| 摘要 |
A gas concentration measuring module (2X) includes a gas cell (10X) configured to form an introduction space (11X) into which a sample gas (50X) is introduced, an infrared light source (21X) disposed at one end of the gas cell (10X), a reference light receiving element (31X) and a signal light receiving element (32X) disposed at the other end of the gas cell (10X) and configured to receive infrared light emitted from the infrared light source (21X), and an inert gas chamber (40X) disposed on an optical path between the infrared light source (21X) and the reference light receiving element (31X) in the introduction space (11X) and in which an inert gas, inert with respect to the infrared light emitted from the infrared light source (21X) is hermetically enclosed. A calculation circuit (3X) calculates a concentration of carbon dioxide in the sample gas (50X) based on a ratio between an energy value of light received by the reference light receiving element (31X) and an energy value of infrared light received by the signal light receiving element (32X) of the gas concentration measuring module (2X).
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