光学学报, 2016, 36 (4): 0406001, 网络出版: 2016-04-05
空间电扫描型低相干干涉长距离光纤传感解调系统
Spatial Electronic Scanned Low-Coherence Interference Long Distance Optical Fiber Sensing and Demodulation System
测量 低相干干涉解调仪 双超辐射发光二极管光源 长距离传感 双阈值算法 measurement low-coherence interferometry double superluminescent light emitting diode sourc long distance sensing double-threshold algorithm
摘要
基于双超辐射发光二极管(SLED)光源研究了空间电扫描型低相干干涉长距离光纤传感解调系统。通过负透镜扩束搭建了紧凑解调干涉光路，分析了双SLED 光源功率比对低相干干涉条纹形态的影响并探讨了传输损耗的功率比补偿。针对双SLED 光源干涉条纹的特点，提出了双阈值的任意极值解调算法，并进行了压力解调实验。结果表明，在50~180 kPa 的压力范围内，利用不同峰值，可以实现0.24%~0.40% F.S.(F.S.为全量程)的解调精度，光纤传输距离达到1.76 km，与理论分析吻合。
Abstract
Spatial electronic scanned low- coherence interference long distance optical fiber sensing and demodulation system is investigated based the superluminescent light emitting diode (SLED). The compact beam path of demodulation interferometry is built by negative lens. The influence of the double SLED light sources power ratio on low-coherence interference fringe is analyzed and the power ratio compensation for transmission loss is discussed. According to the characteristics of double SLED light sources interference fringe, a double-threshold demodulation algorithm is proposed and a pressure demodulation experiment is conducted. Experimental results show that, in the pressure range from 50 kPa to 180 kPa, the demodulation precision of 0.24% to 0.40% F.S. is realized, where F.S. is full scale, and that the longest distance can reach 1.76 km. The results are in good agreement with the theoretical analysis.
石俊锋, 刘铁根, 王双, 江俊峰, 刘琨, 邹盛亮, 肖梦楠. 空间电扫描型低相干干涉长距离光纤传感解调系统[J]. 光学学报, 2016, 36(4): 0406001. Shi Junfeng, Liu Tiegen, Wang Shuang, Jiang Junfeng, Liu Kun, Zou Shengliang, Xiao Mengnan. Spatial Electronic Scanned Low-Coherence Interference Long Distance Optical Fiber Sensing and Demodulation System[J]. Acta Optica Sinica, 2016, 36(4): 0406001.
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