The constant intensity of the light signal is modulated by the external temperature as it travels through the optical fiber cable. Alternatively, it is possible to measure the temperature near the fiber tip using distributed sensing techniques that provide information on the temperature variation hnique and demonstrate its feasibility in a simple. According to the temperature measurement principle, fiber-optic sensors can be divided into blackbody radiation sensors, fluorescence-based sensors, interferometric sensors, fiber Bragg grating (FBG) sensors, and distributed temperature sensors (DTS).
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