Abstract
Temperature sensitivity is greatly improved by taking the following three measures: proper long-period fiber grating (LPFG) whose strain coefficient of the core is larger than that of the cladding is employed, the LPFG is coated with a thin film of the material whose refractive index decreases with the temperature, and the sensor is encapsulated by metal material whose thermal expansion coefficient is large. By computer simulation, a measured temperature coefficient of 0.2375 nm/°C and a temperature resolution less than 0.1 °C are obtained.
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This work is financially supported by the Innovation Project of Guangxi Graduate Education Foundation (No.200710602 0809M70).
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Ruan, Ja., Zeng, Qk., Qin, Zx. et al. High-sensitivity temperature sensor based on long-period fiber grating. Optoelectron. Lett. 4, 114–116 (2008). https://doi.org/10.1007/s11801-008-7133-4
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DOI: https://doi.org/10.1007/s11801-008-7133-4