Joint sensing methods to reconstruct acoustic fields over space

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Abstract

Optical interferometry makes it possible to measure acoustic fields, by exploiting the acousto-optic interaction, without using microphones or other electroacoustic transducers. Scanning interferometers can sample a sound field with high spatial resolution in an automated way. Therefore, optical interferometry is particularly suitable for measuring sound fields over space at mid and high frequencies, where sampling requirements make the use of microphones demanding and costly. However, optical methods are sensitive to vibrations of the equipment that biases the measurements, especially at low frequencies. In this study we propose a joint sensing approach that combines data acquired with conventional microphones as well as with an optical interferometer. The robustness and qualitative accuracy at low frequencies is improved due to the microphone data, whereas the sound field at higher frequencies is successfully captured over space with the scanning interferometer. In an experimental study, a three dimensional acoustic field is sampled combining the two sensing methods. The results show that the frequency range in which the reconstruction is correct is extended using the joint microphone-interferometer measurements.

Original languageEnglish
Title of host publicationProceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020
EditorsJin Yong Jeon
PublisherKorean Society of Noise and Vibration Engineering
Publication date23 Aug 2020
ISBN (Electronic)9788994021362
Publication statusPublished - 23 Aug 2020
Event49th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2020 - Seoul, Korea, Republic of
Duration: 23 Aug 202026 Aug 2020

Conference

Conference49th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2020
CountryKorea, Republic of
CitySeoul
Period23/08/202026/08/2020
SeriesProceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020

Bibliographical note

Funding Information:
The authors would like to thank Salvador Barrera-Figueroa from DFM for letting us the LDV. This study was supported by the VILLUM foundation (grant number 19179).

Publisher Copyright:
© Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020. All rights reserved.

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