A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
349/36
A61B 10/00 (2006.01) G01S 15/89 (2006.01) G10K 11/34 (2006.01)
Patent
CA 1090914
ABSTRACT OF THE DISCLOSURE N elementary transducers are distributed regu- larly along a line of scanning. An ultrasonic frequency receiver is associated with phase lag means. The distribution over n successive elementary trans- ducers of the phases corresponding to focusing at a predetermined distance or several successive dis- tances 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 distribu- tion(s). The groups of n' and n elementary trans- ducers are shifted along the line at intervals of time. The phase lag means may consist of inverter means causing a phase angle of .pi..
280762
Anvar - Agence Nationale de Valorisation de La Recherche
Goudreau Gage & Associates
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