High-sensitivity temperature sensor based on long-period fiber grating

Ju-an Ruan; Qing-ke Zeng; Zi-xiong Qin; Wei-yuan Liang; Ping Huang

doi:10.1007/s11801-008-7133-4

Optoelectronics Letters ›› 2008, Vol. 4 ›› Issue (2) DOI: 10.1007/s11801-008-7133-4

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High-sensitivity temperature sensor based on long-period fiber grating

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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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Ju-an Ruan, Qing-ke Zeng, Zi-xiong Qin, Wei-yuan Liang, Ping Huang. High-sensitivity temperature sensor based on long-period fiber grating. Optoelectronics Letters, 2008, 4(2): DOI:10.1007/s11801-008-7133-4

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