Definition:
Displacement sensor is use to sense and measure the displacement of the object.
Principle:
Light is sent through a transmitting fiber and is made to fall on a moving target.The reflected beam from the target is sensed by a detector with respect to intensity of light reflected from it and hence the displacement of the target is measured.
Construction:
This type of sensor consists of a bundle of transmitting fibers coupled to a laser source and a bundle of receving fibers coupled to a detector as shown below.
Working:
To measure the displacement of the target,first light from the source is transmitted through the transmitting fiber and it is made to fall on the moving target.
The reflected beam from the target is made to pass through the receiving fiber and this light is detected by the detector.The intensity of the light received back depends on the displacement of the target.
If received intensity increases,it indicates thatthe target is moving towards the sensor.But if the intensity of light received inceases,it indicates that the target is moving away from the sensor.
Thus the displacement of the target can be measured from the intensity of the light received.
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