| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas-concentration measuring apparatus whose structure is simple and by which the concentration of a gas to be measured can be measured even by a simple apparatus irrespective of whether the concentration is high or low. SOLUTION: A gas-concentration measuring apparatus 10 is installed in such a way that a beam of light which is supplied from a light source 12 is separated by a parallel plane mirror 13 into a first beam of reflected light a'1, a second beam of reflected light a'2 and a third beam of reflected light a'3, that the beam of reflected light a'3 out of them is passed through a standard gas chamber 15a and that the beams of reflected light a'1, a'2 can be passed through a gas-to-be-measured chamber 15b. Consequently, two beams of composed light h'1, h'2 can be generated so as to generate two kinds of interference fringes. When the concentration of a gas to be measured is high, the concentration is specified by the interference fringes of one kinds, and, when the concentration is low, the concentration can be specified on the basis of the interference fringes of the other kinds.
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