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Precision measurement of metallic foils during production


Fraunhofer Institute for Laser Technology ILT

+49 241 8906-0

The Fraunhofer Institute for Laser Technology ILT has unveiled its new “bd-2” sensor for thickness measurements. The system can accurately measure foils, rolled strips and other metallic semi-finished products with an accuracy of at least 100nm, within a measurement range of several millimeters, according to the company.

The small sensor head coupled with high-speed data processing facilitates inline measurements in the production line, the company reports.


Measurement under rough ambient conditions. Credit: Fraunhofer ILT, Aachen.

The innovative optical thickness measurement system “bd-2” (for bidirectional measurements) was developed at Fraunhofer ILT to meet the increasingly stringent quality control requirements in certain industries, such as aerospace and automotive, according to the company.

The technology is based on the interference properties of semiconductor laser sources. A measuring beam is projected onto the material surface and the reflected signal allows the distance to be measured with a precision of 100nm. Multiple layers can be measured simultaneously in the case of semitransparent materials.

This system was developed specifically for metalworking to measure the thickness of rolled strips and metallic foils. The thickness measurement system “bd-2” comprises two sensing heads mounted in a C-frame to measure the thickness of the product passing by. “bd-2” is suited to measure the thickness of rolled strips, metallic sheets and foils in the range of 10?m to 10mm. Both matt and high-glossy surfaces can be measured.

For more information, click here.


Posted May 29, 2013.