Characterization of acoustic diffusion using refracto-vibrometry

Jackett, R; Piper, B; Hughes, RJ

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.

Citation

Jackett, R., Piper, B., & Hughes, R. (2017). Characterization of acoustic diffusion using refracto-vibrometry. Journal of Sound and Vibration, 392, 70-76. https://doi.org/10.1016/j.jsv.2016.12.028

• Journal Article Type: Article
• Acceptance Date: Dec 16, 2016
• Online Publication Date: Dec 20, 2016
• Publication Date: Mar 31, 2017
• Deposit Date: Dec 11, 2019
• Publicly Available Date: Dec 11, 2019
• Journal: Journal of Sound and Vibration
• Print ISSN: 0022-460X
• Publisher: Elsevier
• Volume: 392
• Pages: 70-76
• DOI: https://doi.org/10.1016/j.jsv.2016.12.028
• Publisher URL: https://doi.org/10.1016/j.jsv.2016.12.028
• Related Public URLs: https://www.sciencedirect.com/journal/journal-of-sound-and-vibration