Device for utrasonically checking material by means of an electr

Details Device for utrasonically checking material by means of an electr Device for utrasonically checking material by means of an electr

1977-11-28

1979-04-17

Gill, James J.

Measuring and testing

Vibration

By mechanical waves

G01N 2904

Patent

active

041494210

ABSTRACT:
A device for checking materials by means of an electrodynamic converter which includes a magnet and at least one high frequency coil arranged between the core of the magnet and the workpiece. The high frequency coil includes a first section effective with regard to the generation of ultra sound, and a second section which is not effective with regard to the generation of ultra sound. In the first section the individual currents in the windings of the high frequency coil have approximately the same direction while the second section is located outside the magnetic field of the magnet or opposite the workpiece behind a shielding.

REFERENCES:
patent: 3583213 (1971-06-01), Houck
patent: 3786672 (1972-09-01), Gaerttner

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