论文部分内容阅读
为了对长距离周界入侵进行定位,提出一种使用3×3耦合器作为基本元件的Fox-Smith干涉仪光纤入侵探测系统。对此结构及其定位方法进行了理论分析和实验验证。当有冲击作用在传感光纤上时,光纤中的光波受到相位调制,利用两束光波受到调制的时间不同从而产生相位差;通过对解调出的相位信号进行傅里叶变换,获取了一系列的陷波点。结果表明,在长度为34.793km传感光纤上,获得平均定位误差为±83m,可见该种结构在长距离周界系统定位是可行的。这一结果在长距离周界入侵定位上具有一定的帮助。
To locate long-range perimeter intrusion, a Fox-Smith interferometer fiber intrusion detection system using a 3 × 3 coupler as an essential element is proposed. This structure and its positioning method are theoretically analyzed and experimentally verified. When there is an impact on the sensing fiber, the light wave in the fiber is phase-modulated, and the phase difference is generated by using the time modulated by the two light waves. By performing Fourier transform on the demodulated phase signal, a Series of trap points. The results show that the average positioning error of the fiber with the length of 34.793km is ± 83m, indicating that this kind of structure is feasible in the long-distance perimeter system. This result has some help in long-distance perimeter invasion.