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In-Flow Calibration Approach for Improving Beamforming Accuracy

Kröber, Stefan and Ehrenfried, Klaus and Koop, Lars and Lauterbach, Andreas (2010) In-Flow Calibration Approach for Improving Beamforming Accuracy. Berlin Beamforming Conference Bebec2010, 24.02.-25.02.2010, Berlin, Germany. ISBN 978-3-00-030027-1.

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Official URL: http://www.bebec2010.com


The phased microphone array technique is a well established tool in aeroacoustic testing for the localisation and quantification of sound sources. The measurements are often carried out in closed or open wind tunnels using scaled models. In both types of wind tunnels flow effects derogate the accuracy of beamforming results. In the open test-section the sound waves have to pass through the wind tunnel shear layer before reaching the microphone. That results in a spatial coherence loss due to turbulent scattering and refraction and potentially leads to degraded source maps and under-estimated source levels. The present study addresses this matter and proposes a calibration approach for an open wind tunnel using an in-flow calibration source. The source employs a ribbon loudspeaker which can emit sufficiently high sound pressure levels in a broad frequency range and its properties are known. The presented results comprise details of the calibration procedure and their evaluation with respect to the achieved beamforming accuracy.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:In-Flow Calibration Approach for Improving Beamforming Accuracy
AuthorsInstitution or Email of Authors
Ehrenfried, KlausUNSPECIFIED
Lauterbach, AndreasUNSPECIFIED
Page Range:pp. 1-11
Series Name:Conference Proceedings
Keywords:phased microphone array, open test section, beamforming accuracy
Event Title:Berlin Beamforming Conference Bebec2010
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:24.02.-25.02.2010
Organizer:GFal, DLR und TU-Berlin
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:01 Mar 2010 14:10
Last Modified:21 May 2010 09:36

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