马赫-泽德干涉仪结构的光纤传感器应用于周界报警器系统，能够对发生在传感器区域内的振动信号进行报警，并具有极高的灵敏度。为了减少周界报警系统的误报警率，针对周界报警系统输出信号的处理问题，采用小波变换的方法对周界报警系统输出的电压信号进行辨识，不但能滤除信号中的噪声，而且能很好的保留信号的突变部分，可以很好的区分蓄意入侵与风雨产生的振动，从而减少系统误报警率并能实现对蓄意入侵定位，这对于周界报警器系统真正实现工程应用具有突破性进展。大量实验结果表明，采用小波变换方法辨识周界报警系统输出信号，能很好的体现测量信号中的奇异值并显著减少周界报警系统的误报警率。

The fiber-optic sensor based on Mach-Zehnder interferometer is used in the perimeter alarm system. It can be used for alarming the vibration signal which occurs in the sensing area and has a very high sensitivity. In order to reduce the false alarm rate of perimeter alarm system，for signal processing of perimeter alarm system，by applying the wavelet transform method, the voltage signal outputted by the perimeter alarm system is identified, which could not only filter the noise signal but also retain mutant signal and distinguish very well the vibrations produced by deliberate invasion and rain to reduce false alarm rates of the perimeter alarm system and realize the deliberate invasion positioning. It is a breakthrough for the perimeter alarm system to realize engineering application. A large number of experimental results showed that it could reflect the singular value of measurement signals and remarkably reduce the false alarm rate of perimeter alarm system based on wavelet transform method to analyze signal of perimeter alarm system.