Michelson干涉仪式光纤空气声传感器  

Fiber Optic Sound Sensor Based on Michelson Interferometer

作　　者：王永杰[1] 李芳[1] 肖浩[1] 刘育梁[1] 

机构地区：[1]中国科学院半导体研究所光电系统实验室,北京100083

出　　处：《光子学报》2009年第5期1114-1117,共4页Acta Photonica Sinica

基　　金：中国科学院创新基金(CXJJ-177)资助

摘　　要：介绍了一种用于直升机等低空目标探测的光纤空气声传感器.该传感器基于光纤Michelson干涉仪的原理,结合弹性盘片的应力应变理论分析和光纤粘接的工艺设计,采用相位载波解调技术进行信号解调.对比实验测试验证了这种声音探测技术可行性.传感器理论灵敏度为2.38rad/Pa,实测灵敏度为1.5rad/Pa,采用PGC相位解调理论最小可探测的最小声信号为6.7μPa,即9.5dB.传感器在20～300Hz范围内响应基本平坦.结合声音传播规律分析并肯定其在实用中的可行性.A novel Fiber Optic Sound Sensor （FOSS） for detecting military targets was presented. The principle of the FOSS was based on Michelson interferer technology and the transducer was made of a plate disk and a fiber. The model was established by lheoretically analyzing the strain distribution throughout the pate disk. The FOSS was tested experimentally. The results show that the theoretical sensitivity is 2.38 tad · Pa a and practical sensitivity is 1.5 rad · Pa ^-1. The minimum sound signal is 6.7 μPa（9.5 dB re 20 txPa） with Phase generated Carrier （PGC） Method. The frequency response is flat from 20 Hz to 300 Hz. The experiment of the FOSS is feasible according to the sound propagation principle.

关 键 词：光纤传感器 光纤空气声传感器 麦克尔逊干涉仪 弹性盘片 

分 类 号：TN253[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]