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Design and testing of sound sources for phased microphone array calibration

Kröber, Stefan and Ehrenfried, Klaus and Koop, Lars (2008) Design and testing of sound sources for phased microphone array calibration. bebec2008 Berlin Beamforming Conference, 2008-02-19 - 2008-02-20, Berlin (Germany). ISBN 978-3-00-023849-9.

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The phased array technique is a powerful tool for the localisation and quantification of sound sources in aeroacoustic testing. The accuracy of the results is limited due to phase and sensitivity errors of the microphones. A reliable calibration procedure for the microphone array would enhance the applicability of the measurement technique. Currently, appropriate sound sources are lacking, especially for in-flow calibration. An ideal calibration sound source exhibits monopole characteristics and covers a frequency range up to 70 kHz. The present study reviews concepts for omni-directional sound sources and evaluates their capability for microphone array calibration. Two concepts of calibration sources with aerodynamic fairings for the use in wind tunnels have been developed. The radiated sound field of both probes was examined in experiments in an anechoic facility. The presented results comprise the spatial amplitude characteristics of the designed sound sources. In addition, beamforming with a synthetic microphone array was performed to analyse the phase characteristics.

Item URL in elib:https://elib.dlr.de/53342/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Design and testing of sound sources for phased microphone array calibration
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-18
Series Name:CD-ROM Conference Proceedings
Keywords:microphone array, aeroacoustic
Event Title:bebec2008 Berlin Beamforming Conference
Event Location:Berlin (Germany)
Event Type:international Conference
Event Start Date:19 February 2008
Event End Date:20 February 2008
Organizer:DLR, TU-Berlin; GFaI
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:28 Jul 2008
Last Modified:24 Apr 2024 19:16

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