| 摘要 |
PROBLEM TO BE SOLVED: To eliminate errors caused by a difference in the amounts of water vapor in reference gas and sample gas. SOLUTION: The sample gas or the reference gas is provided from a gas introduction port 1a to a testpiece cell 1 via a three-way valve 7 and exhausted from a gas exhaust port 1b. An electronic cooler 10 for cooling and removing vapor in the gas is mounted at a flow passage between the three-way valve 7 and the testpiece cell 1 and the sample gas and the reference gas provided from the three-way valve 7 are introduced to the sample cell 1 via the electronic cooler 10. A light source 5 for emitting infrared light is provided at an end of the testpiece cell 1 and a detector 2 for detecting infrared light passed through the testpiece cell 1 is provided at the other end of the testpiece cell 1 and a sector 3 for interrupting the infrared light is provided between the light source 5 and the end part of the testpiece cell 1. COPYRIGHT: (C)2004,JPO
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