Investigation of the embedded fiber bragg grating temperature sensor

Abstract

An embedded fiber Bragg grating (FBG) sensor, which fabricated in IMS, for temperature sensing was proposed. The temperature responses of the in-fiber Bragg gratings (FBGs) have been investigated. It was found that these responses ranged from 10.6 pm/°C to 12.0 pm/°C. The temperature sensitivity of the FBGs was 0.2°C. The strain responses remained temperature independent over a temperature range of 20 – 180 C. The results obtained are in agreement, within the experimental error, with predictions based on material parameters. Although the temperature response is nonlinear over the temperature range 20 °C to 180 °C, in practical systems the temperature response of the sensor may be assumed to be linear within the temperature range 20 °C to 80 °C.