Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Measuring in 3-D

17.04.2008
“The lenses used in many optical components today – for instance in car headlamps, or in digital projectors or cameras – are no longer spherical, but have free-form geometries,” says Dr. Gunther Notni of the IOF.

“Free-form geometries are not rotationally symmetrical, but may be surfaces of any shape. This makes them expensive to manufacture, and the conventional methods used so far have not allowed the lenses and mirrors to be tested thoroughly enough. Until now, it has taken over an hour to measure the aspherical lenses using high-precision coordinate measuring devices.”

For Carl Zeiss Jena GmbH, this was reason enough to develop a new measuring system for the expensive lenses in a collaborative project with the Fraunhofer researchers and IVB GmbH, a small local company.

LensShape is the result of successful cooperation between research and industry in the optical technologies. Taking ‘Success Built on Cooperation – A Faster Route from Ideas to Products’ as its motto, the Fraunhofer-Gesellschaft has already set up 11 innovation clusters all over Germany. The Jena Optical Innovation cluster JOIN is one of them.

The optical 3-D scan system enabled the scientists to increase the speed significantly: The measuring process now takes a mere 15 minutes. There are other advantages, too: Since the surface is not touched by a scanner, scratches are avoided and the process can immediately be corrected with the aid of the data obtained. Notni explains the benefits of the new method: “We project fringe patterns onto the free form with a digital projector. These are recorded with a CCD camera from different directions. We then analyze the fringe bending on the computer, using a special mathematical method. Deviations from the reference values of as little as one micron can be quickly and easily identified. What makes the new method unique is that the data obtained can also be used for the subsequent grinding process, and this rounds off the correction cycle.”

It is not only the manufacturers of car headlamps and projector lenses who will soon benefit from the new test method. “While Carl Zeiss GmbH requires the version that measures up to 300 millimeters, we can also measure smaller lens systems down to less than 10 millimeters,” states Notni, explaining the potential that this new measuring method offers. Another well-known optics manufacturer is currently testing the technology with a view to measuring particularly small lens systems for tapping light from LEDs. IVB GmbH began marketing the new method several months ago.

Monika Weiner | alfa
Further information:
http://www.fraunhofer.de/EN/press/pi/2008/04/PressRelease10thApril2008.jsp

More articles from Power and Electrical Engineering:

nachricht Researchers use light to remotely control curvature of plastics
23.03.2017 | North Carolina State University

nachricht TU Graz researchers show that enzyme function inhibits battery ageing
21.03.2017 | Technische Universität Graz

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

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

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Argon is not the 'dope' for metallic hydrogen

24.03.2017 | Materials Sciences

Astronomers find unexpected, dust-obscured star formation in distant galaxy

24.03.2017 | Physics and Astronomy

Gravitational wave kicks monster black hole out of galactic core

24.03.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>