| 摘要 |
PROBLEM TO BE SOLVED: To eliminate an interferences due to interference components when detecting multi-components, and suppress the lowering of gas measurement sensitivity with a detector arranged at subsequent stage as well. SOLUTION: Three pneumatic type detectors D1, D2 and D3 are arranged in series on the light path 3 of an infrared light transmitting a cell 4, with the detector D1, the detector D2, and the detector D3 filled respectively with NO, CO, and SO<SB>2</SB>. At the subsequent stages of each detector D1, D2, and D3, filters F1, F2, and F3 are arranged respectively. Since the filter F1 reflects only the band of NO infrared absorption wavelength of 5.4μm, upon using an optical filter for transmitting wavelengths around the band, infrared absorption wavelength of 4.7μm by the detector D2 sealed with CO at the subsequent stage and infrared absorption wavelength of 7.3μm by the detector D3 sealed with SO<SB>2</SB>are transmitted, so that infrared absorption wavelengths necessary to be detected by the detectors D2, D3 enter the detectors D2, D3 with almost no loss. COPYRIGHT: (C)2004,JPO
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