Figure 5. Extrinsic and intrinsic types of fiber optic sensors.
On the other hand, in an intrinsic fiber optic sensor one or
more of the physical properties of the fiber undergo a
change (see Figure 5). Perturbations act on the fiber and
the fiber in turn changes some characteristic of the light
inside the fiber [9].
Based on the operating principle or modulation and
demodulation process, a fiber optic sensor can be
classified as an intensity, a phase, a frequency, or a
polarization sensor. All these parameters may be subject
to change due to external perturbations. Thus, by detecting
these parameters and their changes, the external
perturbations can be sensed [10].
Figure 5. Extrinsic and intrinsic types of fiber optic sensors.On the other hand, in an intrinsic fiber optic sensor one ormore of the physical properties of the fiber undergo achange (see Figure 5). Perturbations act on the fiber andthe fiber in turn changes some characteristic of the lightinside the fiber [9].Based on the operating principle or modulation anddemodulation process, a fiber optic sensor can beclassified as an intensity, a phase, a frequency, or apolarization sensor. All these parameters may be subjectto change due to external perturbations. Thus, by detectingthese parameters and their changes, the externalperturbations can be sensed [10].
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