Devices for probing by ultrasonic radiation

Details Devices for probing by ultrasonic radiation Devices for probing by ultrasonic radiation

1977-06-20

1978-09-26

Griffin, Robert L.

Communications: electrical

Selective

340 5H, 340 5MP, 340 6R, 343 17, 73606, 73607, 73626, 73628, 358112, 128 2V, 128 205Z, G01N 2904

Patent

active

041174461

ABSTRACT:
N elementary transducers are distributed regularly along a line of scanni An ultrasonic frequency receiver is associated with phase lag means. The distribution over n successive elementary transducers of the phases corresponding to focusing at a predetermined distance or several successive distances from the line is stored. That distribution corresponds to several Fresnel zones. Switches first connect a generator to a group of n' transducers corresponding to the central Fresnel zone of said stored distribution and later connect a group of n transducers to the receiver direct and via the phase lag means according to the stored distribution(s). The groups of n' and n elementary transducers are shifted along the line at intervals of time. The phase lag means may consist of inverter means causing a phase angle of .pi..

REFERENCES:
patent: 3820387 (1974-06-01), Grabendorfer
patent: 3856985 (1974-12-01), Yokoi
patent: 3911730 (1975-10-01), Niklas
patent: 3918025 (1975-11-01), Koshikawa et al.
patent: 3953825 (1976-04-01), Kimo et al.
patent: 4019169 (1977-04-01), Takamizawa

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