| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil film detector capable of detecting even a small oil film. SOLUTION: The oil film detector is equipped with a light emitting part 12 for emitting light toward the surface of the water, a light detecting part 13 for detecting the reflected light from the surface of the water and a detection circuit 16 for detecting the presence of the oil film on the surface of the water from the quantity of the reflected light detected by the light detecting part 13. This oil film detector is also equipped with a concave lens 14 for diffusing the light emitted from the light emitting part 12 to irradiate the surface of the water with the diffused light as a diffused beam and a regressive reflector 15 for reflecting incident light towared the surface of the water through a route almost same to an incident route when the reflected light from the surface of the water of the diffused beam is incident. The light reflected by the reflector 5 is reflected on the surface of the water to a converged beam and to transmit through the concave lens 14 to be received by the light detecting part 13. COPYRIGHT: (C)2005,JPO&NCIPI
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