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

作　　者：石俊锋 刘铁根[1] 王双[1] 江俊峰[1] 刘琨[1] 邹盛亮[1] 肖梦楠 

机构地区：[1]天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室天津大学光纤传感研究所,天津300072

出　　处：《光学学报》2016年第4期57-64,共8页Acta Optica Sinica

基　　金：国家重大科学仪器设备开发专项(2013YQ030915);国家973计划(2010CB327802);国家自然科学基金(61227011;61378043;61475114;61505139);教育部科学技术研究重大项目(313038);天津市自然科学基金(13JCYBJC16200);深圳市科技创新委员会基金(JCYJ20120831153904083);中国空间技术研究院CAST创新基金;新型传感器与智能控制教育部与山西省重点实验室开放课题(201403)

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 k Pa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。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 k Pa to 180 k Pa, 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.

关 键 词：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 

分 类 号：TN29[电子电信—物理电子学]