Measuring Principle

The chromatic coded principal utilises the chromatic length aberration of specialized lens to measure distance and thickness.  Due to the independence of surface properties all materials can be measured by the sensor.  The coaxial set-up enables measurement on structures with high aspect ratio in spite of shading.

Chromatic Coded Princple
The measurement range of the sensor stretches from µm to mm with corresponding resolution.	Download: Chromatic Measurement Principle
Typical applications of the sensor are stand-alone topographic measurement systems or integraged into online production processes.  The optical probe is connected via an optical fiber to the control unit.    This ensures non-interference of the operating system in problematic or hazardous environments such as strong electromagnetic fields, vacuum, radioactivity or explosive areas.
White Light Interferometer
Beside the chromatic coded principle the sensor also works as a white light interferometer. It is possible to measure transparent film thickness between 2 µm and 250 µm and optical thickness of single and multiple layers, i.e., varnish or adhesive foils.
	Download: Interferometric Thickness Operating Principle