Communications: electrical – Selective
Patent
1974-10-17
1977-03-15
Farley, Richard A.
Communications: electrical
Selective
340 5H, 340 8FT, G01S 966
Patent
active
040127117
ABSTRACT:
An apparatus and method for recording acoustical holograms characterized by the transmitting transducers having a directional characteristic, a transducer, which is either the transmitting or the receiving transducer, is mounted for rotation about at least one and preferably two axes, and the apparatus includes a reflector, which has at least a parabolic cross section taken on a plane extending perpendicular to the one axis, surrounds the rotatable transducer. When using the rotatable transmitting transducer, a plurality of stationary receiving transducers are utilized and if the receiving transducer is mounted for rotation, a plurality of stationary transmitting transducers are provided. If the transducer is rotated at about a single axis, the reflector has an axis which is parallel to the axis of rotation so that the sound beams are focused into lines lying on a plane. If the transducer is rotated about two axes, the reflector is a parabolic reflector which focuses the sound beams emitted into points lying on the plane.
REFERENCES:
patent: 3159023 (1964-12-01), Steinbrecher
patent: 3632183 (1972-01-01), Haines et al.
patent: 3881466 (1975-05-01), Wilcox
patent: 3889226 (1975-06-01), Hildebrand
Farley Richard A.
Siemens Aktiengesellschaft
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