METHOD AND SYSTEM FOR DETERMINING THE DISTANCE BETWEEN A PROFILED SURFACE FROM A FUNCTIONAL SURFACE MOVING IN RELATION THERETO BY USING TWO MEASURING COILS

摘要

The invention relates to method and a system for determining the distance between a conducting surface which is profiled in the direction of distance determination and a functional surface moving in relation to said surface by using a measuring system. Two exploring coils are applied to an oscillator system and are connected on the output end to an analog-to-digital converter via a demodulator, said analog-to-digital converter being connected to an arithmetic module. The aim of the invention is to provide a method and a system which allow to effect a distance measurement substantially uninfluenced by the profile of the conducting surface and by variations in ambient temperature. For this purpose, a sensor (1) is used whose second exploring coil (3) is mounted on the first exploring coil (2) facing away from the surface (4) at a defined, known distance. An arithmetic module (31) calculates the distance of the functional surface from the profiled surface (4) using the digital measured values (N1, N2) of the two exploring coils (2, 3) and a digital reference value (N3) and the fixed distance.