| 摘要 |
1,083,876. Photo-electric gas analysis. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. March 23, 1965 [March 26, 1964], No. 12226/65. Headings G1A and G1B. Carbon containing gases are detected by mixing with oxygen-free nitrogen which has been rendered monatomic and raised to an excited state by an electric discharge. Characteristic radiation from the CN radical is detected. The chamber 20 is filled with nitrogen at one atmosphere and a discharge set up between the copper extensions 19, 9 on silver electrodes 3, 4. The gas under test is introduced into chamber 20 and carbon compounds therein form CN radicals emitting light through the quartz windows 5. A filter 12 allows light of wavelength 3, 880Š, characteristic of CN, to reach a photo-multiplier 14, the output of which is indicated on a meter 16. |
