Joint sensing methods to reconstruct acoustic fields over space

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Optical interferometry makes it possible to measure acoustic fields, by exploiting the acoustooptic 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 soundfields 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 InterNoise20
PublisherInstitute of Noise Control Engineering
Publication date2021
Publication statusPublished - 2021
Event49th International Congress and Exposition on Noise Control Engineering - Virtual event, Seoul, Korea, Republic of
Duration: 23 Aug 202026 Aug 2020


Conference49th International Congress and Exposition on Noise Control Engineering
LocationVirtual event
Country/TerritoryKorea, Republic of
Internet address
SeriesInter-Noise Proceedings


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