Carl Mahr Holding Gmbh

Peter Strack

Jens Stockburger

Zoran Ostric

Christian Steiner

An elevation measuring device comprises a measuring column at which a vertically movable measuring slide is supported, so it can be moved by hand and also by a drive motor through a clutch device. The measuring slide supports a scan head, which imparts a constant measuring force onto the measuring location at the work piece, which is generated by the drive motor and the clutch device. A measuring system detects the elevation coordinate of the scan head and hands said elevation coordinate to a control device for further processing and evaluation. The control device comprises logic for automating the measuring process. This logic automatically detects a positioning of the scan head in a certain direction, which is manually performed by the operator, subsequently controls the drive motor in a suitable manner in order to cause a scanning of the work piece and determines the measurement values.

Measuring device for fast measurements

A distance measuring system ( ) is provided with a capacitive sensor ( ), designed in the form of a differential capacitor ( ), for which the partial capacitors (C , C have capacitances that depend on the position to be determined. The system also includes a processing device ( ) for determining the desired distance that contains, for example, a sigma/delta demodulator. The partial capacitors (C , C ) are triggered periodically with binary signals, wherein the trigger signals from the one partial capacitor (C ) are transmitted with a phase offset to the signals from the other partial capacitor (C ). The processing device ( ) determines which trigger signals must be used for the evaluation. Within time windows that are synchronized with the edges of the trigger signals, a switch unit ( ) allows the associated receiving signals to pass through to the processing unit ( ) and blanks out all other signals. The distance measuring system ( ) makes it possible to have a low number of interpolation errors with high resolution and long interpolation periods. The distance measuring system ( ) can be expanded by adding two essentially independent, parallel-operating relative measuring systems to form an absolute distance measuring system, which determines the absolute position solely from the current measuring values. A nearly optional enlargement of the measuring range is possible by adding further relative measuring systems.

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Chanteheux, France

Peter Strack