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将微弱的背向散射波(backscattering echoes)从噪声中分离出来,成功地获得了背向散射信号。采用背向散射法代替以激光雷达原理为基础的光脉冲反射法,从而实现了任何恶劣断面的光纤断点都能被探测出来。系统全部采用国产器件实现。已对长1.1公里、总衰耗达14.2分贝、0.15NA 的光纤反复测试并核实,任何形式的末端面均能被探测出来,由此推算,对3分贝/公里的光导纤维,达到4.6公里内任意断点可测。探测的盲区为15米。运用背向散射法观察到了不良接头及某些较大缺陷的存在位置。实验中观察到了散射波返回的时延现象;对它引起的距离误差进行了分析。
By separating the weak backscattering echoes from the noise, backscatter signals are successfully obtained. The backscattering method replaces the optical pulse reflection method based on the principle of lidar, so that the breakpoint of any optical fiber with any bad section can be detected. All systems using domestic devices to achieve. Repeated tests and verifications of 1.1-km long, total attenuation of 14.2 dB and 0.15 NA of optical fiber have been made to detect any form of end-face, which is projected to reach 4.6 km for 3 dB / km of optical fiber Any breakpoint can be measured. Detection of the blind spot is 15 meters. The backscatter method was used to detect the presence of bad joints and some larger defects. The delay phenomenon of the scattered wave was observed in the experiment. The distance error caused by it was analyzed.