Characterization of acoustic diffusion using refracto-vibrometry

Jackett, R, Piper, B and Hughes, RJ ORCID: https://orcid.org/0000-0002-8916-1227 2017, 'Characterization of acoustic diffusion using refracto-vibrometry' , Journal of Sound and Vibration, 392 , pp. 70-76.

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Abstract

Refracto-vibrometry is a relatively new measurement technique that is sensitive to variations in the optical refractive index of a medium caused by changes in acoustic pressure within that medium (the acousto-optic effect). It has so far been employed primarily as a qualitative visualization tool for airborne sound propagation because determining sound pressure level at a point using the technique is difficult and inefficient. Instead, the authors propose that this optical technique is well suited for determining dimensionless quantities, such as coefficients describing scattering uniformity from a surface. A new measurement and analysis process relying on refracto-vibrometry has been developed and used to determine acoustic diffusion coefficients through purely optical means for the first time. A quadratic residue diffuser is used as an arbitrary test surface, and refracto-vibrometry measurements of its polar response have been performed and results compared to a boundary element model. The benefits and limitations of the optical method over the traditional microphone-based approach are discussed.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Journal of Sound and Vibration
Publisher: Elsevier
ISSN: 0022-460X
Related URLs:
Depositing User: RJ Hughes
Date Deposited: 11 Dec 2019 12:21
Last Modified: 03 Jan 2020 15:33
URI: http://usir.salford.ac.uk/id/eprint/53440

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