Acousto-optic sensing of the sound field in a lightly damped room

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Microphone arrays are a powerful means to capture and analyse the spatiotemporal properties of a sound field. The measurement principle is based on a discrete (point-wise) sampling of the sound field, which makes it ill-suited for measuring over large regions of space, e.g. in rooms or other three-dimensional domains of considerable extent. In this study we introduce a method to measure the sound field in a room using the acousto-optic effect. The sensing principle exploits the fact that acoustic pressure fluctuations induce changes in the refractive index of air, and this makes it possible to sense the acoustic field from optical laser measurements. This is inherently a spatial sensing method that enables to capture the sound field over an extended region of space. Furthermore, the sound field can be measured remotely, reaching locations of the room that are not easily accessible by conventional means. In this study we introduce the reconstruction method and assess the quality of the estimated sound field.
Original languageEnglish
Title of host publicationNoise control for a better environment : Proceedings of Internoise 2019
PublisherInternational Institute of Noise Control Engineering
Publication date2020
ISBN (Print)978-84-87985-31-7, 978-1-7138-0027-9
Publication statusPublished - 2020
Event48th International Congress and Exhibition on Noise Control Engineering - Palacio Municipal de Congresos de Madrid, Madrid, Spain
Duration: 16 Jun 201919 Jun 2019
Conference number: 48


Conference48th International Congress and Exhibition on Noise Control Engineering
LocationPalacio Municipal de Congresos de Madrid
Internet address


  • Acousto-optic
  • Microphone arrays
  • Sensing methods
  • Signal processing
  • Tomography


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