Device for testing ferromagnetic materials

G - Physics – 01 – N

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Details

G01N 29/04 (2006.01) G01N 27/90 (2006.01) G01N 29/24 (2006.01)

Patent

CA 2209899

Device for testing ferromagnetic materials, such as pipelines and the like, for faults, cracks, corrosion, etc., with at least one electromagnetic ultrasonic transducer with at least one high frequency current coil in connection with a magnetic field for exciting and/or detecting ultrasonic waves in the material wall and at least one magnet system producing the magnetic field, characterized in that the ultrasonic transducer is located between the pole pieces of different polarity of an additional magnet arrangement producing a magnetic prefield in the material wall.

L'invention concerne un dispositif permettant de vérifier des matériaux ferromagnétiques, tels que des canalisations ou similaires, pour détecter d'éventuels défauts, fissures, phénomènes de corrosion ou similaires. Ce dispositif comprend au moins un transducteur ultrasonore électromagnétique formé par au moins une bobine d'intensité haute fréquence utilisée conjointement avec un champ magnétique pour activer et/ou détecter des ondes ultrasonores, et par au moins un système magnétique produisant un champ magnétique. Ce dispositif se caractérise en ce que le transducteur ultrasonore est monté entre les zones polaires de polarité différente d'un système magnétique additionnel produisant un champ préliminaire magnétique dans la paroi du matériau.

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