Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1987-08-05
1989-06-20
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367905, 310334, 73626, 12866006, G01S 968
Patent
active
048414921
ABSTRACT:
An apodization attenuation circuit to achieve a selected percent Gaussian apodization of a focused ultrasound wavefront when transmitted from a linear or phased array. The circuit uses a string of resistors, one resistor positioned between the drivers of each element in the transducer array. Each node of the resistor string functions as the reference potential input for one driver. Each node includes a pair of normally open switches, one of which may be closed to common and one of which may be closed to full reference potential. By closing four switches, two to common and two to full reference potential, a profile of potential of a selected percent Gaussian apodization can be achieved such that the output pulse magnitude of each transducer element in an aperture varies as a Gaussian function of its distance from the center of the aperture.
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Haken Jack E.
North American Philips Corporation
Sotomayor John B.
Tarcza Thomas H.
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