Betriebsforschungsinstitut Vdeh Institut Fur Angewandte Forschung Gmbh

Betriebsforschunginstitut Vdeh-Institut Für Angewandte Forschung Gmbh

Betriebsforschungsinstitut Vdeh Institut for Angewandete Forschung Gmbh

Oberhoff, Dietmar

Flohr, Guido

Dietmar Oberhoff

Ernst Luhn

Gunther Coen

Roland Keck

Günther Coen

Gerhard Lorenz

Guido Flohr

Ernst Lunh

Fritz Isselstein

G&uuml;nther Coen

To reduce signal interference and improve the signal-to-noise ratio in the transmitted signal, the analog signals produced by an ultrasound transducer are promptly digitized. In accordance with the invention, the demodulator is already shielded from the ultrasound transducers, immediately after the preamplifier, which is itself shielded from the ultrasound transducers, by an analog to digital converter, for example.

Signal processing apparatus for an ultrasound transducer, ultrasound receiver and method for operating an ultrasound receiver

The invention relates to a method for non-destructive testing of materials, in which at least two differently guided waves (modes) are produced in the solid body, each at at least one specified angle, the measured reflection values are placed in relation to a reference echo in order to obtain a relative reflection value, and the relative reflection values of the individual modes are again placed in relation to one another, thereby enabling the size and type of the defects to be determined.

Defect type classifying method

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.

System for transmitting ultrasonic waves

There is disclosed an electromagnetic transducer for the transmission and ception of ultrasonic waves in the touchless testing of metal workpieces, particularly made of steel, in the shape of sheet and strip material. The transducer is arranged for continuous testing, particularly as applied to continuously advancing material, by wavelength spectroscopy and particularly modal spectroscopy of received ultrasonic waves. To this end, the transducer comprises a pair of transducer segments each of which has a set of mutually parallel conductor tracks formed on a substantially planar printed circuit board in which the frequencies and wavelengths for each segment can be preset in a matrix logic circuit having a short time sequence. The conductor tracks comprise windings arranged to be connected for operation through a set of switching elements in such a manner as to produce in various switching states of the switching elements a plurality of wavelengths for each frequency. The wavelengths being proportionally related to each other by small integral numbers.

Electromagnet transducer

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Leichlingen, Germany

Dietmar Oberhoff