About the fiber optic sensors
The basis of operation of fiber optic
sensors is the translation of the physical quantity measured into a
change in one or more parameters of a light beam. The light parameters
that can be modulated are one or more of the following:
Fiber optic sensors usually incorporate either glass/plastic cables or all-plastic cables. All-glass types are rarely used because of their fragility. Plastic cables have particular advantages for sensor applications because they are cheap and have a relatively large diameter of 0.5-1.0 mm, making connection to the transmitter and receiver easy. However, plastic cables should not be used in certain hostile environments where they may be severely damaged. The cost of the fiber optic cable itself is insignificant for sensing applications, as the total cost of the sensor is dominated by the cost of the transmitter and receiver.
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