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A New Self-Powered Sensor Using the Radial Field Piezoelectric Diaphragm in d 33 Mode for Detecting Underwater Disturbances

Research output: Contribution to journalArticle

Original languageEnglish
Number of pages14
JournalSensors (Basel, Switzerland)
Volume19
Issue number4
DOIs
DateSubmitted - 17 Jan 2019
DateAccepted/In press - 21 Feb 2019
DatePublished (current) - 24 Feb 2019

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 d33 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.

    Research areas

  • finite element analysis, micro-fabrication, piezoelectric sensors, radial field diaphragm, underwater sensing

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via MDPI at https://doi.org/10.3390/s19040962 . Please refer to any applicable terms of use of the publisher.

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    Licence: CC BY

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