Environmental coefficients of the free-field sensitivity of measurement microphones

Research output: Research - peer-reviewArticle in proceedings – Annual report year: 2017

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The sensitivity of measurement microphones, both pressure and free field, is affected by changes in the environmental conditions, mainly temperature and static pressure. Static pressure and temperature coefficients for the pressure sensitivity have been the object of previous studies focused on Laboratory Standard microphones and few working standard microphones. The literature describes frequency dependent values for these coefficients which are used for calibration purposes. However, there is no description of the environmental coefficients of the free-field sensitivity though there have been some implementations that attempt to take care of the differences between the coefficients for the two types of sensitivities. Measuring the coefficients in a free field poses some challeng; it is not so easy to change neither the static pressure nor the temperature inside anechoic room within the range usually needed for a robust determination of the coefficients. Analysis of data gathered through a sufficiently large number of measurements has been suggested. This paper proposes an experimental procedure for the determination of the free-field sensitivity coefficients which makes use of the existing facilities used for the determination of the pressure sensitivity coefficients. Results are compared, whenever possible with numerical calculations of the microphones involved, and with alternative procedures based on the knowledge of the pressure sensitivity coefficients, diffraction of the microphone, and the load of the microphone impedance due to the radiation impedance.
Original languageEnglish
Title of host publicationProceedings of Internoise 2017
Number of pages9
Publication date2017
StatePublished - 2017
EventInternoise 2017 - Hong Kong Convention and Exhibition Centre, Hong Kong, Hong Kong
Duration: 27 Aug 201730 Aug 2017

Conference

ConferenceInternoise 2017
LocationHong Kong Convention and Exhibition Centre
CountryHong Kong
CityHong Kong
Period27/08/201730/08/2017

    Research areas

  • Microphone, Microphone calibration, Microphone sensitivity
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