Ultrasonic system for the visual display of a thin section of a body
First Claim
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1. System for visually displaying the image of a thin section of a body by ultrasonics, said system comprising:
- an ultrasonic generator, a scanning probe and means for visual display of said image;
said system further comprising a frequency-converter ultrasonic lens made up of a first array of N bulk wave electromechanical transducers forming said scanning probe, a group of N frequency conversion circuits connected to a common local oscillator and a second array of N surface-wave electromechanical transducers arranged on a substrate;
said first and second arrays of transducers having their corresponding transducers interconnected two-by-two by said frequency conversion electrical circuits so as to constitute a transmission link having N channels in which N electrical signals circulate;
the frequency of said bulk waves being equal to the difference between the frequency of said surface waves and that of the signal produced by said local oscillator;
the surface of the substrate carrying said second array of N transducers being equipped with at least one third array of surface-wave electromechanical transducers which, imaged by said frequency converter ultrasonic lens, carries out discrete scanning of the section through focussing the ultrasonic energy exchanged between said ultrasonic generator and said visual display means.
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Abstract
The invention relates to ultrasonic systems for the visual display of a thin section of a body. The subject of the invention is a system wherein the multi-element scanning probe which picks up or transmits the ultrasonic energy cooperates with an array of elastic-surface-wave transducers and with a group of frequency converter circuits in order to constitute an ultrasonic lens. The invention is more particularly applicable to the non-destructive examination of bodies permeable to ultrasonic energy such as is practiced for example in medicine and when industrial goods are being checked.
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Citations
17 Claims
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1. System for visually displaying the image of a thin section of a body by ultrasonics, said system comprising:
- an ultrasonic generator, a scanning probe and means for visual display of said image;
said system further comprising a frequency-converter ultrasonic lens made up of a first array of N bulk wave electromechanical transducers forming said scanning probe, a group of N frequency conversion circuits connected to a common local oscillator and a second array of N surface-wave electromechanical transducers arranged on a substrate;
said first and second arrays of transducers having their corresponding transducers interconnected two-by-two by said frequency conversion electrical circuits so as to constitute a transmission link having N channels in which N electrical signals circulate;
the frequency of said bulk waves being equal to the difference between the frequency of said surface waves and that of the signal produced by said local oscillator;
the surface of the substrate carrying said second array of N transducers being equipped with at least one third array of surface-wave electromechanical transducers which, imaged by said frequency converter ultrasonic lens, carries out discrete scanning of the section through focussing the ultrasonic energy exchanged between said ultrasonic generator and said visual display means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- an ultrasonic generator, a scanning probe and means for visual display of said image;
Specification