G - Physics – 01 – N
Patent
G - Physics
01
N
324/50
G01N 27/90 (2006.01)
Patent
CA 1264354
"Process and device for detecting, by eddy currents, typical defects on a product" ABSTRACT OF THE DISCLOSURE This invention relates to a process and device for detecting by eddy currents, typical defect efects on a product in relative movement with detecting means, wherein an alternating magnetic field is generated in order to provoke the circulation of eddy currents on the surface of the product, a signal representative of the variations of the eddy currents is collected by means of a differential sensor and is demodulated by projection along an angle of adjustable phase in order to detect the disturbances introduced by the defects to be detected, this angle of phase being determined so that the projection of the collected signal has a minimum mean value, in order to eliminate disturbances of the collected signal due to repetitive surface irregu- larities; the component of the collected signal ob- tained by said projection is converted into digital form; the digital signal thus obtained is filtered by means of a digital filter whose characteristics are predetermined as a function of a type of defect to be detected; and a defect detection signal is emitted when the output signal of the digital filter exceeds a predetermined threshold.
490889
Institut de Recherches de La Siderurgie Francaise (irsid)
Marks & Clerk
LandOfFree
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