Precitec Gmbh

Precitec Kg

Georg Sp&ouml;rl

Stephan Biermann

J&uuml;rgen Walz

An inductive measurement is carried out of the distance between a workpiece ( ) and a working head ( ), which bears an induction coil ( ), through which an alternating current flows and which is part of a resonance circuit whose oscillation frequency is monitored for changes which occur as a consequence of changes in the distance between the workpiece ( ) and working head ( ). In this case, the working head ( ) acts on the workpiece ( ) with a material ( ) having a dielectric constant greater than 1. The frequency of the alternating current is in the megahertz region or just therebelow. Last but not least, the induction coil is screened from external electric fields in order to avoid the influence of parasitic capacitances.

Method for inductive distance measurement, and a working head for carrying out this method using an induction coil

The invention relates to a method and a device for measuring the distance between a sensor electrode and a workpiece. The sensor electrode forms, with the workpiece, a measuring capacitor through which an alternating current flows. A voltage present at the sensor electrode is tapped as a measuring voltage. In order to be able to remove the disturbing influence on the impedance of the measuring capacitor of a plasma forming between the sensor electrode and workpiece, the real part and the imaginary part from the measuring voltage are analyzed and used to determine the distance between the sensor electrode and the workpiece.

Method for measuring the distance between a sensor electrode and a workpiece

The invention relates to a method for temperature compensation of an LC oscillator ( ) having a machining head ( ) and serving for the capacitive measurement of a distance between the machining head ( ) and a workpiece ( ), in which an output signal (S) of the LC oscillator ( ) is transmitted to an evaluation unit ( ) arranged separately from the machining head ( ). The temperature (T) of the LC oscillator ( ) is measured with the aid of the temperature sensor ( ) and supplied to the evaluation unit ( ). In the evaluation unit ( ), temperature compensation of the output signal (S) of the LC oscillator ( ) is effected using the measured temperature (T) and a temperature coefficient (K) which is assigned to the machining head ( ) and can likewise be transmitted from the machining head ( ) to the evaluation unit ( ).

Growing community of inventors

Rheinstetten, Germany

Georg Spörl

Growing community of inventors

Rheinstetten, Germany

Georg Sp&ouml;rl

Georg Spörl