Measuring with light

Chromatic coded priciple

The chromatic coded principal utilises the chromatic length aberration of specialized lens to measure distance and thickness. Due to the independence of surface properties merely all materials can be measured by the sensor. The coaxial set-up enables measurement on structures with high aspect ratio in spite of shading. The measurement range of the sensor stretches from some micrometers up to millimeters with corresponding resolution. Typical applications of the sensor are topographic measurement systems as well as inline use. The passive sensor probe (Link: Optical Probes) is connected via an optical fiber with the control unit to ensure the operation in problematic or hazardous environment 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 optical thickness of single and multiple layers like functional coatings, varnish or adhesive foil.

For further information:

• Publication (Photonik 2000)

<< Back