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。
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 experi- ment 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 fre-quency of 2M, ensures stable long-time work as well.
出处
《光学技术》
CAS
CSCD
北大核心
2015年第3期193-196,共4页
Optical Technique
基金
国家自然科学基金青年基金项目(51105038)
