Electrodynamic transducer head

US4596147A · kind A · utility

Assignee

• Nukem, LLC · DE

Inventors

• Ekkehard Behl · Alzenau, DE
• Gerhard Huschelrath · Laufach, DE
• Ewald Kowol · Reiskirchen, DE

Key dates

• Filing date: Jan 11, 1985
• Grant date: Jun 24, 1986
• Expiry date: Jan 11, 2005

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N29/2412
• WIPO field: Measurement
• WIPO sector: Instruments

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.