Author： Smith R. P.
Publisher： S. Hirzel Verlag
ISSN： 1610-1928
Source： Acta Acustica united with Acustica, Vol.23, Iss.1, 1970-01, pp. : 21-26
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Abstract
A simple and inexpensive technique for maintaining the beamwidth of a transducer constant, over frequency bands up to an octave in width, is described. Theoretical and experimental results are presented. With the aid of a simple passive network, the half-power beamwidth of an array may be held constant to within 2% over an octave band, with negligible variation of beam shape. This latter characteristic allows virtually undistorted reception of broad band acoustic pulses over the entire angle of the main lobe of the directional pattern. A compensation network designed for a particular frequency band may be used, without modification, for linear arrays of any length, and thus any beamwidth, within that band. The constant beamwidth technique is applicable to arrays with as few as four independent sections, as is demonstrated by the experimental results reported herein. Compensation for beamwidth variation in both horizontal and vertical planes is possible with a single network.
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