| 摘要 |
1530923 Gas analysis UNITED TECHNOLOGIES CORP 18 Dec 1975 [19 Dec 1974] 51954/75 Heading G1A A system for measuring the amount of a contaminant in a sample gas comprises means for generating an infrared beam, means 12, 14, 16, 26 for passing a sample gas through cell 28 and means for passing the beam alternately through sample and reference cells 28, 34, and detector means giving two electrical signals respectively indicative of infrared absorption therein by the contaminant and means 24 computing from these signals an output signal giving the amount of contamination in a sample gas; means 40, 44 measuring sample gas temperature and ambient pressure respectively and means (in means 24) for compensating the output signal therefor. Thermistor 40 is located in the outlet 38 of cell 28. The output signal is compensated by multiplying by K 1 + K 2 TG-K 3 PA where PA and TG are the pressure and gas temperature signal values and K 1 , K 2 , K 3 are constants. The embodiments are the same as in Specification 1530922. |
