Temperature sensing based on chaotic correlation fiber loop ring down system

摘要

In this paper, we describe a novel temperature sensing system based on chaotic correlation fiber loop ring down technique. A fiber Bragg grating is introduced into the fiber loop cavity. The effect of temperature on the central wavelength of fiber Bragg grating is characterized by the ring down time of the autocorrelation coefficient of chaotic laser in the fiber loop cavity. The relationship between the autocorrelation coefficient ring down time of the chaotic laser and wavelength shifting of the fiber Bragg gratings induced by temperature is theoretically and experimentally analyzed. The sensitivity of 3.52 ns/degrees C is achieved in the proposed temperature sensing system with fiber cavity length of 6.05 m. We also study the relationship between temperature and central wavelength of fiber Bragg grating by chaotic correlation fiber loop ring down system and receive the temperature sensitivity of 0.01 nm/degrees C of the FBG. This sensing method is not only simple and low cost, but also has the great potential applications for various industry and agriculture.