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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/oC and a temperature resolution less than 0.1 oC are obtained.
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 who 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 / oC and a temperature resolution less than 0.1 oC are obtained.