| 摘要 |
Method for measuring parameters in ferromagnetic steel structures, e.g. railway rails and drillpipes, to detect mechanical stress, damage or deterioration. On the monitored area devices for magnetization or demagnetization e.g. an electromagnet, will be installed according to need . Two or more electrodes for feeding of current, whereby a pulse shaped electrical voltage is applied. On another pair of electrodes the potential drop is measured. This voltage drop is compared with another voltage drop measured at known measurement conditions or is compared with calibration data for the object. The deviation between these voltages is analysed to quantify the relative or absolute deviations and based on this, the condition of the steel structure is estimated. The device can measure the transient voltage curves with reference to one or more of the magnetization curves and it includes algorithms for analysing the voltage response curve for determination of mechanical stress and/or fatigue and/or cracks and/or metal loss in steel materials.
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