Hearing the Sounds of Aquatic Life Using Optical Fiber Microtip-Based Hydrophone
Hearing the Sounds of Aquatic Life Using Optical Fiber Microtip-Based Hydrophone
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DOI：
10.1109/tim.2019.2943732
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发表时间：
2020-07
影响因子：
5.6
通讯作者：
Sumit Dass;Santosh Kachhap;R. Jha
中科院分区：
文献类型：
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作者：
Sumit Dass;Santosh Kachhap;R. Jha
对于海洋生物声学应用，必须以高精度和最小噪声记录水生动物的声音，以便提取有价值的信息。对于这样的海洋应用，我们提出并证明了光纤微尖水听器。水听器的设计包括一个非本征法布里-珀罗干涉仪，它利用光纤微尖和加工铝箔作为两个部分反射镜。封装的光纤水听器尺寸为1.4 cm $\times1.4 $ cm $\times 2$ cm，微尖直径为31.23 $\mu {m}$，天然橡胶膜片直径为6 mm，在1 kHz时显示出8.94 nm/mPa或−41.42-dB re 1 nm/ $\mu $ Pa的高灵敏度。该水听器具有很好的信噪比，在1 kHz时，最小可探测声压的噪声极限为0.388 μ Pa/Hz。水听器的线性工作范围为0-3950 Hz。实验结果表明，所提出的光纤水听器可以非常准确地检测到海豚的回声定位所产生的点击列车。此外，根据应用，所提出的水听器的性能参数可以通过改变膜片的厚度和直径来定制，从而打开了一个新的平台，研究海洋环境。
For marine bioacoustics applications, the sounds by aquatic animals must be recorded with a high precision and minimal noise in order to extract valuable information. For such marine applications, we propose and demonstrate an optical fiber microtip-based hydrophone. The hydrophone design consists of an extrinsic Fabry–Perot interferometer, which utilizes fiber microtip and processed aluminum foil as two partially reflecting mirrors. The packaged optical fiber hydrophone of dimensions 1.4 cm $\times1.4$ cm $\times 2$ cm, with a microtip diameter of 31.23 $\mu \text{m}$ and natural rubber diaphragm of 6 mm diameter, shows a high sensitivity of 8.94 nm/mPa or −41.42-dB re 1 nm/ $\mu $ Pa at 1 kHz. The hydrophone shows an excellent signal-to-noise ratio, and the noise-limited minimum detectable pressure is as low as $0.388~\mu $ Pa/ $\surd $ Hz at 1 kHz. The linear working range of the hydrophone is 0–3950 Hz. The experimental results show that the proposed optical fiber hydrophone can very accurately detect the click trains produced by dolphins for echolocation. Furthermore, depending on the applications, the performance parameters of the proposed hydrophone can be tailored by changing the diaphragm thickness and diameter, thus opening a new platform to study the marine environment.