基于高斯白噪声调制的布里渊光相干反射温度传感器

根据光纤布里渊频移量随温度变化的特性,提出一种基于布里渊光相干反射技术的分布式光纤温度传感器.利用噪声信号的无周期特性,采用高斯白噪声信号对系统的光源进行电流调制,克服了现有布里渊光相干反射技术无法同时兼顾传感距离和空间分辨率的问题.实验研究表明,该传感器在253m的普通单模光纤上实现了分布式温度测量,获得了54.6cm的空间分辨率和±1.07℃的温度测量准确度.

Abstract

A scheme to measure the temperature distribution based on Brillouin optical correlation reflectometry was proposed according to the dependence of the Brillouin frequency shift on the temperature in the optical fiber. The white Gausssian noise signal was utilized to modulate the laser because of the non-periodicity of the noise,which could resolve the problem of the trade-off between the measurement range and the spatial resolution existed in conventional Brillouin optical correlation reflectometry systems. The experiment of temperature measurement was demonstrated in 253 m standard single-mode optical fiber,with spatial resolution of 54.6 cm and temperature accuracy of ±1.07℃.

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柴晶, 张明江, 刘毅, 张永宁, 刘慧, 李云亭. 基于高斯白噪声调制的布里渊光相干反射温度传感器[J]. 光子学报, 2015, 44(10): 1006004. CHAI Jing, ZHANG Ming-jiang, LIU Yi, ZHANG Yong-ning, LIU Hui, LI Yun-ting. Distributed Temperature Sensor with Brillouin Optical Correlation Reflectometry Based on White Gaussian Noise Modulation[J]. ACTA PHOTONICA SINICA, 2015, 44(10): 1006004.

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