本文提出一种基于氧化石墨烯（Graphene Oxide，GO）微腔的光纤多频法布里-珀罗（Fabry-Perot，FP）声振动传感器。该传感器使用单模光纤端面和GO薄膜构成微米级尺度的FP干涉微腔结构，采用液相法制备GO薄膜并将其作为声振动信号的敏感材料，实现对外界声振动信号的探测。通过控制和优化FP微腔长度可以获得消光比最大的干涉光谱，并对该传感器施加不同频率的单频、双频和三频声振动信号以测试其对多频信号的响应能力。实验结果表明，该传感器具有较高的信噪比（Signal to Noise Ratio，SNR）；对单频振动信号传感的SNR最高可达61.8 dB，频率响应范围较宽，约为500 Hz~20 kHz；对双频和三频声振动信号传感的SNR最高分别可达56.8 dB和54.4 dB。

In this paper, we propose a fiber-optic multifrequency Fabry-Perot (FP) acoustic vibration sensor based on a graphene oxide (GO) microcavity. The sensor uses a single-mode fiber end face and GO film to form a micron-scale FP interference microcavity structure. The GO film is prepared by liquid-phase method and used as a sensitive material to detect the external acoustic vibration signals. Through controlling and optimizing the length of the FP microcavity, the interference spectrum with the largest extinction ratio can be obtained, and single-, dual-, and triple-frequency acoustic vibration signals of different frequencies are applied to the sensor to test its response capability to multifrequency signals. The experimental results show that the sensor has a high signal-to-noise ratio (SNR); the SNR for single-frequency vibration signal sensing can reach up to 61.8 dB, and the frequency response range is wide, approximately 500 Hz?20 kHz; the highest SNR for dual- and triple-frequency acoustic vibration signal sensing can reach 56.8 dB and 54.4 dB, respectively.