Acoustic Performance Study of Fiber-Optic Acoustic Sensors Based on Fabry-Pérot Etalons with Different Q Factors.
Acoustic Performance Study of Fiber-Optic Acoustic Sensors Based on Fabry-Pérot Etalons with Different Q Factors.
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DOI：
10.3390/mi13010118
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发表时间：
2022-01-12
期刊：
影响因子：
3.4
通讯作者：
Han Y
中科院分区：
文献类型：
--
作者：
Chen J;Xue C;Zheng Y;Bai J;Zhao X;Wu L;Han Y
宽带、高灵敏度、大动态范围是光纤声传感器的理想发展方向。为了进一步提升基于法布里-珀罗标准具（FPE）的FOAS的声学探测潜力，以FPE的品质因子（Q）为研究目标，研究FOAS的声学性能具有重要意义。这是因为Q因子代表FPE的存储能力和损耗特性。具有不同Q因子的三种FOAS都实现了20 Hz至70 kHz的宽带响应，平坦度为2 dB，这与FOAS的频率响应不受Q因子影响的理论一致。此外，FOAS的灵敏度与Q因子成正比。当Q值为时，FOAS的灵敏度高达526.8mV/Pa。同时，实现了最小可检测声压。当Q值为时，最大可探测声压和动态范围分别为152.32 dB和107.2 dB，与其他两种FOAS相比有了很大的提高。不同Q值的FOAS在弱声和高声压声检测中表现出良好的声学性能。因此，通过选择合适的Q值，可以满足不同的声学探测要求，进一步拓宽了FOAS的应用范围和探测潜力。
The ideal development direction of the fiber-optic acoustic sensor (FOAS) is toward broadband, a high sensitivity and a large dynamic range. In order to further promote the acoustic detection potential of the Fabry–Pérot etalon (FPE)-based FOAS, it is of great significance to study the acoustic performance of the FOAS with the quality (Q) factor of FPE as the research objective. This is because the Q factor represents the storage capability and loss characteristic of the FPE. The three FOASs with different Q factors all achieve a broadband response from 20 Hz to 70 kHz with a flatness of 2 dB, which is consistent with the theory that the frequency response of the FOAS is not affected by the Q factor. Moreover, the sensitivity of the FOAS is proportional to the Q factor. When the Q factor is , the sensitivity of the FOAS is as high as 526.8 mV/Pa. Meanwhile, the minimum detectable sound pressure of is achieved. Furthermore, with a Q factor of , the maximum detectable sound pressure and dynamic range are 152.32 dB and 107.2 dB, respectively, which is greatly improved compared with two other FOASs. Separately, the FOASs with different Q factors exhibit an excellent acoustic performance in weak sound detection and high sound pressure detection. Therefore, different acoustic detection requirements can be met by selecting the appropriate Q factor, which further broadens the application range and detection potential of FOASs.
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