Proximity sensor for detection of electrically conductive or magnetisable object has separate setting elements providing calibration and temperature compensation for proximity sensor

摘要

The proximity sensor has an oscillation circuit containing an inductance (20) and a capacitance (30), with a resonance resistance dependent on the distance between the inductance and the detected object (40). An oscillator (60) coupled to the oscillation circuit has a first setting element (70) for providing a digitally variable feedback current, a second setting element (110) for temperature-dependent adjustment of a comparison threshold and a third setting element (200) for providing an analogue variable feedback current, the second and third setting elements coupled to the oscillation circuit. An Independent claim for a compensation and/or calibration method for a proximity sensor is also included.