Selfnoise Reduction in Acoustic Measurements with a Particle Velocity Sensor by Means of a Cross-Correlation Technique

J.W. van Honschoten, W.F. Druyvesteyn, R. Raangs, G.J.M. Krijnen, M.C. Elwenspoek

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    Abstract

    The Microflown is a thermal acoustic sensor which does not measure sound pressure but the accompanying particle velocity (see [1-5]). This particle velocity is deduced from a temperature difference between two heated wires. A drawback is the sensor’s lower signal-to-noise (S/N-) ratio at higher frequencies compared to pressure microphones. A method is presented to reduce the noise by utilisation of cross- instead of auto-correlation spectra of two Microflowns. Dependent on the number of data points used, improvements of the signal-to-noise-ratio as high as 30 dB have be attained. The bandwidth in which the sensor’s noise characteristics are comparable to those of current microphones, thus increases from about.
    Original languageEnglish
    Title of host publicationForum Acusticum Sevilla 2002
    Subtitle of host publication3rd European Congress on Acoustics, XXXIII Spanish Congress on Acoustics - TECNIACUSTICA 2002, Europan and Japanese Congress on Acoustis, 3rd Iberian Congress on Acoustics ; Sevilla, Spain, 16 - 20 September 2002
    EditorsAntonio Calvo-Manzano
    Place of PublicationSevilla, Spain
    PublisherSociedad Española de Acústica
    Number of pages6
    ISBN (Print)84-87985-06-8
    Publication statusPublished - 15 Sep 2002
    EventForum Acusticum Sevilla 2002 - Sevilla, Spain
    Duration: 16 Sep 200220 Sep 2002

    Conference

    ConferenceForum Acusticum Sevilla 2002
    CountrySpain
    CitySevilla
    Period16/09/0220/09/02

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