METHOD AND MEASURING DEVICE FOR MEASURING THICKNESS OF A FERROMAGNETIC METAL OBJECT

摘要

The invention relates to a method and a device for measuring thickness of ferromagnetic metal objects. According to the method, a pulse of current is generated in a core coil, the core forming a closed magnetic circuit together with at least a portion of the ferromagnetic metal object; further, the time constant is determined at an exponential voltage resulted from said pulse of current generated in the core coil; and, finally, thickness of the ferromagnetic metal object is determined on the basis of the time constant thus determined.

主权项

1. A method for measuring thickness of a ferromagnetic metal object comprising the steps below:
generating a pulse of current in a core coil, the core forming a closed magnetic circuit together with at least a portion of the ferromagnetic metal object; determining the time constant of an exponential voltage pulse generated in the core coil as a result of said pulse of current applied; determining thickness of the ferromagnetic metal object on the basis of the determined time constant.