Measuring and testing – Vibration – By mechanical waves
Patent
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.
Beauchamp John P.
Hewlett--Packard Company
Queisser Richard C.
Timbie Donald N.
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