An orientation calibration procedure for two acoustic vector sensor configurations
conference paper
Acoustic vector sensors can be used for far field sound source localization, offering an alternative to far field beamforming. These sensors are able to measure the 3D acoustic particle velocity vector and the scalar value sound pressure. Two sensor configurations exist. The USP probe is based upon three orthogonally placed acoustic particle velocity sensors (Microflowns) and a single sound pressure sensor. In early 2009, also a completely integrated monolithic sound chip became available, where the 3D particle velocity vector is measured in a 2D configuration. With at least two of these 3D vector sensors, placed at a certain distance from each other, the location of a sound source in the three dimensional space can be determined. Such localization techniques can be based on the measurement of the three dimensional velocity or intensity vectors. Apart from ground impedance and meteorological conditions, an important condition for the accuracy of such methods is that the orientation of the vector sensor has to be accurately known. In this paper a procedure is described to calibrate the orientation of the vector sensor in the field during testing. The procedure is based on a number of measurements with sources placed at positions which are accurately known. Based on these measurements, an orientation calibration matrix is set up which is used for correcting the signals generated by unknown sources in the field. The procedure will be described and the results of experiments in an anechoic room will be presented.
TNO Identifier
462423
Publisher
International Institute of Acoustics and Vibration
Source title
16th International Congress on Sound and Vibration, ICSV16, Kraków, Poland, 5-9 July, 2009
Place of publication
Auburn, AL
Files
To receive the publication files, please send an e-mail request to TNO Repository.