Weak Anderson localisation in reverberation rooms and its effect on the uncertainty of sound power measurements

Finn Jacobsen

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Abstract

The effect known as ‘weak Anderson localisation’, ‘coherent backscattering’ or ‘enhanced backscattering’ is a physical phenomenon that occurs in random systems, e.g., disordered media and linear wave systems, including reverberation rooms: the mean square response is increased at the drive point. In a reverberation room this means that one can expect an increase of the reverberant sound field at the position of the source that generates the sound field. This affects the sound power output of the source and is therefore of practical concern. However, because of the stronger direct sound field at the source position it is obviously very difficult to measure the effect directly. The ‘concentration factor’ is usually assumed to be 2, and the ‘modal kurtosis’ is assumed to be 3. This paper presents the results of an indirect experimental estimation of these two parameters, and discusses implications for the uncertainty of sound power measurements.
Original languageEnglish
Title of host publicationProceedings of Forum Acusticum 2011
Publication date2011
Publication statusPublished - 2011
EventForum Acusticum 2011 - Aalborg, Denmark
Duration: 26 Jun 20111 Jul 2011
http://www.fa2011.org/

Conference

ConferenceForum Acusticum 2011
CountryDenmark
CityAalborg
Period26/06/201101/07/2011
Internet address

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