Method of providing ultrasound electrical impedance matching circuits
AssigneeVermont Electromagnetics Corp.
InventorsBernard R. Tolmie, Mark Haviland, Paul Smith
Life of this patent
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Abstract
The method of providing ultrasonic electrical impedance matching circuits is designed to provide the ability to analyze a large number of variable parameters in order to obtain a quick and simplified read out for the tuning of ultrasonic signals. This is done in order to evaluate these signals based upon the electrical model of an ultrasound system. A computer program is disclosed that provides the basis for this method and results in a highly accurate and immediate analysis of the ultrasound system.
Claims7
A method of providing ultrasound electrical impedance matching circuits, for use in order to evaluate the effectiveness of the operating circuit, comprising the steps of:
- storing in a software package an electrical model of an ultrasound system in a transmitting mode which gives values to a system generator output voltage, a system output impedance, a transducer input impedance, a voltage at the transducer and a cable system;
- storing in a software package an electrical model of an ultrasound system in a receiving mode which gives values to the impedance of the receiver, the transducer output impedance, the transducer's induced voltage, the voltage at the receiver and the cabling system;
- modeling the transducer and the transmitting/receiving switch;
- determining design frequency impedances;
- calculating a cable characteristics impedance at a design frequency from a measured cable input data;
- determining a cable matrix at the design frequency;
- assigning a system receiver impedance to a cable length and calculating a input impedance to a cable and receiver;
- assigning a transducer electrical impedance to source impedance calculating output impedance of a transducer and cable;
- determining an end to insert the matching network;
- transforming the transducer or transmitting/receiving switch to the other end of the transmission line;
- calculating the matching network comprised of inductors and capacitors with a specific design method based upon fixed and transformed impedances;
- inserting the matching network into the ultrasound system;
- and
- analyzing and evaluating the ultrasound system.
Dependencies are inferred from the claim text.