High Sensitivity Vibration Sensor Based on Polarization Maintaining Micro Fiber

Abstract

A high sensitivity vibration sensor based on polarization-maintaining microfiber Mach-Zehnder interferometer(MMZI) is studied. By using the fused taper technology, the polarization-maintaining fiber is tapered into a polarization-maintaining-non-polarization-maintaining structure to form a MMZI with multi-channel comb filtering characteristics. The MMZI and fiber Bragg grating are used to form a sensing structure to measure the vibration signal.The experimental results show that the sensitivity of the sensor can reach 35.47 mV/Pa in the low frequency range, and the minimum detection pressure is 171.7 mPa·Hz~(-1/2). The sensor has good vibration detection ability and stability,which lays a good theoretical and experimental foundation for the detection of vibration signals and the preparation of high sensitivity vibration sensors.

Keywords

• microfiber-assisted mach-zehnderinterferometer
• polarizationmaintaining fiber
• sensitivity
• vibration sensor