| 摘要 |
PROBLEM TO BE SOLVED: To provide a two-liquid leakage sensor using a prism for detecting kinds and existence of liquid for water and oil etc., separately, excellent in safety and simple in configuration and capable of manufacturing at a low cost using a prism having a refraction index same as that of the detecting liquid or approximately same as that of the detection liquid. SOLUTION: The two-liquid leakage sensor includes: a light emitter for irradiation with the light, a first optical fiber for guiding the light to the light emitter, and the prism provided with a light incident surface and a light exit surface, where the light enters an incident surface and out going from an exit surface, first and second light receiving parts arranged on the two places for receiving the light out going from the exit surfaces, the first and the second light receiving parts for receiving the light introduced by second and third optical fibers. According to the existence of the light receiving, or the light receiving amount by the first and the second light receivers, existence of leakage liquid soaking the prism and whether the leakage liquid is the prescribed liquid or not is informed of. COPYRIGHT: (C)2009,JPO&INPIT
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