Highly accurate temperature sensor using two fiber bragg gratings

Abstract

A new highly accurate temperature sensor for biomedical applications is proposed in this paper. The sensor, including two fiber Bragg gratings with different thermal coefficients, can accurately measure temperature with little laser frequency stabilization. A general theoretical model is established and the performance is analyzed. Some numerical examples from 0.1 °C to 10 °C temperature shift around human body temperature are presented. The novel method immunizes temperature sensing against the frequency drifting of light source.