An eddy current sensor and a method of using an eddy current sensor

摘要

A method of using an eddy current sensor to provide an indication of a displacement-dependent parameter of a target object 2, by interaction between the target object 2 and a planar sensor coil 3. The target object 2 is moved through an opening in the sensor coil 3, whereby the field strength in the area of the flat coil 3 changes as the target object 2 moves. Magnetic field changes are detected by an evaluation circuit (14, figure 4) and transmitted to a microcontroller (13, figure 4) which processes the signals of the evaluation circuit (14, figure 4) and provides the latter with said signals via an output and protection circuit The target object 2 is moved axially through the coil. The target object may have a varying geometry with a continuously changing cross section, for example a conical shape. The eddy current sensor may be disposed in a sleeve or tubular secition and may be provided with a printed circuit board. A resilient structure (for example a spring: 7, figure 3) may be applied to the target object 2.