Electrodynamic sound converter

Details Electrodynamic sound converter Electrodynamic sound converter

1977-05-16

1979-02-13

Queisser, Richard C.

Measuring and testing

Vibration

By mechanical waves

G01N 2904

Patent

active

041388968

ABSTRACT:
An electrodynamic sound converter which comprises a magnet adapted to generate a magnetic field and direct same onto the surface of the workpiece to be checked by the electrodynamic sound converter, and which also includes an excitation coil located between the magnet and the workpiece to be checked for generating electromagnetic oscillations. That end of the magnet core of the magnet which faces the workpiece to be checked is so designed that the magnet core decreases in cross section toward its foremost point which is closest to the surface of the workpiece to be checked, the rate of increase increasing in the direction toward the foremost point of the magnet core.

REFERENCES:
patent: 3460063 (1969-08-01), Houck et al.
patent: 3583213 (1971-06-01), Houck et al.
patent: 3963980 (1976-06-01), Shkarlet

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