Reliability
Many of the systems have proven themselves under conditions that for a long time made the use of optical methods seemingly impossible – for example in the cold rolling of high-strength strip, where dense rolling oil mist is created. But the VTLG operates reliably even then.
We manufacture the VTLG thickness gauges with a measurement throat depth of up to 1,480 mm and a measurement resolution of 0,1 µm so that they can measure transverse thickness profiles even on wide strips.
The VTLG 101/1 has been specially designed for the cold-rolling of foils with thicknesses between 0.003 and 2.0 mm, and is the only laser measuring system available on the market that can be installed very close to the roll gap even when rolling foils. It operates with an absolute measuring precision of ± 0,5 µm.
Simple and Safe
The automatic air cleaning system for the measuring window and beam path and the innovative temperature compensation ensure the highest precision even under difficult environmental conditions.
The Technology
Thickness measurement is based on laser triangulation. On the upper and lower sides of a sturdy C-frame is a compact measuring head which both transmits the measurement beam and receives the reflected light. Both sensors measure the distance from the strip surface from their perspective. The thickness of the strip is then calculated from the measured distances and the distance between the two sensors. With an internal scanning rate of up to 80 kHz, the scalable analog output provides the input signal for the high-speed thickness control within milliseconds.
Permanently Precise
When the C-frame moves out of its parking position into the measuring position on the strip, the measuring system passes through the permanently installed adjustment station. There the system measures the inserted captive DAkkS-certified gauge blocks that represent the whole measuring range of the respective application. The VTLG calibrates itself and makes any necessary corrections automatically. This ensures that the system measures accurately at all times.
