A practical implementation of microphone free-field comparison calibration according to the standard IEC 61094-8

Salvador Barrera Figueroa, Antoni Torras Rosell, Knud Rasmussen, Finn Jacobsen, Vicente Cutanda Henriquez

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

    672 Downloads (Pure)

    Abstract

    An international standard concerned with the calibration of microphones in a free field by comparison has recently been published. The standard contemplates two main calibration methodologies for determining the sensitivity of a microphone under test when compared against a reference microphone. The two methodologies assume that the two microphones are exposed to the same sound pressure. This can be achieved by measuring the ratio of output voltages either sequentially or simultaneously. The first method requires a stable source to ensure that the sound pressure is approximately the same when the reference and test microphones are measured, whereas the second requires a source with a symmetrical directivity that ensures that the microphones placed at opposite positions are subjected to the same sound pressure. The two methods have been investigated experimentally in an extended frequency range. A third method, consisting of a combination of the sequential and simultaneous methodologies, has also been investigated. Though the application of time selective techniques is not discussed, the experimental results indicate the immunity to unwanted reflections in the sequential and combined approaches while it may be necessary to apply these techniques in the simultaneous approach.
    Original languageEnglish
    Title of host publicationINTER-NOISE 2012 Proceedings
    Number of pages13
    PublisherAcoustical Society of America
    Publication date2012
    Publication statusPublished - 2012
    Event41st International Congress and Exposition on Noise Control Engineering - Marriott Marquis, New York City, NY, United States
    Duration: 19 Aug 201222 Aug 2012
    Conference number: 41

    Conference

    Conference41st International Congress and Exposition on Noise Control Engineering
    Number41
    LocationMarriott Marquis
    Country/TerritoryUnited States
    CityNew York City, NY
    Period19/08/201222/08/2012

    Fingerprint

    Dive into the research topics of 'A practical implementation of microphone free-field comparison calibration according to the standard IEC 61094-8'. Together they form a unique fingerprint.

    Cite this