Electrodynamic sound converter

Details Electrodynamic sound converter Electrodynamic sound converter

1980-11-20

1982-07-06

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

324262, G01N 2904

Patent

active

043376622

ABSTRACT:
An electrodynamic sound converter is disclosed for the non-destructive ultrasonic testing of workpieces during relative movement of the workpiece and the testing head. The testing head has an annular electromagnet which produces a magnetic field, and a rod-shaped core extends coaxially through the electromagnet and has a tip which projects beyond the same in direction towards the workpiece to be tested. The core is axially slidable relative to the electromagnet towards and away from the workpiece and the electromagnet and the tip of the core are each independently maintained at a fixed predetermined spacing from a surface of the workpiece being tested. The tip is being biased towards the surface, and a high-frequency coil is located adjacent the tip and serves to produce electromagnetic oscillations. Various modifications are also disclosed.

REFERENCES:
patent: 4258319 (1981-03-01), Shimada et al.
patent: 4314203 (1982-02-01), Haberlein

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