Abstract
A new type of parametric acoustic source configuration utilizes an endfire projector for the primary beam. This configuration shows promise for those applications requiring a projector having small frontal area, e.g., a source to be towed. A small endfire projector consisting of 20 half-wavelength elements at 30 kHz in line with 20 half-wavelength elements at 35 kHz was built and tested at NUSC’s Dodge Pond and Seneca Lake test facilities. Difference-frequency data at 5 kHz, as well as 3 and 7 kHz, are presented. Although the source levels are in agreement with the theory, the measured beams are narrower than predicted, even though accounting is made for the nonideal nature of the primary beams. This discrepancy could be due to a primary-beam phase effect. An aperture factor for endfire projectors is calculated.
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