Inline thickness measurement of metal band with laser sensors supersedes isotope- and x-ray-systems

LAP considerably increased the accuracy of CALIX sensors for thickness measurement of band. Their accuracy reaches and in many cases exceeds the radiometric systems common in rolling mills. The dimensions of CALIX systems makes them easy to build into existing production lines with little to no effort. By using CALIX sensors, measures for radiation protection are obsolete.

LAP developed new laser thickness measuring systems as a cost-effective alternative to radiometric systems. Complex testing routines prove CALIX sensors to perform with accuracies of +/- 4 µm at a repeatability of +/- 0,4 µm (2 σ) for the whole measurement range from 0,02 to 30 mm.

CALIX systems work totally independent of material qualities. You don't need to find out, evaluate, select and handle individual values for each type of metal like required in radiometric thickness measurement. Using only dimensions instead of material properties prevents hidden errors based on inconsistent material. Even the "thickness noise" of radiometric systems or the "sourse noise" of isotope-systems are no longer existent.

High accuracy and compact dimensions make CALIX systems attractive for new constructions as well as for refurbishment. Comparatively little effort for optics, data evaluation, calibration and maintenance makes CALIX a reasonable and economic solution in purchase and in day-to-day operation.

The opening of the C-frame is up to 200 mm, eliminating the danger of collision for bumpy material and during threading. To measure in the middle of band with up to 2 metres band width, LAP now offers CALIX sensors with 1 metre fork depth. One C-frame may house several pairs of sensors to provide variable measuring tracks. Alternatively, a one-track system may traverse to collect data for the complete width of the band.

Using digital signal processors, data evaluation reacts in real-time to the surface structure of the band. This way, CALIX handles dull surfaces as well as shiny material. The output power of the laser stays below 1 mW (in laser class 2), so you don′t even need a laser safety officer. Measures for ionisating radiation safety are no longer necessary.

The first lot of CALIX sensors has been delivered and will be commissioned beginning of 2010 in the United States.

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    Thomas Armbruster

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    LAP GmbH
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    21337 Lüneburg

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