Patent ID: 7057175
Filing Date: 2006-06-06
Classification: G01N

Abstract:
1. An infrared absorption measurement method comprising: (a) measuring infrared absorption of a measurement target component in a state in which a sample gas including the measurement target component is decompressed; (b) calculating an absorption area in a peak region of the measurement target component in the infrared absorption shown in a graph which shows the relationship between the wave number and absorbance of the sample gas; (c) calculating a concentration of the measurement target component in the sample gas based on the absorption area and pressure of the sample gas during decompression; (d) measuring the infrared absorption of the measurement target component in the sample gas under pressure differing from the pressure of the sample gas in the step (a); (e) calculating the absorption area based on the peak region of the measurement target component in the infrared absorption measured in the step (d); (f) calculating the concentration of the measurement target component in the sample gas based on the absorption area calculated in the step (e) and the pressure of the sample gas in the step (d); and (g) comparing the concentration of the measurement target component calculated in the step (c) with the concentration of the measurement target component calculated in the step (f).