水听器
材料科学
绝缘体上的硅
灵敏度(控制系统)
压电
声学
噪音(视频)
带宽(计算)
光电子学
电子工程
硅
电信
物理
工程类
计算机科学
复合材料
人工智能
图像(数学)
作者
Jinghui Xu,Xiaolin Zhang,Sanchitha N. Fernando,Kevin Tshun-Chuan Chai,Yuandong Gu
摘要
This paper reports a piezoelectric aluminum nitride (AlN) based micro-machined infrasonic hydrophone. We have conducted a systematic design study for the hydrophone sensor to meet the stringent requirements of underwater applications. The hydrophone sensor was fabricated on a cavity silicon-on-insulator (SOI) substrate using an in-house CMOS-compatible AlN-on-SOI process platform. A 5 × 5 arrayed hydrophone sensor was characterized thoroughly using an industry-standard hydrophone calibration instrument. The results show that the hydrophone achieved a sound sensitivity of −182.5 dB ± 0.3 dB (ref. to 1 V rms/μPa) and an eligible acceleration sensitivity of only −196.5 dB (ref. to 1 V rms/μg), respectively, a non-linearity of 0.11%, a noise resolution of 57.5 dB referenced to 1 μPa/√Hz within an ultra-low operation bandwidth of 10 Hz∼100 Hz, the highest noise resolution of micro-machined hydrophones reported to date, and better than traditional bulky hydrophones in terms of the same application. The size of the 5 × 5 arrayed hydrophone sensor is about 2 mm × 2 mm.
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