System for transmitting ultrasonic waves
AssigneeBetriebsforschungsinstitut VDEh Institut fur angewandte Forschung GmbH
InventorsDietmar Oberhoff, Günther Coen, Ernst Luhn, Gerhard Lorenz
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Abstract
The invention relates to a transmitting system for the generation of ultrasonic waves for testing materials, comprising a controllable signal generator and an ultrasonic transducer, wherein the signal generator and the ultrasonic transducer are arranged in the immediate vicinity of one another, in order to provide a transmitting system for ultrasonic testing which has higher effectiveness and lower manufacturing costs than known transmitting systems.
Claims20
A transmitting system for generating ultrasonic waves in a test piece by electrodynamic/electromagnetic ultrasonic conversion which utilizes electromagnetic waves for inducing ultrasonic waves within the test piece, the transmitting system comprising a controllable signal generator and a plurality of transducers wherein the signal generator and each of the plurality of transducers are connected by low impedance leads, and the signal generator and the transducers are located in the immediate vicinity of one another, and wherein signals transmitted between the signal generator and the transducer are not amplified.
A transmitting system for generating ultrasonic waves in a test piece by electrodynamic/electromagnetic ultrasonic conversion which utilizes electromagnetic waves for inducing ultrasonic waves within the test piece, the transmitting system comprising a controllable signal generator and a plurality of transducer segments, wherein the signal generator and the transducer segments are connected by low impedance leads, and the signal generator and the transducer segments are located in the immediate vicinity of one another, and wherein an impedance of the transducer segments is such that a total pulse power available to a transmission transducer is substantially equal to the power applied to the transducer segments multiplied by the number of transducer segments.
A transmitting system for generating ultrasonic waves in a test piece by electrodynamic/electromagnetic ultrasonic conversion, comprising:
- a controllable signal generator capable of generating a signal;
- and
- at least one transducer segment connected to the controllable signal generator for receiving the signal therefrom and generating an electromagnetic wave for inducing an ultrasonic wave in the test piece, the transducer segment including a power switch connected to the controllable signal generator and controlling transmission of the signal from the controllable signal generator to the transducer segment;
- wherein an impedance of the transducer segment is such that a total pulse power available to a transmission transducer is substantially equal to the power applied to the transducer segment multiplied by the number of transducer segments.
A method of contactless ultrasonic testing of a test piece by electrodynamic/electromagnetic ultrasonic conversion, comprising:
- providing a signal generator and a transducer segment positioned closely adjacent to one another and electrically connected to each other by a low impedance lead, the transducer segment including a power switch;
- positioning the transducer segment adjacent to but not in contact with the test piece to be tested;
- using the signal generator to generate a signal and transmitting the signal to the transducer segment through the low impedance lead and the power switch without amplifying the signal;
- and
- generating an electromagnetic wave from the transmitted signal using the transducer segment for inducing an ultrasonic wave in the test piece;
- wherein an impedance of the transducer segment is such that a total pulse power available to a transmission transducer is substantially equal to the power applied to the transducer segment multiplied by the number of transducer segments.
A transmitting system as for generating ultrasonic waves in a test piece by electrodynamic/electromagnetic ultrasonic conversion which utilizes electromagnetic waves for inducing ultrasonic waves within the test piece, the transmitting system comprising a controllable signal generator and a plurality of transducer segments, wherein the signal generator and the transducer segments are connected by low impedance leads, and the signal generator and the transducer segments are located in the immediate vicinity of one another, and wherein an impedance of the transducer segments is such that a total pulse power available to a transmission transducer is substantially equal to the power applied to the transducer segments multiplied by the number of transducer segments, and wherein each said lead has a length of about 10 mm.
A transmitting system for generating ultrasonic waves in a test piece by electrodynamic/electromagnetic ultrasonic conversion which utilizes electromagnetic waves for inducing ultrasonic waves within the test piece, the transmitting system comprising a controllable signal generator and a plurality of transducer segments, wherein the signal generator and the transducer segments are connected by low impedance leads, and the signal generator and the transducer segments are located in the immediate vicinity of one another, and wherein an impedance of the transducer segments is such that a total pulse power available to a transmission transducer is substantially equal to the power applied to the transducer segments multiplied by the number of transducer segments, and wherein each said transducer segment comprises a power switch composed of a field effect transistor, and wherein the impedance of the transducer segments is matched to the power switches.
Dependencies are inferred from the claim text.