Electrical generator or motor structure – Educational or construction units or kits
Patent
1972-09-21
1976-07-27
Budd, Mark O.
Electrical generator or motor structure
Educational or construction units or kits
128 2V, 310 87, 310 91, 310 95, 310 96, 73 675R, 340 5MP, H01L 4108
Patent
active
039719626
ABSTRACT:
An ultrasonic transducer comprising a linear array of piezoelectric elements for converting a single line from a compressional acoustic image field to electrical impulses which, in turn, provide a means for converting the incident compressional image field to a visual representation. In order to match the configuration of the acoustic image field, the array of piezoelectric elements, in a preferred embodiment, has the configuration of an arc, that is, the array is arranged in a straight line in one plane and in an arc in a plane orthogonal to the first. The transducer is made up of a plurality of assemblies each of which is composed of segments of piezoelectric material each held in a supporting slot in a length of metal plate which slot is filled with a material selected to provide impedance matching between the piezoelectric material and the transmission medium. The array of piezoelectric elements is made from the piezoelectric segments by making fine cuts therein perpendicular to the supporting slot to form a plurality of piezoelectric "islands" and each island is electrically connected to utilization circuitry. In a preferred embodiment, an ultrasonic cylindrical lens is affixed to the supporting structure along the supporting slot and intermediate the piezoelectric array and the compressional acoustic image field to broaden the angular sensitivity pattern in the direction to compensate for the disparity between length and width (greater length) of piezoelectric elements or islands.
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Budd Mark O.
Faubion Urban H.
Stanford Research Institute
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