材料科学
聚二甲基硅氧烷
水听器
聚偏氟乙烯
声学
压电
水下
铝
基质(水族馆)
复合材料
灵敏度(控制系统)
电子工程
聚合物
工程类
海洋学
物理
地质学
作者
B.L. Xiao,Yubo Su,Hongmeng Gui,Xiongchao Ma,Zhenjun Liu,Rongrong Zhao
标识
DOI:10.1016/j.sna.2023.114822
摘要
Unmanned underwater vehicles (UUVs) need hydrophones for underwater acoustic sensing. However, previous hydrophones were rigid in shape and unable to realize conformal installation. In this paper, a flexible hydrophone with great installation adaptability was presented. Polyvinylidene fluoride (PVDF) piezoelectric film was applied as the transducing material. A flexible aluminum film was selected as the substrate. These two films were sandwiched by polydimethylsiloxane (PDMS) layers. Finite element simulation revealed that the sensitivity and bandwidth of the hydrophone were enhanced by using the aluminum film substrate. The sensing performance improvement was ascribed to the suppressed in-plane stress of the PVDF film. Prototypes were fabricated and tested. The fabricated hydrophone exhibited a sensitivity of −211 dB (ref. 1 V/μPa) at 500 Hz. It owned a 20–500 Hz working frequency range and an omnidirectional pattern. Besides, the sensitivity difference caused by shape changes was within 2.3 dB. Furthermore, the hydrophone showed good waterproofing ability.
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