YIP Tailoring Piezoelectricity and Capacitance of Textured Ceramics for Advanced Hydrophone Sensors
Abstract
Current hydrophone devices use conventional materials such as PZT-4 ceramics, but are limited by high piezoelectric response in the lateral, transverse mode. This is evidenced by the low materials figure of merit (FOM) which takes into account the difference in the longitudinal (d33) and transverse (d31) response. New materials, such as textured lead titanate ceramics, have superior hydrophone FOM to conventional materials like PZT, however, the significantly lower dielectric permittivity of lead titanate makes the response of the hydrophone sensor susceptible to interference from stray capacitance of device cabling. New materials are needed that have both a higher FOM as well as greater capacitance (#_33^T#500) to increase sensitivity without matching the capacitance of the sensor fixture or wiring. The current work aims to overcome this challenge through a three phase development effort to (1) synthesize a novel modified textured ceramic composition, (2) characterize IEEE standard properties and perform computer simulation of hydrophone transducer behavior, and (3) construct and test a hydrophone sensor using advanced textured ceramic composition. The ceramic composition of choice is a chemistry with a highly anisotropic structure, such as tetragonal lead titanate, which can be modified to tailorthe d33/d31 mode ratio, and crystallographically oriented to maximize the longitudinal (d33) response of the material. Through this work, key material relationships that contribute to lateral vibrational modes and hydrophone sensitivity are established, and properties are tailored to produce the next generation of advanced acoustic hydrophone sensor materials.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 11, 2024
- Source ID
- N000142412199
Entities
People
- Beecher H. Watson
Organizations
- Office of Naval Research
- Pennsylvania State University
- United States Navy