A note on measurement of sound pressure with intensity probes

Peter Juhl, Finn Jacobsen

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Abstract

The effect of scattering and diffraction on measurement of sound pressure with "two-microphone" sound intensity probes is examined using an axisymmetric boundary element model of the probe. Whereas it has been shown a few years ago that the sound intensity estimated with a two-microphone probe is reliable up to 10 kHz when using 0.5 in. microphones in the usual face-to-face arrangement separated by a 12 mm spacer, the sound pressure measured with the same instrument will typically be underestimated at high frequencies. It is shown in this paper that the estimate of the sound pressure can be improved under a variety of realistic sound field conditions by applying a different weighting of the two pressure signals from the probe. The improved intensity probe can measure the sound pressure more accurately at high frequencies than an ordinary sound intensity probe or an ordinary sound level meter. ©2004 Acoustical Society of America.
Original languageEnglish
JournalJournal of the Acoustical Society of America
Volume116
Pages (from-to)1614-1620
ISSN0001-4966
DOIs
Publication statusPublished - 2004

Bibliographical note

Copyright (2004) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.

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