| 摘要 |
PURPOSE: An optical gas sensor and an optical cavity are provided to maximize the length of an optical path and remove the necessity of accurate alignment of the optical path. CONSTITUTION: An optical gas sensor(1) includes a light source, a light receiving element, a frame, and a partition. The light source(11) generates the light of a specific wavelength band. The light receiving element(20) can light receive the light of the specific wavelength band. The frame(30) performs a function of guiding the light generated in the light source up to the light receiving element. The inner surface of the frame is made of the mirror(31).
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