Static pressure and temperature coefficients of working standard microphones

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedings – Annual report year: 2016Researchpeer-review

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The sensitivity of measurement microphones is affected by changes in the environmental conditions, mainly temperature and static pressure. This rate of change has been the object of previous studies focused on Laboratory Standard microphones. The literature describes frequency dependent values for these coefficients which are used for calibration purposes. Working standard microphones are not exempt of these influences. However, manufacturers usually provide a low frequency value of the environmental coefficient. While in some applications the influence of this coefficient may be negligible, in others it may be a significant contribution to the uncertainty of the measurement. Determining the environmental coefficients of individual specimens of measurement microphones can be a straightforward though time-consuming procedure provided the appropriate facilities are available. An alternative is to determine them using lumped parameter models or numerical calculations. Any of these possibilities require knowledge of the construction details of the microphones, particularly the geometry of the back cavity, and the properties of the membrane. This paper presents an introductory study of the effect of the environmental coefficients. For this purpose, the environmental coefficients of some commercially available microphones have been determined experimentally, and whenever possible, compared with the coefficients determined numerically using the Boundary Element Method.
Original languageEnglish
Title of host publicationProceedings of Inter-noise
EditorsWolfgang Kropp
Number of pages8
PublisherDeutsche Gesellschaft für Akustik
Publication date2016
ISBN (Electronic) 978-3-939296-11-9
Publication statusPublished - 2016
Event45th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2016 - Hamburg, Germany
Duration: 21 Aug 201624 Aug 2016
Conference number: 45
http://www.internoise2016.org/

Conference

Conference45th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2016
Number45
CountryGermany
CityHamburg
Period21/08/201624/08/2016
Internet address

    Research areas

  • BEM, Metrology, Microphones

ID: 125697753