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Title:
INFRARED GAS ANALYZER
Document Type and Number:
Japanese Patent JP3291934
Kind Code:
B2
Abstract:

PURPOSE: To eliminate the effect of interference even when the sensitivity of an interference component is large, by using a front-rear chamber-type detector.
CONSTITUTION: Two light-sensing chambers 20 and 22 of a front-rear chamber- type detector 21 is separated by an electrostatic microphone 24 and a pressure difference between the two light-sensing chambers 20 and 22 is detected. The front chamber 20 and the rear chamber 22 are made to communicate with each other by a slow leak 26 and thereby a gas pressure between the two chambers 20 and 22 is balanced. In addition to SO2 as a measuring component gas, C3H6 which is used as a substitute gas for H2O as an interference component gas having an infrared absorption wavelength overlapping with the one of SO2 and is diluted with Ar is filled in the front chamber 20 and the rear chamber 22. The interference sensitivity in the rear chamber 22 is set to be equal to or larger than that in the front chamber 20, and in the case when the interference gas sensitivity in the rear chamber 22 is larger, the interference sensitivity is made equal in the two chambers 20 and 22 by regulating a trimmer 28.


Inventors:
Araya, Katsuhiko
Application Number:
JP1994000232352
Publication Date:
June 17, 2002
Filing Date:
August 31, 1994
Export Citation:
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Assignee:
SHIMADZU CORP
International Classes:
G01N21/35; G01N21/3504; G01N21/37; G01N21/61; (IPC1-7): G01N21/37
Attorney, Agent or Firm:
野ċ£ çıé›„



 
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