Method of and device for material checking by ultra sound while

Details Method of and device for material checking by ultra sound while Method of and device for material checking by ultra sound while

1977-09-27

1979-08-21

Ruehl, Charles A.

Measuring and testing

Vibration

By mechanical waves

G01N 2904

Patent

active

041648730

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.

REFERENCES:
patent: 3583213 (1971-06-01), Houck
patent: 3850028 (1974-11-01), Thompson et al.

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