Ultrasonic transducer system

Details Ultrasonic transducer system Ultrasonic transducer system

1993-01-19

1994-04-05

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Transmitter systems

With beam forming, shaping, steering, or scanning

367 11, 367105, 12866101, G03B 4206

Patent

active

053011686

ABSTRACT:
An ultrasonic transducer is provided which has multiple apertures in at least the elevation direction, and preferably in both the elevation and azimuth direction. Each aperture has a selected focal length, with the focal length increasing with the size of the aperture. By transmitting multiple scan lines at a given angle using the different apertures and line splicing received echo signals, resolution is enhanced by utilizing only the portion of each received scan line for which the corresponding elevation aperture is focused. While different controlled elevation apertures may be utilized for transmit and receive, the same aperture is preferably used for both. Additional techniques are discussed for both further enhancing resolution and for mitigating the decrease in frame rate which results from shooting multiple scan lines at a given angle.

REFERENCES:
patent: 4140022 (1979-02-01), Maslak
patent: 4359767 (1982-11-01), Sachs et al.
patent: 4670683 (1987-06-01), t Horn
patent: 5105814 (1992-04-01), Drukarey et al.
David E. Schmieder et al "A Segmented Aperture Approach to High Resolution NMMW Imaging", two pages, Georgia Institute of Technology, Engineering Experiment Station, Atlanta, Ga 30332.

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