Design of a new SOund Field Analysis Recorder (SOFAR) for isotropy quantification in reverberation chambers

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Abstract

This presentation describes the design of a new SOund Field Analysis Recorder (SOFAR) that will allow the quantification of isotropy in reverberation chambers used for standardized measurements of absorption coefficients. The device, placed in close proximity to the absorbing sample, enables the analysis of the directional properties of the sound field in the testing area and the characterization of the distribution of acoustic energy arriving on the sample. The measurement device consists of a movable gantry containing an array of 32 microphones, which can be automatically moved to scan the sound pressure field in a plane parallel to the absorber. The frame supporting the gantry can also be displaced in the vertical axis, enabling the collection of acoustic data in four parallel planes. The scanning procedure results in a total of 4,096 impulse responses measured in the volume above the test area. Based on the measured responses, the isotropy of the incident sound on the sample is determined, using an isotropy coefficient described in [J. Acoust. Soc. Am. 143(4), 2514-2526 (2018)]. A prototype of the SOFAR is evaluated in a newly designed 285 m3 reverberation chamber and the industrial applicability of the device is discussed.
Original languageEnglish
Title of host publicationProceedings of Inter-noise 2020
Number of pages9
Publication date2020
Publication statusPublished - 2020
Event49th International Congress and Exposition on Noise Control Engineering - Virtual event, Seoul, Korea, Republic of
Duration: 23 Aug 202026 Aug 2020
https://internoise2020.org/

Conference

Conference49th International Congress and Exposition on Noise Control Engineering
LocationVirtual event
CountryKorea, Republic of
CitySeoul
Period23/08/202026/08/2020
Internet address

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