Device for testing ferromagnetic materials

US6009756A · kind A · utility

Assignees

• Pipetronix BmbH · DE
• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Herbert Willems · Nalbach, DE
• Otto-Alfred Barbian · Blieskastel, DE
• Gerhard Hübschen · Saarlouis, DE

Key dates

• Filing date: Jul 11, 1997
• Grant date: Jan 4, 2000
• Expiry date: Jul 11, 2017

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2291/2636
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Device for testing ferromagnetic materials, such as pipelines and the like, for faults, cracks, corrosion, etc. An one electromagnetic ultrasonic transducer includes at least one high frequency current coil and an arraay of permanent magnets which create a magnetic field for exciting and/or detecting ultrasonic waves in the wall of the ferromagnetic material. The ultrasonic transducer is located between the pole pieces of an additional magnet arrangement that produces a magnetic prefield in the material wall.