Applied Physics I: Chapter 9: Applied Optics - Fiber Optics
Displacement Sensor (Extrinsic sensor)
Principle, Description, Working | Fibre optic sensors
Light is sent through a transmitting fibre and is made to fall on a moving target.
DISPLACEMENT
SENSOR (EXTRINSIC SENSOR)
Principle
Light
is sent through a transmitting fibre and is made to fall on a moving target.
The reflected light from the target is sensed by a detector. With respect to
intensity of light reflected from it, the displacement of the target is
measured.
Description
It
consists of a bundle of transmitting fibres coupled to the laser source and a
bundle of receiving fibres coupled to the detector as shown in Fig. 9.10. The
axis of the transmitting fibre and the receiving fibre with respect to the
moving target can be adjusted to increase the sensitivity of the sensor.
Working
Light
from the source is transmitted through the transmitting fibre and is made to
fall on the moving target. The light reflected from the target is made to pass
through the receiving fibre and the same is detected by the detector. Based on
the intensity of light received, the displacement of the target can be
measured, (i.e.) If the received intensity is more, then we can say that the
target is moving towards the sensor and if the intensity is less, we can say
that the target is moving away from the sensor.
Applied Physics I: Chapter 9: Applied Optics - Fiber Optics : Tag: Applied Physics : Principle, Description, Working | Fibre optic sensors - Displacement Sensor (Extrinsic sensor)
Applied Physics I: Chapter 9: Applied Optics - Fiber Optics
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