Contact-free thickness measurement with laser triangulation reduces overheads and costs

The new CALIX not only measures shiny metals for example, it can also measure the thickness of matt black rubber.

Max Mandt-Merck of the LAP Laser measuring systems sales division is thrilled about the latest CALIX generation: "We have succeeded in producing an even more rugged package incorporating outstanding product features such as contact-free measurement and universal material and temperature compatibility. The CALIX is the only system available on the market that combines temperature stability with mechanical isolation to achieve drift-free measurement. What's more, this has even been possible with an increased C-arm opening width of 200 millimetres, which is twice its previous size."


Important: you can make significant savings by using CALIX during production: 

  • Higher accuracy helps save resources and reduces consumption of expensive raw materials
  • Practical maintenance-free technology!
  • No elaborate radiation protection measures required
  • Dispenses with error-prone manual measurements for good

CALIX requires little effort to install which is another good reason to use it! The laser measuring system has a light compact construction and is therefore ideal for replacing radiometric and x-ray based measurement systems quickly, as part of modernisation measures for example.

CALIX is more accurate than radiometric systems
CALIX sensors by LAP can easily match, and often surpass, the precision of radiometric systems used in rolling mills and elsewhere. The new systems are so compact that they can be integrated into existing rolling systems with no conversion required. They also eliminate the cost and effort that was previously required to protect against radiation.

In contrast to radiometric and x-ray measuring systems, the characteristics of the material being measured do not affect operation of the LAP systems. They do not require inline calibration on a regular basis and only occasionally require maintenance.

The CALIX system measures the thickness of the continuously running strip inline to a ± 1 µm degree of precision. The measured values are displayed numerically and graphically and the system provides feedback as soon as the tolerances are exceeded.

Material-independent and temperature-stable measurement
LAP uses an optical measuring process with CALIX which works independently of the material being measured: this means that the characteristics of the material do not need to be modified to suit the measuring system – as is the case for example with radiometric thickness measurement that requires frequent online calibration. This dispenses with the need for highly trained calibration experts, when using different qualities of steel for example. The laborious process of updating the material properties in tables is therefore not required which excludes from the outset the possibility of material properties being entered incorrectly.

As the measurement is not influenced by the material properties, hidden material-related propagation of errors due to inhomogeneity of the strip material is not possible. The system also eliminates the „thickness noise“ of radiometric systems, or source noise which is known to occur in isotope systems.

Whereas up till now optical thickness measurement required elaborate temperature compensation or frequent calibration, CALIX now delivers a measurement accuracy that is free of measurable drift even where ambient temperature fluctuations are present. As a result CALIX does not need to be calibrated regularly at its place of use when in service. Furthermore, there is no longer any need for the semi-automatic calibration procedure which is necessary with other optical systems during which production is halted and a reference strip is moved by an arm into the path of the beam. What's more, CALIX can operate for long periods without requiring maintenance.

The system can be extended with little effort when working at the production line, and can also easily traverse the entire width of the strip.

More rugged than ever – overview of the most important product features of the CALIX 

  • Contact-free thickness measurement
  • Independence of material and temperature
  • Inner frame with thermally and mechanically isolated mounting
  • More than twice the previous width of the C-arm opening (now 200 millimetres)
  • Rugged construction – both inside and out
  • Drift-free components

"As an overall package, these product features ensure maximum precision and stability of measured values" sales engineer Mandt-Merck observed.

Here's how CALIX works – the technical principle
CALIX performs absolute measurements according to the laser triangulation principle; the thickness of the strip is calculated by determining the difference between two laser distance measurements which means the type of material being measured is irrelevant.

LAP achieves this high degree of precision using a specially developed arrangement of several CCD line scan cameras. Using this measuring principle, the accuracy can be kept constant throughout the entire range of measurement which also does not need to be changed when measurement is in progress. Digital signal processors adapt the analysis to the surface structure of the strip which means that CALIX does not handle matt surfaces differently to shiny surfaces when performing the measurements. No laser protection officer is required due to the low output of the laser of 1 mW (laser class 2). CALIX also completely eliminates the need for additional expenditure to protect against ionising radiation.

Your Press Contact

    Thomas Armbruster

    Tel.: +49 (0)4131 951195
    Fax: +49 (0)4131 951196

    LAP GmbH
    Laser Applikationen
    Zeppelinstr. 23
    21337 Lüneburg

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