Multiple frequency annular transducer array and system

Details Multiple frequency annular transducer array and system Multiple frequency annular transducer array and system

1984-07-09

1986-02-11

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

G01N 2900

Patent

active

045692319

ABSTRACT:
A scanning system having a variable field of imaging uses a transducer array including a central element and one or more annular elements concentric therewith. The central element is energized at a first frequency for near field imaging, and the one or more annular elements are energized at lower frequencies for intermediate and far field imaging. Electrical signals generated by the transducer elements in response to reflected ultrasonic waves are demodulated to form in-phase and quadrature phase demodulated signals, and the in-phase and quadrature phase electrical signals are then summed to provide an enhanced image signal.

REFERENCES:
patent: 3292018 (1966-12-01), Clynes
patent: 4155259 (1979-05-01), Engeler
patent: 4241611 (1980-12-01), Specht et al.
patent: 4459853 (1984-07-01), Miwa et al.

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