发明名称 |
DEVICES FOR PROBING BY ULTRASONIC RADIATION |
摘要 |
<p>N elementary transducers are distributed regularly along a line of scanning. 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..</p> |
申请公布号 |
CA1090914(A) |
申请公布日期 |
1980.12.02 |
申请号 |
CA19770280762 |
申请日期 |
1977.06.17 |
申请人 |
ANVAR (AGENCE NATIONALE DE VALORISATION DE LA RECHERCH E) |
发明人 |
ALAIS, PIERRE |
分类号 |
A61B8/00;G01N29/24;G01S15/89;G10K11/34;(IPC1-7):61B10/00 |
主分类号 |
A61B8/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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