Sensor for stress and defect detecting system

Details Sensor for stress and defect detecting system Sensor for stress and defect detecting system

G - Physics

01

R

324/50

G01R 33/12 (2006.01) G01N 27/72 (2006.01) G01N 27/82 (2006.01)

Patent

CA 1236530

ABSTRACT OF THE DISCLOSURE A sensor for a system that detects stresses and defects in a metal piece by employing the Barkhausen phenomenon enables static or dynamic testing of such metal pieces as hard steel in which only low levels of Barkhausen noise can be generated or which are configured in one of a large variety of shapes. The sensor includes apparatus that ensures that a uniform time-varying magnetic field can be produced in all the metal pieces of a variety of shapes. The sensor can include an energizing coil assembly which generates the magnetic field in the metal piece having a core constructed from such a material in which a low level of magnetic noise is generated as ferrite. The level of the magnetic noise generated in the ferrite core is so low that, even if the magnetic noise is sensed by the sensing coil assembly, which receives the Barkhausen noise generated within the metal piece, that noise cannot interfere with the higher levels of Barkhausen noise generated in all ferromagnetic metals, including hard steel. The dynamic sensor has apparatus, such as wheel assemblies, for maintaining an air-gap of a substantially constant depth between the specimen and the energizing and sensing cores. The dynamic sensor can also include an energizing core which can be reoriented relative to the sensor to determine the directional characteristics of stress and defects in the specimen.

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