Multi-arm elliptic logarithmic spiral arrays having broadband and off-axis application
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United States of America Patent
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Jun 24, 2003
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app pub date -
Jan 18, 2002
filing date -
Jan 18, 2002
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Abstract
A multi-arm elliptic logarithmic spiral array that is particularly effective in off-axis beamforming applications. The array is formed by providing an elliptic logarithmic spiral and a plurality of concentric ellipses which intersect with angularly spaced apart sample points on the elliptic logarithmic spiral. An odd number of sample points are included on each ellipse. The array of the present invention is particularly effective in off-axis beamforming applications, such as aeroacoustic test applications within wind tunnels, where the location of the array is fixed and the source of noise is positioned off axis of the array.
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