Abstract: In this paper, a fiber optic sensor system (FOSS) is proposed for the measurement of the rotational speed of a DC motor. It offers non-contact measurements. FOSS is designed using a fiber optic displacement sensor (FODS). FODS is an intensity modulation based extrinsic type sensor.
In FOSS, the distance between the sensor probe and the rotating shaft of a DC motor is optimized based on the response of FODS. The speed of a DC motor varied from 200 to 3000 rotations per minute (RPM) using a chopper motor controller. The output of FOSS was validated with a digital tachometer from Systems.
Keywords: Fiber optic sensor; Intensity modulation; Plastic optical fiber; Revolutions per minute.
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