Magnetic defectoscope with permanent magnets

The paper is intended for the theory of magnetic defectoscope of steel rope s, construction of this equipment and evaluation of measured data. The dete ctor module consists of magnetization head, sensing system and holder with optoelectronic rotary increment encoder. The wavelet transform - a new and promising method for defectoscope signal processing - is presented. It enab les to specify the changes of the rope cross-section with an accuracy level better than 0.5%. (C) 1999 Elsevier Science B.V. All rights reserved.