Electrodynamic transducer head

Details Electrodynamic transducer head Electrodynamic transducer head

1985-01-11

1986-06-24

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

G01N 2904

Patent

active

045961476

ABSTRACT:
An electrodynamic transducer head for the non-destructive ultrasonic testing of workpieces (12) comprises an electromagnet having a magnet yoke with an external pole shoe and an internal pole shoe (10, 14) surrounded by the external pole shoe. Exciting and receiving coils (16, 18) are arranged on these pole shoes. To enable the internal pole shoe (10, 14) to be placed directly on the workpiece (12) moving relative thereto without danger, these pole shoes are provided with a protective cap (20) surrounded by a protective ring (22), the end face of the protective ring (22) turned towards the workpiece (12) projecting beyond that of the protective cap.

REFERENCES:
patent: 3512402 (1970-05-01), Foster
patent: 4348903 (1982-09-01), Sato et al.
patent: 4450725 (1984-05-01), Yamaguchi et al.
patent: 4480477 (1984-11-01), Huschelrath et al.

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