Applied Physics I: Chapter 9: Applied Optics - Fiber Optics
Temperature or pressure sensor or Phase and polarization sensor (Intrinsic sensor)
Principle, Description, Working | Fibre optic sensors
It is based on the principle of Interference between the beams emerging out from the reference fibre and the fibre kept in the measuring environment.
TEMPERATURE / PRESSURE
SENSOR (OR) PHASE AND POLARIZATION SENSOR - (INTRINSIC SENSOR)
Principle
It
is based on the principle of Interference between the beams emerging out from
the reference fibre and the fibre kept in the measuring environment.
Description
It
consists of a Laser source to emit light. A beam splitter, made of glass plate
is inclined to an angle of 45° with respect to the direction of the laser beam.
Two fibres viz.,
(i) Reference fibre
which is isolated from the environment and
(ii) Test fibre
kept in the environment to be sensed, are placed as shown in Fig.9.9. Separate
lens systems are provided to split and to collect the beam.
Working
1.
A monochromatic source of light is emitted from the laser source.
2.
The beam splitter kept at 45° inclination divides the beam emerging from the
laser source into two beams (i) Main beam and (ii) Splitted beam, exactly at
right angles to each other.
3.
The main beam passes through the lens L1 and is focussed onto the
reference fibre which is isolated from the environment to be sensed.
4.
The beam, after passing through the reference fibre, falls on the lens L2.
5.
The splitted beam passes through the lens L3 and is focussed onto
the test fibre kept in the environment to be sensed.
6.
The splitted beam after passing through the test fibre is made to fall on the
lens L2.
7.
The two beams after passing through the fibres, produces a path difference, due
to the change in parameters such as pressure, temperature etc., in the
environment.
8.
Therefore a path difference is produced between the two beams, causing the
interference pattern as shown in Fig.9.9.
9.
Thus
the change in pressure (or) temperature can be accurately measured with the
help of the interference pattern obtained.
Applied Physics I: Chapter 9: Applied Optics - Fiber Optics : Tag: Applied Physics : Principle, Description, Working | Fibre optic sensors - Temperature or pressure sensor or Phase and polarization sensor (Intrinsic sensor)
Applied Physics I: Chapter 9: Applied Optics - Fiber Optics
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