Multiplexing of fiber-optic sensors

Fiber-optic sensors are opening up a variety of applications for the sensing of parameters such as temperature, pressure, strain, acoustic signals, chemical concentration, electric and magnetic fields, rotation, and many others. Some sensors use optical fibers only as a light pipe to deliver optical signals to separate optical sensors; others use optical fibers as a sensing medium as well. In the most sensitive type of fiber-optic sensors, the environmental parameters of interest modify the phase of the optical wave propagating in an optical fiber monitored by interferometric measurements. Interferometric fiber-optic sensors are constructed with single-mode fibers, high birefringence fibers, and two-mode fibers.

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