Patent ID: 6133731
Filing Date: 2000-10-17
Classification: B66B,G01N

Abstract:
Method for measuring the yield strength and/or tensile strength of ferromagnetic, elongated structures, including cables, the method comprising the steps of:creating at least a magnetic field that varies either as a function of time or as a function of position or both, along at least a given length of the structure;sensing a plurality of Barkhausen signals due to the time or position related variation of said magnetic field for each of a plurality of sections of the structure to be tested, measuring a set of values of the Barkhausen signal rate as a function of the value of the applied magnetic field for each said section; anddetermining the yield strength and/or tensile strength of each such section from said sensed Barkhausen signal rate measured for said section by calculation or by comparing the set of values to reference values obtained from a series of reference samples with known properties.