| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical fiber interferometer having low sensitivity against an undesirable environmental noise such as a vibration or temperature change. SOLUTION: An optical fiber sensor part 20 is constituted from a storing vessel 21, an optical coupler 23 installed in the storing vessel 21, a pair of optical fibers 24a, 24b laid in the storing vessel 21 and having different lengths, reflecting elements 25a, 25b for laser beam reflection, coupled respectively to the tips of the pair of optical fibers 24a, 24b, and a resin 26 filled in the storing vessel 21.
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