Development, validation and use of a computer-controlled system for the investigation of phase and amplitude shaded acoustic arrays
Butler, John D.
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A computer-controlled system for automated, remote measurement of phase and amplitude shaded doublet, triplet, and quadruplet acoustic arrays beam patterns was developed and tested. Experimental data were collected with an anechoic chamber to minimize backscatter and other interference effects. Preliminary impedance, reactance and resistance plots were made on several speakers to ensure that a matched set with similar characteristics was utilized for the arrays. Once the arrays were established, a computer program was developed for an HP-86 computer which allowed it to rotate the arrays, sample and collect data, and plot the results. Various combinations of amplitude and phase shading were applied to the dipole, tripole, linear quadrupole and quadratic quadrupole array. The results were then compared to computer generated beam patterns which agreed to i 2dB. This uncertainty was mainly generated by the slight deviations in the positioning of elements.
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