混合干涉型分布式光纤传感器PGC信号解调设计与实验分析  

Mixed interferometric distributed fiber optic sensor PGC demodulation module design and experimental data analysis

作　　者：朱俊[1] 王强[2] 谷小红[1] 杨其华[2] 

机构地区：[1]中国计量学院机电工程学院,浙江杭州310018 [2]中国计量学院质量与安全工程学院,浙江杭州310018

出　　处：《应用光学》2015年第4期660-666,共7页Journal of Applied Optics

基　　金：国家自然科学基金(51374188);浙江省自然科学基金项目(LR13E040001);质检公益性行业科研专项(201310152)

摘　　要：对一种基于马赫-曾德尔和萨格纳克混合干涉仪原理的分布式光纤泄漏检测系统调制解调技术进行研究,对PGC解调技术进行理论分析。针对所选泄漏分布式光纤传感特点设计了PGC解调硬件电路,并对PGC解调电路进行了测试。实验中待测信号为0~50kHz,载波频率为300kHz,截止频率为50kHz,移相后与待测信号的相关系数达到0.95,谐波失真小于3%,泄漏源位置为7.865km,泄漏检测定位系统绝对定位误差为235 m,相对定位误差为2.35%。本解调定位系统具有稳定性和抗干扰性。The demodulation technology based on the Mach-Zehnder and Sagna mixed interferometer distributed optical fiber leak detection system was studied.The theory of phase generated carrier(PGC)demodulation technology was researched and analyzed.According to the characteristics of the selected leak distributed optical fiber sensor,we designed and tested the hardware circuit of PGC demodulation.The experiment signals to be measured are 0~50kHz,the carrier frequency is 300 kHz and the cut-off frequency is 50 kHz.After phase shifting the correlation coefficient of signals to be measured is 0.95 and the harmonic distortion is less than3%,the absolute positioning error of demodulation positioning system at the leak location of7.865 km is 235 m,the relative positioning error is 2.35%.This demodulation positioning system has stability and anti-interference performance.

关 键 词：分布式光纤 混合干涉 PGC解调技术 载波频率 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]