| 摘要 |
An optical sensing device, for determining the rotational speed and other parameters of a hydraulic motor, is disclosed. One or more fiber optic cables are led into the interior of the motor, with their ends located where they may be successively covered and uncovered by the moving members of the motor. Each cable contains at least two light paths, isolated so that light can pass from one path into the other only by being reflected from an oil-filled space at the end of the cable. A light input is provided to one path of each cable, and continuity of light is recorded and timed at the other path as an output.
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