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    CONCENTRATION MEASURING METHOD, AND CONCENTRATION MEASURING DEVICE
    4.
    发明申请
    CONCENTRATION MEASURING METHOD, AND CONCENTRATION MEASURING DEVICE 有权

    公开(公告)号：US20230124208A1

    公开(公告)日：2023-04-20

    申请号：US17905486

    申请日：2021-03-04

    Applicant: TOKUSHIMA UNIVERSITY ,  FUJIKIN INCORPORATED

    Inventor： Yoshihiro DEGUCHI ,  Masaaki NAGASE ,  Kouji NISHINO ,  Nobukazu IKEDA

    IPC: G01N21/27 ,  G01N21/3504 ,  G01N21/31

    Abstract: A concentration measurement method performed in a concentration measurement device including an electric unit having a light source and a photodetector, a fluid unit having a measurement cell through which a gas flows, and a processing circuit for calculating a concentration of the gas based on an intensity of a light passing through the measurement cell. The concentration measurement method includes a step of determining an absorption coefficient of the measurement gas using a reference absorption coefficient determined in association with the reference gas and a correction factor associated with the measurement gas, and a step of obtaining a concentration of the measurement gas flowing in the measurement cell using the absorption coefficient of the measurement gas. When the absorption peak wavelength of the measurement gas is longer than the peak wavelength of the light source, a reference gas having a longer absorption peak wavelength than the peak wavelength of the light source is used, and when the absorption peak wavelength of the measurement gas is shorter than the peak wavelength of the light source, a reference gas having a shorter absorption peak wavelength than the peak wavelength of the light source is used.

    Apparatus and method of gas analysis using laser light
    7.
    发明授权
    Apparatus and method of gas analysis using laser light 有权

    公开(公告)号：US10302563B2

    公开(公告)日：2019-05-28

    申请号：US14913296

    申请日：2014-08-21

    Applicant: Tokushima University

    Inventor： Yoshihiro Deguchi ,  Takahiro Kamimoto

    IPC: G01N21/61 ,  G01N21/3504 ,  G01J3/427 ,  G01N21/31 ,  G01N21/39 ,  G01J5/00 ,  G01J3/433 ,  G01J5/60 ,  G01K11/18 ,  G01K11/00

    Abstract: A gas analyzing apparatus includes first and second laser sources that output first and second laser lights, a laser controller that controls the first and second laser sources to vary wavelengths of the first and second laser lights in the respective predetermined wavelength ranges, an optical multiplexer that multiplexes the first and second laser lights to transmit the multiplexed laser light to a target gas, an optical receiver that receives the laser light transmitted through the target gas, and an analyzer that analyzes a temperature and/or a concentration of the target gas based on an electric signal output from the optical receiver. While varying the wavelengths of the laser lights, the laser controller controls amplitudes of the first and second laser lights to differ from each other and varies intensities of the first and second laser lights in the opposite direction.

    Inline concentration measurement device
    9.
    发明授权
    Inline concentration measurement device 有权

    公开(公告)号：US10222323B2

    公开(公告)日：2019-03-05

    申请号：US15321398

    申请日：2015-07-23

    Applicant: TOKUSHIMA UNIVERSITY ,  FUJIKIN INCORPORATED

    Inventor： Yoshihiro Deguchi ,  Masaaki Nagase ,  Nobukazu Ikeda ,  Michio Yamaji ,  Tadayuki Yakushijin

    IPC: G01N21/27 ,  G01N21/05 ,  G01N21/15

    Abstract: An inline concentration measurement device comprises: a measurement cell main body with a gas flow path formed; a light incident part with a window member connected to the main body; and a light receiving part with a window member connected to the main body, wherein the gas flow path includes a gas flow path for an optical path extending straight between the window members of the light incident part and the light receiving part, a first communication part making a gas inlet formed in the main body communicate with the gas flow path part for the optical path, and a second communication part making a gas outlet formed in the main body communicate with the gas flow path part for the optical path, and the first communication part obliquely extends from the gas inlet towards the window member of the light incident part.

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