Acousto-optic sensing for near-field acoustic holography

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Near-field acoustic holography (NAH) is a very powerful and widely used technique for the study of complex acoustic radiators. NAH enables to quickly understand how a complex source radiates into the medium. The technique is particularly suitable at low frequencies. At high frequencies, a dense transducer interspacing is required, and the measurement microphones can disturb the studied sound field when their size is comparable to the acoustic wavelength. In this study we examine the use of acousto-optic sensing in NAH. Acousto-optic sensing uses light beams as the sensing element, making it possible to acquire remote and non-invasive measurements without introducing extraneous objects in the vicinity of the source. The pressure, particle velocity and intensity fields, as well as the sound power radiated by a complex source, are determined from measurements in the near-field with an optical interferometer. The presented results demonstrate the potential of optical sensing to non-intrusively characterize sound fields, particularly at high frequencies.
Original languageEnglish
Title of host publicationProceedings of Internoise
Number of pages10
Publication date2022
ISBN (Print)978-1-906913-42-7
Publication statusPublished - 2022
Event 51st International Congress and Exposition on Noise Control Engineering - Scottish Event Campus, Glasgow, United Kingdom
Duration: 21 Aug 202224 Aug 2022


Conference 51st International Congress and Exposition on Noise Control Engineering
LocationScottish Event Campus
Country/TerritoryUnited Kingdom
Internet address


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