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1. JP2022024437 - GAS CONCENTRATION DETECTOR

Office
Japan
Application Number 2020127036
Application Date 28.07.2020
Publication Number 2022024437
Publication Date 18.05.2021
Grant Number 6886208
Grant Date 18.05.2021
Publication Kind B1
IPC
G01N 21/33
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
33using ultra-violet light
CPC
G01N 21/33
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
33using ultra-violet light
G01N 21/3504
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
35using infra-red light
3504for analysing gases, e.g. multi-gas analysis
G01N 21/01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
01Arrangements or apparatus for facilitating the optical investigation
Applicants TRUSTEC AICHI CORP
株式会社トラステック愛知
Inventors SHIBATA OSAMU
柴田 修
TSUJI TAKEHIKO
辻 武彦
Agents 森岡 智昭
特許業務法人コスモス国際特許商標事務所
Title
(EN) GAS CONCENTRATION DETECTOR
(JA) ガス濃度検知装置
Abstract
(EN)

PROBLEM TO BE SOLVED: To provide a gas concentration detector capable of appropriately detecting the concentration of a target gas in the gas to be measured, without having to frequently update calibration coefficients using a standard gas and a clean gas.

SOLUTION: A gas concentration detector 1 includes a calibration dimming filter 23F that causes light intensity 22OLI of emission light 22OL reaching an emitted light detection unit 24 to decrease. A signal processing unit 25 acquires a concentration ch of a target gas GJ in a gas GH to be measured, from: a calibration signal SC obtained when a gas container 22 is filled with a clean gas GA and the light intensity of emitted light is reduced by the calibration dimming filter; a clean gas signal SA obtained when the gas container is filled with the clean gas and the light intensity is not reduced by the calibration dimming filter; a measured-gas signal SH obtained in tandem with the calibration signal SC and the clean gas signal SA, and obtained when the gas container 22 is filled with the gas GH to be measured and the light intensity is not reduced by the calibration dimming filter; and a calibration coefficient kf given to the calibration dimming filter.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT


(JA) 【課題】頻繁に標準ガスと清浄ガスを用いて校正係数を更新しなくとも、適切に被測定ガス中の目標ガスの濃度を検知できるガス濃度検知装置を提供すること。
【解決手段】ガス濃度検知装置1は、出射光検出部24に届く出射光22OLの光強度22OLIを減少させる校正減光フィルタ23Fを備え、信号処理部25は、ガス容器22が清浄ガスGAで満たされ、かつ、校正減光フィルタで出射光の光強度を減少させたときに得られる校正信号SCと、ガス容器が清浄ガスで満たされ、かつ、校正減光フィルタによる減光を生じさせないときに得られる清浄ガス信号SAと、校正信号SC及び清浄ガス信号SAと相前後して得られ、ガス容器22が被測定ガスGHで満たされ、かつ、校正減光フィルタによる減光を生じさせないときに得られる被測定ガス信号SHと、校正減光フィルタに与えられた校正係数kfとから、被測定ガスGH中の目標ガスGJの濃度chを取得する。
【選択図】図1

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