Title: Method of and device for material checking by ultra sound while employing an electrodynamic sound converter

Abstract: A method of and device for ultrasonically checking a workpiece while employing an electrodynamic sound converter including a checking head and a coil adapted to be energized to create a magnetic field, according to which during the checking operation the workpiece in a continuous movement relatively is passed by the testing or checking head of the electrodynamic sound converter. The coil for generating the magnetic field is energized by an alternating current or an intermittent or alternating direct current. Furthermore, the electrodynamic sound converter in conformity with the intensity of the magnetization of the coil is switched on and off in such a way that a sound converter is switched on when the magnetization has reached a predetermined value, and is switched off as soon as the magnetization drops below another predetermined value.

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Inventors: Bottcher, Wolfgang (Dortmund, DE, US)
Kopineck, Hermann-Josef (Dortmund, DE, US)

Application Number: 836964
Filing Date: 1977-09-27
Publication_date: 1979-08-21
Assignee: Hoesch Werke Aktiengesellschaft (Dortmund, DE)
Primary Class(es): 73/643
Other Classes:
US Patent Ref:

3583213	Jun, 1971	Houck	73/643.
3850028	Nov, 1974	Thompson et al.	73/643.

Other Refs:
Primary Examiner: Ruehl, Charles A.
Assistant Examiner:
Attorney: Becker & Becker