光学技术, 2015, 41 (3): 193, 网络出版: 2015-05-20
基于双M-Z干涉仪的光纤周界防护系统
Fiber-optic perimeter security system based on dual Mach-Zehnder interferometer structure
Mach-Zehnder干涉仪 周界防护 光纤传感器 Mach-Zehnder interferometer(MZI) perimeter protection optical fiber sensor
摘要
基于光纤双Mach-Zehnder干涉仪(MZI)结构对周界防护系统进行了设计研究。通过对两路经过不同延时的相同信号进行互相关运算, 实现了对振动入侵点的定位。提出了一种分段数据处理方法, 有效地提高了定位稳定性及准确性。测试结果表明, 该双Mach-Zehnder干涉仪周界防护系统可以实时对振动点进行定位, 在传感光纤长度为2km、采样率为2MHz时定位精度优于200m, 能够长时间连续稳定工作。
Abstract
A perimeter security system based on dual Mach-Zehnder interferometer is designed and researched. A cross-correlation algorithm is adopted to calculate the time difference of signals on two channels for locating invasion points. By means of processing data in segment, the stability and accuracy of system is improved effectively. An experiment with 2-kilometer-long sensing fiber is carried out, which shows that the dual Mach-Zehnder perimeter protection system can identify the position of vibration instantaneously and has a location accuracy of 200 meters at a sampling frequency of 2M, ensures stable long-time work as well.
姜霁珊, 江毅, 刘达, 王素梅, 李晓炜. 基于双M-Z干涉仪的光纤周界防护系统[J]. 光学技术, 2015, 41(3): 193. JIANG Jishan, JIANG Yi, LIU Da, WANG Sumei, LI Xiaowei. Fiber-optic perimeter security system based on dual Mach-Zehnder interferometer structure[J]. Optical Technique, 2015, 41(3): 193.