| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil film detection device capable of certainly and accurately detecting an oil film even when distance with the water surface (detection object surface) is separated.SOLUTION: In an oil film detection device which includes: an accommodation part 25 which accommodates at least a light source 21, a concave mirror 22, and a light receiving part 24; and a window 26 which water-tightly seals the accommodation part 25 in a detector 20, and detects an oil film existing on a detection object surface by irradiating light from the light source 21 toward the detection object surface, condensing reflected light from the detection object surface by the concave mirror 22 to be received by the light receiving part 24, the light source 21 is arranged at an upper part of the concave mirror 22, emits light approximately in the perpendicular direction, the concave mirror 22 is arranged so that an optical axis of the concave mirror 22 is orthogonal to the horizontal direction, and has a through hole 23 for passing through emitted light from the light source 21 at a position shifted from the optical axis of the concave mirror 22, and the light receiving part 24 is arranged at a focal position on the optical axis of the concave mirror 22. |
