High precision profile measurement system for easy monitoring of wire and cable contours


Measurement head GEOKON VA 4S for characterization of profiled wire and cable. The GEOKON VA 4S is suitable for in-line as well as off-line measurement. Almost all profile shapes in non-transparent materials, such as metals, plastics and rubber, can be measured.

Principle of measurement / functional description


The basic principle of the non-contact measurement system GEOKON is the light sectioning or laser triangulation technique.


A laser line is generated by a modulated laser diode and line optics and then projected onto the surface of the measurement sample. This results in specular and diffuse reflection from the surface. The diffusely reflected light is then imaged onto a matrix camera which is positioned at an angle to the illumination.


A flat surface results in a straight line in the camera; differences in height result in a shift or deflection of the laser line.


Each measurement head consists of four such light-sectioning sensors. The respective height profiles (laser lines) of the four sensors are transformed in a coordinate system in the control computer. Then the various dimensions, such as angle, radii and distance are determined and, in parallel, the entire contour of the measurement object is compared to the upper and lower tolerance profiles.


If the tolerance limits are exceeded, a signal is output and the result is displayed in a different colour. Two action control limits are generally defined.


With the “Teach-In” program, new profile types can be defined very simply. The technical drawing must be saved in DXF-format and entered into the “Teach-In” program. Then the measurement parameters are defined, as in CAD programs, by entering dimensions, creating a name (e.g., R15), defining tolerance or intervention levels and saving the parameters. To start a new measurement program, only the article to be measured must be selected.

Points of intersection or the origin of an arc, etc., can also be measured. The “Teach-In” program can, of course, be installed on other computers besides the system computer. The measurement definition can then be transferred via the network or by data medium to the system computer.




The results are displayed numerically as well as graphically. An exclusively numerical display of important dimensions in large numbers can be selected.

Besides dimensions along the surface of the contour, virtual dimensions, e.g., the distance of the intersection of two lines to origin of a circle or between two circle origins, etc., can be evaluated and displayed.

A time course display of the of the individual measurement values is also available.

Measurement results are saved and transferred to the existing PDA- or SPC-systems, or simply archived in the network, according to customer requirements.