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.
|Title of host publication||INTER-NOISE and NOISE-CON Congress and Conference Proceedings, InterNoise01|
|Publisher||Institute of Noise Control Engineering|
|Number of pages||4|
|Publication status||Published - 2001|
|MoE publication type||B3 Non-refereed article in conference proceedings|
|Event||Inter-Noise 2001 - Haag, Netherlands|
Duration: 27 Aug 2001 → 30 Aug 2001
|Period||27/08/01 → 30/08/01|
Antila, M., Kataja, J., & Ollikainen, V-J. (2001). Ring sensors for propagating wave detection in ducts. In INTER-NOISE and NOISE-CON Congress and Conference Proceedings, InterNoise01 (pp. 1608-1611). Institute of Noise Control Engineering.