Patent ID: 7351954
Filing Date: 2008-04-01
Classification: G01N

Abstract:
1. A method for detecting gas concentration with infrared absorption characteristics, comprising the following steps: a. feeding gas containing a certain amount of gas to be detected into a detecting chamber in a detecting light path; b. transmitting an infrared light containing a specific wavelength λ through the detecting chamber, so as to generate an infrared light signal reflecting concentration information of the gas to be detected, wherein the gas to be detected has maximum absorption to the infrared light at the specific wavelength λ; c. processing the infrared light signal which passed through the detecting chamber, so as to obtain a measured value C d. computing a calibrated value C of the concentration of the gas to be detected according to a formula C=C wherein the calibration factor β is obtained by a calibration step of: switching a reference chamber filled with a reference gas having a known concentration value C