| 摘要 |
A method and apparatus are described for determining relative amounts of first and second gases in an unknown mixture of gases. Radiant energy is directed serially through reference volumes of the first and second gases and a volume of the unknown gas. The absorption of the radiant energy by the respective gas volumes is varied at different frequencies. The amount of radiant energy passing through the respective gas volumes is detected and a signal is developed representative of the ratio of the amounts of the first and second gases.
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