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Engineering Physics by S. Mani Naidu

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11.10 Fibre optic sensing applications

Fibre optic sensors are used to monitor displacement, liquid level, flow, temperature and pressure, chemical composition etc. Optic fibre sensors can be devided into two types, they are:

  1. Intrinsic sensors/active sensors and
  2. extrinsic sensors/passive sensors.

The Active sensors: In active sensors, the quantity to be measured acts directly on the fibre and modifies the radiation passing down the fibre.

The various active sensors are:

(i) Intensity modulated sensors: These are based on the change in refractive index, temperature, absorption, etc

(ii) Phase-modulated sensors: These involve the interference between the signal and reference in the interferometer. This leads to a shift in the interference fringes ...

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