| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical sensor suppressing the lack of immediacy.SOLUTION: A lubricating oil degradation sensor 10, as one example of an optical sensor, comprises: a white LED 52 as one example of a light-emitting element; an RGB sensor 53 as one example of a light receiving element; and a clearance formation member 40 as one example of a permeation part in which an oil clearance 40a serving as a clearance for receiving a lubricating oil 91 is formed. The clearance formation member 40 transmits therethrough light emitted by the white LED 52, and the oil clearance 40a is arranged on an optical path from the white LED 52 to the RGB sensor 53. |
