FEM/BEM modeling of microphones and its application to acoustic primary metrology

Vicente Cutanda Henríquez, Manuel Sobreira Seoane

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

Abstract

Acoustic primary calibration of microphones under free-field conditions is performed by reciprocity, using microphones in pairs, one working as emitter and the other as receiver. The microphones are placed in an anechoic chamber. Considering the extreme accuracy required in this kind of measurement, every minute detail of the setup must be considered. In this framework, numerical modeling of the inside of the microphones and the outside domain can provide important clues for understanding the behavior of the system and finding ways of improving its performance, that is, reducing its uncertainty. This is especially needed at high frequencies, where the diaphragms have a complex movement and the wavelength becomes comparable to the size of the microphones. The usual assumptions, such as considering the microphones as point sources, are invalid in that range. The paper will deal with a coupled numerical implementation of this kind of measurement, taking into account the internal losses in the microphone, the diaphragm movement and the coupling with the exterior.
Original languageEnglish
Title of host publicationProceedings of Inter-Noise 2003 : http://www.i-ince.org/
Number of pages6
PublisherThe International Institute of Noise Control Engineering
Publication date2003
Pages671-676
Publication statusPublished - 2003
Externally publishedYes

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