CAJ | 학술논문

布里渊光时域反射计检测信号较微弱的自发布里渊散射光,其布里渊频移只有11 GHz左右.相干检测是一较好的方法,但其接收信号是一宽带的幅度调制信号,难以直接解调.采用实时小波变换对传感信号进行处理,设计了布里渊光时域反射计传感器实验系统,实现了25 km的分布式温度传感,在5 m的空间分辨率和1 min的响应时间下,达到40 με的应变分辨率.
포리연광시역반사계검측신호교미약적자발포리연산사광,기포리연빈이지유11 GHz좌우.상간검측시일교호적방법,단기접수신호시일관대적폭도조제신호,난이직접해조.채용실시소파변환대전감신호진행처리,설계료포리연광시역반사계전감기실험계통,실현료25 km적분포식온도전감,재5 m적공간분변솔화1 min적향응시간하,체도40 με적응변분변솔.
In Brillouin optical time domain reflectometer, the detected spontaneous Brillouin scattering light is very weak, and the Brillouin frequency shift is only about 11 GHz. The coherent detect is a good method, but the detected signal is a wideband amplitude-modulated signal, which is hard to demodulate. The real-time Morlet wavelet transform is adopted to overcome this problem. The experimental procedures and results are presented in the text. A laboratorial system of 25 km distributed Brillouin optical time domain refractor is achieved, with the stress resolution of 40 με, the spatial resolution of 5m and the system response time of 1 minute.