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Engineering

Research project: Measurement of materials under ocean conditions

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Research Project

Project Overview

 

Introduction: A wide range of materials are used in sonar systems and are required to act as windows, absorbers or baffles. In order to develop and control the manufacture of these materials it is important to be able to measure their acoustic transmission and reflection properties over a wide range of operating temperatures and static pressures. This project is developing techniques to achieve this at low frequencies without the need to manufacture large samples.

 

Description: This collaborative project (with NPL, Dstl and QinetiQ) is developing improved techniques for measuring the acoustic properties of materials under ocean conditions (of temperature and pressures up to 7,000 kPa) in the National Physical Laboratory (NPL) Acoustic Pressure Vessel. The approach utilises a parametric array to generate a relatively confined beam over wide frequency band that is used to measure the acoustic transmission and reflection properties of materials in the form of panels. The current studies are concentrating on various techniques of reducing the lower frequency limit of the measurement technique.

 

 

Related research groups

Acoustics Group

Staff

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