在干涉型分布式光学振动传感系统中,双马赫-曾德尔技术具有较高的定位精度和较低的成本,更受关注。现搭建了双马赫-曾德尔分布式光纤传感系统,并对其进行了定位实验,阐述了检测系统的组成和原理。对基于互相关算法的定位性能进行研究,测试了其单点定位和多点定位功能,指出其定位局限性。另外重点分析了影响该系统定位稳定性的因素,提出一种数据处理算法,以提高其定位稳定性。实验结果表明,经过该算法数据处理之后,系统定位稳定性和可靠性得到极大提高。

Dual Mach-Zehnder technology has been paid much attention in interferometric distributed optical vibration sensors due to its superior positioning performance and lower cost. A dual Mach-Zehnder fiber-optic distributed sensing system was set up and experimented, and the composition and working principle of the detection system was also expatiated. The performance of positioning based on the cross-correlation algorithm was studied, its limitations of positioning was pointed out when testing the fuction of single-point positioning and multi-point positioning. In addition, the factors impacting the stability of the system position were analysed in detail, and a data-processing algorithm was proposed to improve its stability. Experimental results show that the stability and reliability of system position have been greatly improved after data-processing.