Array shading for a broadband constant directivity transducer

Details Array shading for a broadband constant directivity transducer Array shading for a broadband constant directivity transducer

1979-11-14

1982-05-04

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

67153, H04B 1300

Patent

active

043285694

ABSTRACT:
A broadband directional transducer which provides a beam pattern that is essentially constant for all frequencies above a certain cutoff frequency, an acoustic pressure angular distribution that is virtually independent of the distance from the transducer and no side lobes, includes an array of isophase, omnidirectional electro-acoustic elements on a spherical shell, each element being amplitude-shaded according to the shading function ##EQU1## where n is a positive integer, and .theta. is an angle measured from the axis of the spherical surface to a shaded element.

REFERENCES:
patent: 3805226 (1974-04-01), Halloway
patent: 4156863 (1979-05-01), Madison
Jarzynski et al, "Array Shading for a . . . Transducer", 11/10/78, pp. 121269, J. Acoust. Soc. Am., vol. 64, #5.
Trott, "Design Theory for a . . . Transducer", 9/75, NRL Report 7933, ntis AD-AO 18 052list, 11/15/75.
Rogers et al, "New Approach to a . . . Transducer", 7/78, pp. 34-43, J. Acoust. Soc. Am., vol. 64, #1.
Van Buren, "Design Manual for a . . . Interim Report," 10/11/79, NRL Report 8329, pp. 1-34.

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