分布式干涉型光纤振动传感器实验研究

为实现无电磁干扰的小区周界安全检测，开发出了一种新型的分布式干涉型光纤振动传感器，基于MZ光纤干涉型传感光路，采用干涉法检测光缆振动，构成小区光纤周界检测传感器，当传感光纤受到外界入侵扰动时，接收到的干涉条纹会产生明显的变化，从而给出周界安全预警。并分别以频率14.6678Hz和20.2012Hz的三角波作为调制信号进行了实验研究，结果显示，干涉型扰动探测系统非常灵敏，只要光缆有轻微的触动，波形就会有明显的改变，很容易区分有无外界的扰动发生，对安全防范意义重大。

Experimental Study on Distributed interferometric Fiber-Optic Vibration Sensor

In order to implement the community perimeter security detection without electromagnetic interference, developed a new type of distributed interferometric fiber optic vibration sensor, the photosensitive fiber based on MZ interference type of the road, by using interference detection cable vibration, a plot fiber perimeter detection sensors, when there is external invasion disturbances of sensing optical fiber, receives the interference fringe can produce significant change, thus the perimeter security early warning is given. Respectively by the frequency of 14.6678 Hz and 20.2012 Hz triangle wave as modulation signal has carried on the experimental study, results show that the interferometric disturbance detection system is very sensitive, as long as there is a slight cable touches, waveform will have obvious change, it is easy to distinguish between presence of external disturbances, is of great significance to safety.