LAP has further enhanced the accuracy of its CALIX sensors in strip gage measuring applications. The systems now reach the same or even superior levels of precision as radiometric systems, which so far have been the most commonly used systems in rolling mills. Thanks to their compactness, the new systems can be easily integrated into existing process lines, without having to take any conversion measures on site. Their operation does not require any radiation protection measures to be taken.
LAP has developed a new generation of laser-based thickness gages, representing a cost-effective alternative to radiometric systems. Comprehensive measurements have shown that the new CALIX sensors operate with a measuring accuracy of +/- 4 µm and a repetition accuracy of +/- 0.4 µm (2 Ã) over the complete measurement range of 0.02 – 30 mm.
CALIX systems work entirely independently of the strip properties. Therefore it is not necessary to input any chemistry and density data for the strip or store such information in a database, as required by radiometric methods. This feature prevents any hidden, material-inherent error propagation due to material inhomogeneities in the strip material. “Thickness noise” known from radiometric systems or the source noise occurring with isotopic systems are things of the past.
The high level of measuring accuracy and the compact design make CALIX systems a highly attractive alternative to radiometric systems when building completely new or upgrading existing rolling mills. Due to the moderate expense of the optics and evaluation electronics and the low calibration and maintenance effort, CALIX is a highly cost-effective solution.
As the measuring frame is extremely compact – the system requires a maximum clearance of 400 mm in the rolling direction – existing radiometric systems can be replaced without rebuilding the mill equipment. Existing devices for retracting the frame can be continued to be used.
There is up to 200 mm clearance between the legs of the C-frame, avoiding any risk of collision when measuring wavy material or during strip threading. From now on LAP will deliver the CALIX systems with leg lengths of 1,000 mm. A measuring frame can accommodate several pairs of sensors for different measuring tracks. As an alternative option, it is also possible to use a measuring frame equipped with only one pair of sensors and traverse it across the width of the strip.