FIBRE-OPTIC SENSORS
One of the most exciting applications of optical fibres is fibre-optic sensors.A Sensor is transducer which converts one form of energy(physical variable) into another.The Sensors find wide applications in sensing and measuring acoustic fields,magnetic fields,current, rotation,acceleration, strain,presure,temperature and so on.
TYPES OF SENSORS
There are two types of Sensors.They are
1.Intrinsic Sensors (or) Active sensors
2.Extrinsic Sensor (or)Passive sensors
1.Intrinsic Sensors(or) Active Sensors:
In intrinsic sensors(or)active sensors,the physical parameter to be sensed directly acts on the fibre itself to produce the changes in the transmission characteristics.
Examples
I)Pressure sensors(Phase and polarization sensor)
II)Liquid level sensor
2.Extrinsic sensors(or)Passive sensors:
In extrinsic sensors(or) passive sensors,separate sensing element is used and the fibre acts as a guiding media to the sensors.
Examples:
I)Displacment sensor and
II)Laser doppler velocimeter sensor
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