一种新的自供电传感器，使用 d 模式下的径向电场压电膜片检测水下干扰。

A New Self-Powered Sensor Using the Radial Field Piezoelectric Diaphragm in d Mode for Detecting Underwater Disturbances.

机构信息

State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China.

School of Mechanical and Aerospace Engineering, Nanyang Technological University, 639798, Singapore.

出版信息

Sensors (Basel). 2019 Feb 24;19(4):962. doi: 10.3390/s19040962.

DOI:10.3390/s19040962

PMID:30813503

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6412899/

Abstract

This paper presents a new sensor based on a radial field bulk piezoelectric diaphragm to provide energy-efficient and high-performance situational sensing for autonomous underwater vehicles (AUVs). This sensor is self-powered, does not need an external power supply, and works efficiently in d mode by using inter-circulating electrodes to release the radial in-plane poling. Finite element analysis was conducted to estimate the sensor behavior. Sensor prototypes were fabricated by microfabrication technology. The dynamic behaviors of the piezoelectric diaphragm were examined by the impedance spectrum. By imitating the underwater disturbance and generating the oscillatory flow velocities with a vibrating sphere, the performance of the sensor in detecting the oscillatory flow was tested. Experimental results show that the sensitivity of the sensor is up to 1.16 mV/(mm/s), and the detectable oscillatory flow velocity is as low as 4 mm/s. Further, this sensor can work well under a disturbance with low frequency. The present work provides a good application prospect for the underwater sensing of AUVs.

摘要

本文提出了一种基于径向场体压电膜片的新型传感器，为自主水下机器人（AUV）提供节能高效的现场感测。该传感器自供电，无需外部电源，通过使用循环电极释放径向面内极化，在 d 模式下高效工作。通过有限元分析来估计传感器的行为。通过微制造技术制造了传感器原型。通过阻抗谱检查了压电膜片的动态行为。通过使用振动球体模拟水下干扰并产生振荡流速，测试了传感器检测振荡流的性能。实验结果表明，传感器的灵敏度高达 1.16 mV/（mm/s），可检测到的振荡流速低至 4 mm/s。此外，该传感器在低频干扰下也能很好地工作。本工作为 AUV 的水下感测提供了良好的应用前景。