【作者】 简燕红；

【导师】 侯思祖；

【作者基本信息】 华北电力大学（河北） ， 通信与信息系统， 2010， 硕士

【摘要】 分布式光纤温度传感技术是一种用于实时测量空间温度分布的高新技术,是目前传感领域研究的一个热点。本文综述了分布式光纤温度传感技术的研究现状,深入研究了拉曼散射的基本理论,设计了一套基于自发拉曼散射原理的温度传感系统,搭建了光路部分与光电转换部分的实验系统,研究了传感光纤和功率对信号的影响;给出了信号采集与处理系统的总体设计框图,编程实现了信号采集、去噪处理、温度解调和图形显示等功能,完成了整个系统的设计与实现。针对数字累加平均算法存在的问题,引入了小波分析的方法,仿真验证了不同小波去噪方法的去噪效果,采用了将现有的累加平均算法与小波变换模极大值相结合的方法对信号进行处理,缩短了系统的测量时间,改善了系统的性能指标。更多还原

【Abstract】 Distributed optical fiber temperature sensing technology is a high-tech for the real-time measurement of temperature, which is hot in sensor field. The research condition of distributed optical fiber sensing technology is introduced in this paper. Deep research is taken on the principle of Raman scattering and a temperature sensing system based on the spontaneous Raman scattering is designed. The experiment system of optical part and the photoelectric conversion part is built to study the effects of sensing fiber and power on the signal. The diagram of signal acquisition and processing system is given, and the functions of acquisition, de-noising, temperature demodulation and graphics are realized. The system has been designed and achieved. Finally, according to the problems of cumulative average algorithm, the wavelet is introduced, and the effects of different wavelet de-noising methods are verified by simulating, a method combined with cumulative average algorithm and wavelet modulus maximum is proposed, shortening the system’s measurement time and improving the system performance.更多还原