研究了一种基于多层石墨烯材料的光纤声波传感器, 该传感器是由单模光纤和多层石墨烯薄膜构成的光纤法布里-珀罗干涉腔结构。分别采用多层的石墨烯和氧化石墨烯(GO)材料作为声压敏感薄膜, 进行声波传感实验研究。结果表明, 在音频范围内, 基于石墨烯和GO薄膜的光纤声波传感器的平均信噪比分别达到56 dB和69 dB, 平均最小可探测声压灵敏度分别为20.8 μPa·Hz-1/2和6.63 μPa·Hz-1/2, 远低于电学声波传感器的最小可探测声压灵敏度。基于石墨烯材料的光纤声波传感器具有更高的声波检测灵敏度, 适用于强电磁干扰、狭小空间等环境下的微声压测量。

A kind of fiber-optic acoustic sensor based on the multi-layered graphene material is studied, which has a Fabry-Perot interferometic cavity structure, consisting of single mode fibers and multi-layered graphene films. With the multi-layered pure graphene and multi-layered graphene oxide (GO) as the acoustic pressure sensitive film respectively, the experiments of acoustic wave sensing are conducted. The results indicate that, in the audio range, the average signal-to-noise ratios of the fiber-optic acoustic sensors based on multi-layered pure graphene and multi-layered GO films reach 56 dB and 69 dB, respectively. The sensitivities of the average minimum detectable acoustic pressure are 20.8 μPa·Hz-1/2 and 6.63 μPa·Hz-1/2, respectively, far smaller than that of the electric acoustic sensor. The fiber-optic acoustic sensors based on the graphene material possess a high sensitivity, which is suitable for the micro-acoustic pressure measurement under the environment of severe electromagnetic interference and confined spaces.