JPS649341A - Method for preventing interference of laser gas sensor - Google Patents

Method for preventing interference of laser gas sensor

Info

Publication number
JPS649341A
JPS649341A JP16581887A JP16581887A JPS649341A JP S649341 A JPS649341 A JP S649341A JP 16581887 A JP16581887 A JP 16581887A JP 16581887 A JP16581887 A JP 16581887A JP S649341 A JPS649341 A JP S649341A
Authority
JP
Japan
Prior art keywords
enter
signal
moving mirror
laser light
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP16581887A
Other languages
Japanese (ja)
Inventor
Iwao Sugiyama
Akira Sawada
Shoji Doi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16581887A priority Critical patent/JPS649341A/en
Publication of JPS649341A publication Critical patent/JPS649341A/en
Pending legal-status Critical Current

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  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

PURPOSE:To enable the reduction of an effect of light attenuation due to light interference, by using as a detection signal a peak value of each output detection signal of a photodetector obtained every time when a moving mirror is moved. CONSTITUTION:A laser light emitted from a laser diode 10 is made to branch in two by a beam splitter 12, and one is transmitted through a gas atmosphere in a gas cell 2 and made to enter a beam splitter 13, while the other is made to enter a moving mirror 5. The optical path of the laser light reflected by said moving mirror 5 is changed sequentially by reflectors 7 and 8 and made to enter the splitter 13. Accordingly, the laser light from the cell 2 and that from the reflector 8 are synthesized herein and made to enter a detector 3. Besides, a signal processing circuit 15 samples a signal from the detector 3 and supplies same to a concentration calculating circuit 16 so that a differential signal be detected therefrom. This signal is compared with a calibration value, and the concentration of gas is calculated therefrom. In this way, an accurate value whose error due to light interference is reduced can be obtained.
JP16581887A 1987-07-01 1987-07-01 Method for preventing interference of laser gas sensor Pending JPS649341A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16581887A JPS649341A (en) 1987-07-01 1987-07-01 Method for preventing interference of laser gas sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16581887A JPS649341A (en) 1987-07-01 1987-07-01 Method for preventing interference of laser gas sensor

Publications (1)

Publication Number Publication Date
JPS649341A true JPS649341A (en) 1989-01-12

Family

ID=15819578

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16581887A Pending JPS649341A (en) 1987-07-01 1987-07-01 Method for preventing interference of laser gas sensor

Country Status (1)

Country Link
JP (1) JPS649341A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008134076A (en) * 2006-11-27 2008-06-12 Yokogawa Electric Corp Gas analyzer
US8253942B2 (en) * 2007-09-27 2012-08-28 Scott Technologies, Inc. Optical gas detector
US20130135619A1 (en) * 2011-11-28 2013-05-30 Yokogawa Electric Corporation Laser gas analyzer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008134076A (en) * 2006-11-27 2008-06-12 Yokogawa Electric Corp Gas analyzer
US8253942B2 (en) * 2007-09-27 2012-08-28 Scott Technologies, Inc. Optical gas detector
US20130135619A1 (en) * 2011-11-28 2013-05-30 Yokogawa Electric Corporation Laser gas analyzer
US9347877B2 (en) * 2011-11-28 2016-05-24 Yokogawa Electric Corporation Laser gas analyzer

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