The performance of anechoic rooms

Davy, J 2003, 'The performance of anechoic rooms', in Acoustics on the Move : WESPAC VIII conference : proceedings, Melbourne, Australia, 7-9 April 2003.

Document type: Conference Paper
Collection: Conference Papers

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Title The performance of anechoic rooms
Author(s) Davy, J
Year 2003
Conference name Proceedings of the Eighth Western Pacific Acoustics Conference
Conference location Melbourne, Australia
Conference dates 7-9 April 2003
Proceedings title Acoustics on the Move : WESPAC VIII conference : proceedings
Publisher Australian Acoustical Society
Place of publication Castlemaine, Australia
Abstract Measurements of the frequency response of a prototype microphone turbulence screen in an anechoic room showed greater than expected ripple. Investigations showed that this was due to the residual reflections from the anechoic lining. Since it is necessary to reduce the effects of inverse square law over the 400 mm length of the microphone turbulence screen slit, the receiver could not be placed close to the source in order to reduce the relative level of the reflections as is done in free field microphone calibrations. Because the ripple is a function of frequency and receiver position, the ripple was reduced by averaging the frequency response of the microphone turbulence screen over eight different receiver positions. Previous in situ methods of evaluating the performance of the anechoic lining have measured the variation of level with receiver position. The availability of digitally controlled and measured frequency sweeps and the above measurements suggests that it may be easier to measure the ripple as a function of frequency rather than receiver position when evaluating an anechoic lining. This paper will present some preliminary measurements over frequency and compare them with earlier measurements over receiver position, with tone burst measurements and with impedance tube measurements.
Subjects Acoustics and Acoustical Devices; Waves
Copyright notice © 2003 Australian Acoustical Society
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