An Optical Acoustic Detection System Based on Fabry Pérot Etalon Stability Structure.
An Optical Acoustic Detection System Based on Fabry Pérot Etalon Stability Structure.
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基于Fabry Pérot Etalon稳定结构的光声检测系统
DOI：
10.3390/mi12121564
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发表时间：
2021-12-16
期刊：
影响因子：
3.4
通讯作者：
Chen J
中科院分区：
文献类型：
--
作者：
Wu L;Zheng Y;Xue C;Bai J;Chen J
介绍了基于高品质因数（High Q）和稳定结构的法布里珀罗标准具（FPE）的光声探测系统，并进行了实验。FPE包含两个高反射率平凹透镜，实现高精细度和稳定性。共焦稳定FPE的保护结构由殷钢管、铜护套、胶木护套和铝外壳组成，以保护传感器免受环境温度和振动的影响。音频信号通过位于腔体中心的音孔注入腔体。声波引起腔内介质的振动，导致FPE光路的同时改变和干涉光谱的移动。搭建了声探测系统，利用相位调制技术将激光器的频率锁定在FPE的谐振频率点上，从而实现对不同频率和幅度的声信号的探测。在20 Hz ~ 20 kHz范围内，传感器的灵敏度超过34.49 mV/Pa。在20 Hz时可实现37 dB的信噪比（SNR）。利用基于FPE稳定性模型的声信号检测技术，对未来高灵敏度法布里-珀罗干涉（FPI）声传感器的理论可行性进行了验证。
The optical acoustic detection system based on the Fabry Pérot Etalon (FPE) with high quality–factor (High Q) and stability structure is described and tested. The FPE contains two high–reflectivity Plano–Concave lenses, achieving high fineness and stability. The protective structure of the confocal stabilized FPE is composed of an invar tube, copper sheath, Bakelite sheath and aluminum housing to protect the sensor from the effects of ambient temperature and vibration. The audio signal is injected into the cavity through the sound hole located in the center of the cavity. Acoustic waves induce the vibration of the medium in the cavity, which leads to a simultaneous change in the FPE optical path and a shift of the interference spectrum. The acoustic detection system is built, and the frequency of the laser is locked on the resonant frequency points of the FPE by using phase modulation technology, so as to detect acoustic signals of different frequencies and amplitudes. In addition, the sensitivity of the proposed sensor exceeds 34.49 mV/Pa in the range of 20 Hz–20 kHz. A Signal-to-Noise Ratio (SNR) of 37 dB can be achieved at 20 Hz. Acoustic signal detection technology based on the FPE stability model is used to test the theoretical feasibility of the future high sensitivity Fabry Pérot Interferometric (FPI) acoustic sensors.
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