Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1982-02-18
1984-02-14
Miller, J. D.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
7386125, 128663, 310369, H01L 4104
Patent
active
044319363
ABSTRACT:
Transducer structures for use in volume flow measurements which generate a first uniform beam and a second focused beam within the uniform beam. The transducer may include concentric elements, a linear array, or combinations thereof. In a two element concentric array, a central disc generates a uniform beam and a peripheral annular element having a lens thereon defines a second focused beam within the first beam. In a linear array, a plurality of juxtaposed linear elements define a scan surface, and a segmented element within the linear element array defines a focused reference sample volume within the scanned surface. A concentric array having a plurality of annular elements is driven with amplitude weighting of each element, in accordance with a Fourier-Bessel approximation to the desired beam pattern, thereby electronically achieving ultrasonic beam width control.
REFERENCES:
patent: 3327286 (1967-06-01), Dorr et al.
patent: 3888238 (1975-06-01), Meindl et al.
patent: 4051455 (1977-09-01), Fowler
patent: 4062237 (1977-12-01), Fox
patent: 4228687 (1980-10-01), Fraser
Fu, C., et al., "Annular Arrays for Quantitative Pulsed-Doppler Ultrasonic Flowmeters", Ultrasonic Imaging, vol. 5, 1983, pp. 1-16.
Hottinger and Meindl, "Blood Flow Measurement Using the Attenuation-Compensated Volume Flow Meter", Ultrasonic Imaging, vol. No. 1, 1979.
Defranould, P., et al. "Design of a Two Dimensional Array for B and C Ultrasonic Imaging System", 1977 Ultrasonics Symposium Proceedings, IEEE Cat. 11 77 CH 1264-ISU, pp. 259-263.
Fu Chong-Cheng
Gerzberg Levy
Miller J. D.
Rebsch D. L.
The Board of Trustees of the Leland Stanford Junior University
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