Acoustic imaging apparatus

Details Acoustic imaging apparatus Acoustic imaging apparatus

1977-12-20

1979-02-20

Queisser, Richard C.

Measuring and testing

Vibration

By mechanical waves

340 1R, 340 6R, G01N 2904

Patent

active

041400224

ABSTRACT:
An array of transducers is provided for transmitting pulses of ultrasonic pressure waves into a body and translating reflections received into corresponding pulses of electrical waves. Phase changing means, which may preferably include heterodyning means, are connected between each transducer and selected taps on one delay line. The taps are just close enough together to provide reasonable overlap of the pulses of electrical waves at the summing point at one end of the delay line. Focussing is attained by adjusting the phases of the waves applied to each tap so that the cycles of carrier wave within the overlapped portion of the pulses at the summing point have reasonable phase coherence.

REFERENCES:
patent: 3918024 (1975-11-01), Macovsi
patent: 3938502 (1976-02-01), Bom
patent: 4005382 (1977-01-01), Beaver
patent: 4012952 (1977-03-01), Dory
patent: 4084582 (1978-04-01), Nigam
B. S. McCartney, An Improved Electronic Sector-Scanning Sonar Receiver, Journal Brit. I.R.E., Dec. 1961, pp. 481-488, 340-346 R.

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