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Title
Vorrichtung zur Pruefung von ferromagnetischen Materialien
Date Issued
2004
Author(s)
Willems, H.
Barbian, O.A.
Huebschen, G.
Patent No
1995-19543481
Abstract
The tester incorporates two stray flux magnetisation units (3,4) in the form of U-shaped permanent magnets with axially aligned pole pieces (5,5',6,6') joined by a yoke (7,8). One unit (3) has an electromagnetic ultrasonic transducer (9) radiating at right angles to the static magnetic field. Another transducer (11) radiates parallel to the static field from a position between the neighbouring opposite poles of the two units. The function of these is solely to premagnetise the material under investigation and to measure the stray flux. USE - In pipelines (2) or similar structures. Sufficient signal/noise ratio is achieved by suppression of Barkhausen noise when transducers are moved.
Language
de
Patenprio
DE 1995-19543481 A: 19951122