Abstract
A high‐frequency omnidirection source has been designed that enables three‐dimensional position monitoring in air to be performed. The source consists of a piezoelectric disk sandwiched between the large ends of two solid exponential Webster horns. When appropriately housed and driven to longitudinal resonance, the narrow end of one of the horns can be modeled as a baffled piston. Because of the high driving frequency (301 kHz) and the small radius of the horn, the directivity pattern of the source contains no nodes. Preliminary data regarding the sound field produced by the source were presented previously [J. Leifer and I. J. Busch‐Vishniac, J. Acoust. Soc. Am. Suppl. I 85, S115 (1988)]. Since that time, a more quantitative study of the source field has been performed, the results of which are presented here. It was found that the horns did not resonate exactly at the theoretically calculated frequency so a mechanical tuning process had to be employed. The predicted and achieved resonant frequency of the source differs by about 7%. [Work supported in part by General Motors Research Laboratories.]
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