Communications – electrical: acoustic wave systems and devices – Transmitter systems – With beam forming – shaping – steering – or scanning
Patent
1994-01-25
1994-12-27
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Transmitter systems
With beam forming, shaping, steering, or scanning
367135, G01S 1500
Patent
active
053771664
ABSTRACT:
Each of the acoustic transducers (elements) of an array has a maximum dimension of less than .lambda.. They are located at the vertices of a regular polyhedron, which may be an icosahedron (12 elements), or a dodecahedron (20 elements). This placement effectively locates the elements on the surface of a sphere with diameter selected to provide an interelement spacing of .lambda./3 to 2.lambda./3. The signals are delayed for phasing to form directive "beams." A second array includes elements located at the vertices of a smaller polyhedron centered at the same point and included within the first array, and operated at a higher frequency than the outermost array. In order to reduce the effects of shadowing, the locations of the transducers of the smaller included array are selected to lie on radials passing through the centroids of the faces of the polygon defining the larger array.
REFERENCES:
patent: 3593818 (1971-07-01), Pohlmann
patent: 5239518 (1993-08-01), Kazmar
patent: 5258771 (1993-11-01), Praba
Ring et al., 1986 Volumetric Array Nicrad Final Report, prepared for Naval Underwater Systems Center, New London, Conn., Contract NICRAD-85-NUSC-022.
Jarzynski et al., Array Shading for a broadband constant directivity transducer, J. Acoust. Soc. Am. 64(5), Nov. 1978, pp. 1266-1269.
Brick, Discussion of transmitting directivity index for volumetric arrays, J. Acoust. Soc. Am. 92(1), Jul. 1992, pp. 585-588.
Chin Gay
Martin Marietta Corporation
Meise William H.
Pihulic Daniel T.
Young Stephen A.
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