Method for measuring a coil with losses and inductive distance sensor constructed in accordance with this method

摘要

The invention relates to a method and a device for measuring the losses, present in an electrical magnetic radio-frequency field, of a coil with losses by inserting an attenuator, for example a control tab of electrically or magnetically conductive or ferromagnetic material, so that the dependence of the coil Q on temperature is no longer included in the measurement of the attenuation. For this purpose, the resistance of the field loss impedance due to this attenuation is measured independently of the winding loss resistance and independently of the reactance of the coil. The simplest possibility is measuring the active power in this field loss impedance. The use of such a measuring method is particularly advantageous in inductive proximity and distance sensors.