| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas absorbance measuring device that can obtain accurate concentration of a specific gas component in a sample gas by eliminating an influence even if such a phenomenon occurs that influences transmitted light intensity of a sample cell within the sample cell.SOLUTION: A gas absorbance measuring device 10 comprises: a sample cell 12 storing a sample gas therein; a first light source 14 emitting a laser beam of the same wavelength as an absorption wavelength of a target component contained in the sample gas; a second light source 16 emitting a laser beam of a different wavelength from the absorption wavelength of the target component; and a coupling optical system causing the laser beam emitted from the first light source 14 and the laser beam emitted from the second light source 16 to transmit through the same optical path in the sample cell 12. A first detector 221 detects the intensity of the laser beam from the first light source 14, of the beams passing through the sample cell 12, and a second detector 222 detects the intensity of the laser beam from the second light source 16, of the beams passing through the sample cell 12. Using a detection signal of the second detector 222, a detection signal of the first detector 221 is corrected. |
