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 A big nano boost for solar cells
18.01.2017 | Kyoto University and Osaka Gas effort doubles current efficiencies

nachricht Multiregional brain on a chip
16.01.2017 | Harvard John A. Paulson School of Engineering and Applied Sciences

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: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

Im Focus: How to inflate a hardened concrete shell with a weight of 80 t

At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).

Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

Nothing will happen without batteries making it happen!

05.01.2017 | Event News

 
Latest News

A big nano boost for solar cells

18.01.2017 | Power and Electrical Engineering

Glass's off-kilter harmonies

18.01.2017 | Materials Sciences

Toward a 'smart' patch that automatically delivers insulin when needed

18.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>