The Role of Frequency Modulated Fiber Optic Sensors
Fiber-optic sensors employ light propagating through an optical fiber to detect an environmental parameter. In principle, any property of the light, such as in-tensity, color, frequency, phase, or polarization state, can be used t. The sensor primarily consists of a Y-type single-mode fiber coupler (FC) stuck to a quarter-pitch gradient-index lens (GL) at the distant end of its output fiber. Strain and stress measurements are established, but active, topics in mechanical engineering. Fiber-optic temperature sensors are particularly useful in electrical transform-ers, jet engines, and certain medical treatments because they are isolative in electricity, passive in chemistry, small in size, and light in weight.
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