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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。
The perimeter protection system is designed based on the fiber dual Mach-Zehnder interferometer (MZI) structure. Cross-correlation operation is carried out on the same signal with two different delays, which realizes the positioning of the point of vibration intrusion. Proposed a segmentation data processing method, effectively improve the positioning stability and accuracy. The test results show that the dual Peripheral Mach-Zehnder interferometer perimeter protection system can locate the vibration point in real time. When the sensing fiber length is 2km and the sampling rate is 2MHz, the positioning accuracy is better than 200m, which can work continuously and steadily for a long time.