Patent ID: 7655910
Filing Date: 2010-02-02
Classification: G01N

Abstract:
1. An apparatus for gas concentration measurement according to a gas correlation method, characterized in that it comprises: an infrared light source made of an infrared light emitting diode; a collimator for collimating infrared light generated from the infrared light source; a gas correlation filter on which infrared light collimated by the collimator is incident; a multi-reflection sample gas cell on which infrared light passing through the gas correlation filter is incident and in which a gas to be measured containing a plurality of analyte gases is introduced or charged; and an infrared detector for detecting an intensity of infrared light passing through the multi-reflection sample gas cell, wherein: said infrared light source has an infrared light emission band wider than and close to infrared absorption bands of the analyte gases; said gas correlation filter comprises a reference gas cell and a plurality of probe gas cells corresponding in number to a plurality of said analyte gases; said reference gas cell and said probe gas cells are arranged so that the infrared light collimated as aforesaid passes successively through said reference gas cell and said probe gas cells, respectively; and said reference gas cell is filled with all of said analyte gases while each individual of said probe gas cells is filled with all such analyte gases other than one of said analyte gases which is of its particular interest, whereby concentrations of said analyte gases contained in said gas to be measured are measured at high sensitivity and simultaneously.