: Hong Kong Applied Science and Technology Research Institute Company Limited

    Inventor： Jiaqi WANG ,  Chun ZHANG ,  Wei Mong TSANG

    IPC: G01N21/27 ,  G01N21/25

    CPC classification number: G01N21/255 ,  G01J3/0286 ,  G01J3/12 ,  G01J3/433 ,  G01J2003/1265 ,  G01N21/359

    Abstract: A derivative spectroscopy system for achieving a tunable resolution of 2 nm or less in resolving spectral components of an input optical signal is provided so as to estimate derivative spectra of the input optical signal based on the resolved spectral components. In the system, a first dispersive-element structure spectrally decomposes the input optical signal into subband signals. A second dispersive-element structure receives part or all of the subband signals and spectrally decomposes the received subband signals to plural spectral components. A material having a temperature-variant refractive index is used to build the second dispersive-element structure, enabling a shift of center wavelength of each spectral component as small as 2 nm of less upon changing a temperature of the second dispersive-element structure. By obtaining three spectral-component sets obtained at three different predetermined temperatures with the center-wavelength shift of 2 nm or less, first- and second-order derivative spectra are obtained with good accuracy.

    Absorption Spectrometer
    346.
    发明申请
    Absorption Spectrometer 审中-公开

    公开(公告)号：US20180003624A1

    公开(公告)日：2018-01-04

    申请号：US15537052

    申请日：2015-12-02

    Applicant: Siemens Aktiengesellschaft

    Inventor： Franz STEINBACHER

    IPC: G01N21/3504 ,  G01N21/39 ,  G01J3/10 ,  G01J3/433

    CPC classification number: G01N21/3504 ,  G01J3/108 ,  G01J3/433 ,  G01J3/4338 ,  G01N21/39 ,  G01N2021/399 ,  G01N2201/0612 ,  G01N2201/068

    Abstract: An absorption spectrometer which measures a gas component concentration in a measured gas and which operates via wavelength modulation spectroscopy, wherein the light wavelength of a wavelength-tunable light source is periodically varied over a gas component absorption line of interest and simultaneously sinusoidally modulated with a high frequency and a low amplitude signal, and wherein the measurement signal of a detector is demodulated in a phase-sensitive manner at the frequency and/or a harmonic of the frequency and further analyzed, where modulation starts in each period or each n-th period with the frequency in a time interval before the beginning of the time function and is performed with a higher amplitude than during the time function to demodulate the measurement signal in a phase-synchronous manner, where a device provided for the phase-sensitive demodulation is synchronized during the time interval such that a cable for transmitting synchronization signals is no longer necessary.

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