Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Precision measurement of metallic foils during production

08.05.2013
The Fraunhofer Institute for Laser Technology ILT is unveiling its new “bd-2” sensor for thickness measurements.

Within a measurement range of several millimeters, the system can accurately measure foils, rolled strips and other metallic semi-finished products with a precision better than 100 nm. The small sensor head coupled with high-speed data processing facilitates inline measurements in the production line.


The new “bd-2” thickness measurement system based on bidirectional sensors.
Picture Source: Fraunhofer ILT, Aachen


Measurement under rough ambient conditions.
Picture Source: Fraunhofer ILT, Aachen

Materials and quality control must meet increasingly stringent requirements in the aerospace and automotive industries. To provide thickness measurement, for instance, sensors must now be accurate down to the micrometer range yet nonetheless operate in the production line as fast as possible and with minimal maintenance.

The innovative optical thickness measurement system “bd-2” (for bidirectional measurements) was developed at Fraunhofer ILT to meet these requirements. 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 100 nm. 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 µm to 10 mm. Both matt and high-glossy surfaces can be measured reliably.

A new sensing head simplifies the entire measurement process
Compared with established methods such as laser triangulation, the new process offers several advantages: since irradiated and reflected beams are propagating along the same line, alignment efforts are eliminated as transmitter and receiver no longer have to be adjusted to each other. It also requires less space than solutions such as triangulation: the sensing head transmits and receives its measuring beam through a small window just 2 mm in diameter and is reliably protected against contamination even in the harshest environments by using an air stream. Compared with conventional triangulation sensors, the new sensor by far outperforms its rivals when it comes to linearity error.

Control processes reliably at 210 km/h

Although it offers the accuracy of interferometric methods, the new sensor “bd-2” is much faster than established distance sensors that provide absolute measurements. The complete system processes up to 70,000 distance measurements per second. As part of initial practical tests, moving objects were measured reliably at a speed of 3.5 km/min, equivalent to 210 km/h. As such, inline measurements are possible even at high production speeds, thus enabling fast feedback loops to control and optimize production processes.

Sensor sets new standards for industrial manufacturing

In terms of speed and integrability, “bd-2” sets new standards for process control and quality assurance in various industry segments.

The process paves the way for the transition from laboratory-based individual measurement to continuous inline production control. This is why the Fraunhofer ILT experts are targeting industry customers looking to meet higher accuracy requirements in series production, offering them not just complete systems but also extensive consulting in relation to process integration. The sensors were tested extensively in pilot plant operation; first industry partners will be rolling out the new technology in June 2013.

Under the slogan “inspired to measure”, the interferometric thickness sensor will be showcased at this year’s CONTROL in Stuttgart on the Fraunhofer booth 1502 in Hall 1.

Contacts

Dr. Stefan Hölters MBA
Head of the Clinical Diagnostics and Microsurgical Systems Group
Phone +49 241 8906-436
stefan.hoelters@ilt.fraunhofer.de
PD Dr. Reinhard Noll
Head of the Measurement Technology and EUV Sources Competence Area
Phone +49 241 8906-138
reinhard.noll@ilt.fraunhofer.de

Fraunhofer Institute for Laser Technology ILT
Steinbachstrasse 15
52074 Aachen, Germany
Phone +49 241 8906-0
Fax +49 241 8906-121

Petra Nolis | Fraunhofer-Institut
Further information:
http://www.ilt.fraunhofer.de

More articles from Materials Sciences:

nachricht Nanoimprinted hyperlens array: Paving the way for practical super-resolution imaging
24.04.2017 | Pohang University of Science & Technology (POSTECH)

nachricht Wonder material? Novel nanotube structure strengthens thin films for flexible electronics
24.04.2017 | University of Illinois College of Engineering

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

7th International Conference on Crystalline Silicon Photovoltaics in Freiburg on April 3-5, 2017

03.04.2017 | Event News

 
Latest News

DGIST develops 20 times faster biosensor

24.04.2017 | Physics and Astronomy

Nanoimprinted hyperlens array: Paving the way for practical super-resolution imaging

24.04.2017 | Materials Sciences

Atomic-level motion may drive bacteria's ability to evade immune system defenses

24.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>