Jackett, R; Piper, B; Hughes, R J* (2017) Characterization of acoustic diffusion using refracto-vibrometry. J. Sound Vib., 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 the coefficients describing reflection from a surface. A new measurement and analysis process relying on refracto-vibrometry has been developed and used to calculate 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
Subjects:	Acoustics Acoustics > Sound in Air
Divisions:	Chemical, Medical & Environmental Science
Identification number/DOI:	10.1016/j.jsv.2016.12.028
Last Modified:	09 Feb 2018 13:43
URI:	http://eprintspublications.npl.co.uk/id/eprint/7425

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