Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Uwe Lieske

Lars Schubert

Bernd Koehler

Bianca Weihnacht

Tobias Gaul

Olaf Roeder

Frank Schubert

Bernd Frankenstein

Constanze Tschoepe

Thomas Klesse

Robert Neubeck

Bernd KÖHLER

Constanze Tschöpe

Olaf RÖDER

A method for non-destructive testing of walls of components, at least one ultrasonic transducer () which is fixed to a surface of the wall is used to emit horizontally polarized transverse waves () in a lateral propagation direction and compression waves or vertically polarized transverse waves () in a radial propagation direction. The at least one ultrasonic transducer () and/or at least one further ultrasonic transducer arranged at a known distance from the at least one ultrasonic transducer () on the respective wall of the component () is/are used to detect horizontally polarized transverse waves () reflected by defects and compression waves or vertically polarized transverse waves () after or while running the non-destructive testing of the wall in order to determine the respective wall thickness.

Method for non-destructive testing of walls of components

In the system, two ultrasonic transducers, which form a pair and each have a piezoelectric ceramic plate-shaped element with a rectangular geometry, can be fastened to a surface of a component. The two ultrasonic transducers are arranged at a distance from one another such that there is no direct mechanical contact and they are arranged beside one another with a parallel orientation of their central longitudinal axes. The two elements have a different polarization along their width and are connected with the same polarity to an electrical voltage source. The two plate-shaped elements can also have an identical polarization along their width and can be connected in this case with opposite polarity to an electrical voltage source. At least one ultrasonic transducer and/or at least one further ultrasonic transducer is/are designed to detect ultrasonic waves reflected by defects and/or shear waves simultaneously emitted by the two ultrasonic transducers.

System for the non-destructive testing of components

Embodiments of the present invention provide a device for obtaining information about one or more living beings. The device comprises an actuator, a sensor and an evaluator. The actuator is configured to output an excitation signal for exciting the living being(s). The sensor is configured to detect a signal generated by the living being(s) in reaction to the excitation signal, to obtain a detected signal. The evaluator is configured to evaluate the detected signal so as to obtain the information about the living being(s).

Device and method for obtaining information about one or more living beings

The invention relates to an assembly for nondestructive material testing with which shear waves are emitted and detected in elastic surfaces of components or workpieces, in which piezoelectric transducer elements are arranged above one another in multiple planes and the piezoelectric transducer elements arranged in adjacent planes can each be operated oppositely to one another. The piezoelectric transducer elements can be piezoelectric fibers and/or piezoelectric plate-like elements that are connected to or embedded in an elastically deformable material.

Assembly for nondestructive material testing

Growing community of inventors

Dresden, Germany

Uwe Lieske