Raman scattering-based fiber optic temperature sensors rely on the principle of Raman scattering, where light interacts with molecules in the fiber, causing a shift in the frequency of the scattered light. This shift is directly related to the temperature of the fiber. Fiber-optic high-temperature sensors are gradually replacing traditional electronic sensors due to their small size, resistance to electromagnetic interference, remote detection, multiplexing, and distributed measurement advantages. This paper reviews the sensing principle, structural design, and. High-temperature measurements above 1000 °C are critical in harsh environments such as aerospace, metallurgy, fossil fuel, and power production. The sensor consists of: Because optical fibers are dielectric (non-conductive), these sensors are inherently safe in high-voltage, explosive, or.
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