Abstract In order to eliminate strong ambient noise affecting the detection performance of optical fiber vibration sensing system, a composite system is proposed in this paper, which merges Michelson interferometer (MI) structure, Mach-Zehnder interferometer (MZI) structure and phase-sensitive optical time domain reflector (Φ-OTDR) structure by optical path coupling and wavelength division multiplexing. The MI structure is used to detect remote vibration signal, the MZI structure is used to detect the information of local ambient noise at the sensing fiber entrance, and the Φ-OTDR is used to locate vibration position. Experimental results show that the composite system can filter out frequency components of the ambient noise, restore and locate the vibration signal up to 20 kHz with single frequency noise of 1 kHz. Moreover, the vibration signal of 5 kHz could be located and restored at the length of about 4 km with the local ambient disturbance of percussion noise.

中文翻译：

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一种抗噪声复合光纤振动传感系统

摘要 为了消除影响光纤振动传感系统检测性能的强环境噪声，本文提出了一种融合迈克尔逊干涉仪（MI）结构、Mach-Zehnder干涉仪（MZI）结构和相敏光学结构的复合系统。时域反射器（Φ-OTDR）结构通过光路耦合和波分复用。MI结构用于检测远程振动信号，MZI结构用于检测传感光纤入口处的局部环境噪声信息，Φ-OTDR用于定位振动位置。实验结果表明，该复合系统能够滤除环境噪声中的频率成分，恢复和定位高达20 kHz的振动信号，单频噪声为1 kHz。而且，