Ring sensors for propagating wave detection in ducts

Marko Antila, Jari Kataja, Veli-Jukka Ollikainen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    Abstract

    Acoustic sensors are an important part in an active noise control system in ducts. Flush mounted or wire suspended pressure microphones are commonly used sensors to both detect the primary sound field and to measure the remaining error signal. Such sensors detect the sound pressure at a single point. They operate adequately if the duct properties are close to the ideal ones and the propagating wave is a plane wave. If the duct differs from the ideal one or the operating frequency range is above the first diametrical mode, large area sensors or sensor arrays are beneficial for detecting the propagating wave. We modeled and simulated the propagation of sound in a semiinfinite duct and the influence of the sound on the sensors. We used the regular laboratory pressure microphones as references and we also constructed circular sensors. The operation of the sensors was measured and the results analyzed.
    Original languageEnglish
    Title of host publication Internoise 2001: Proceedings of the 2001 International Congress and Exhibition on Noise Control Engineering
    PublisherInstitute of Noise Control Engineering
    Pages1608-1611
    Number of pages4
    ISBN (Print)90-806554-3-0, 90-806554-2-2
    Publication statusPublished - 2001
    MoE publication typeB3 Non-refereed article in conference proceedings
    EventInternational Congress and Exhibition on Noise Control Engineering, Inter-Noise 2001 - The Hague, Netherlands
    Duration: 27 Aug 200130 Aug 2001

    Conference

    ConferenceInternational Congress and Exhibition on Noise Control Engineering, Inter-Noise 2001
    CountryNetherlands
    CityThe Hague
    Period27/08/0130/08/01

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