A Numerical Investigation on the Performance of Sound Intensity Probes at High Frequencies

Vicente Cutanda Henríquez, Peter Møller Juhl, Finn Jacobsen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


The influence of diffraction on the performance of sound intensity probes has been examined using a boundary element model of an axisymmetric ‘two-microphone’ probe with the microphones in the usual ‘face-to-face’ arrangement. On the basis of calculations for a variety of sound field conditions and probe geometries it is concluded that the optimum length of the spacer between the microphones is about one microphone diameter; with this geometry the effect of diffraction and the finite difference error almost counterbalance each other up to about kΔr _ 2.2 under virtually any sound field condition that could be of practical importance in sound power determination. This corresponds to about 10 kHz for an intensity probe with half-inch microphones, which is an octave above what has hitherto been regarded as the upper frequency limit of this configuration.

The numerical results are confirmed by experiments.
Original languageEnglish
Title of host publicationProceedings of the Fourth International Congress on Sound and Vibration : http://www.iiav.org/
Number of pages8
PublisherInternational Institute of Acoustics and Vibration
Publication date1996
Publication statusPublished - 1996
Externally publishedYes


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