An integrated vibration measurement scheme with wide dynamic range, high frequency response and multi-points accurate location is proposed by combining unidirectional Mach-Zehnder interferometer (MZI) and phase sensitive optical time domain reflectometer (φ-OTDR). Using a wavelength division multiplexing (WDM) scheme, the φ-OTDR and the MZI are merged together into one novel system successfully. An improved 3 × 3 coupler-based demodulation method is proposed to demodulate the interference signal produced by the MZI. The vibration frequency is obtained by analyzing the demodulated phase difference. Meanwhile, the vibration position is obtained by analyzing the backscattering signals produced by the φ-OTDR. Experimental results demonstrate that the spatial resolution is 20 m at the sensing length of 4 km and the frequency response reaches up to 10 MHz. Compared with the previous merged systems, this system detects the frequency without dead zone. The MZI part does not affect the φ-OTDR part. The vibration frequency can be obtained accurately with no limitations of π radians phase difference jumps, which means the detectable dynamic range is expanded.

通过结合单向马赫曾德尔干涉仪（MZI）和相敏光时域反射仪（φ-OTDR），提出了一种具有宽动态范围，高频响应和多点精确定位的集成振动测量方案。使用波分复用（WDM）方案，将φ-OTDR和MZI成功合并到一个新颖的系统中。提出了一种改进的基于3×3耦合器的解调方法，以解调MZI产生的干扰信号。通过分析解调的相位差来获得振动频率。同时，通过分析由φ-OTDR产生的反向散射信号来获得振动位置。实验结果表明，在4 km的感测长度下，空间分辨率为20 m，频率响应高达10 MHz。与以前的合并系统相比，该系统可以检测到没有死区的频率。MZI部分不影响φ-OTDR部分。可以精确地获得振动频率，而不受π弧度相位差跳跃的限制，这意味着可检测的动态范围得到了扩展。