Branch topics LASER World of PHOTONICS World of Photonics Congress LASER World of PHOTONICS CHINA LASER World of PHOTONICS INDIA
HOME
INDUSTRY TOPICS
BUSINESS LIFE
Search in...
 EVENT SCHEDULE 
go
full text search
in/at
in/at
 only Highlights
on/at
from - to
 - 
 CONFERENCE PROGRAM 
go
Keyword
Search by topics
Search by conferences
 
:-) my.world-of-photonics.net
Username 
Password 
Password forgotten? 
Register now!
i All about my.world-of-photonics.net






Mercateo - der Megahändler für Geschäftskunden im Internet

print page recommend page  |   Deutsch
EVENTS
bayern photonics e.V. - Kommunikationsforum
Measuring and controlling high dynamic laser welding processes with Cellular Neural Networks

As the use of laser welding processes increases in production, visual, random inspection processes increasingly have to be replaced by 100% quality control. To implement real process control, the parameters for high dynamic processes, such as laser welding, have to be recorded and evaluated in real-time. This is accomplished by an innovative camera technology: optical Cellular Neural Networks (CNN). ((teaser finish))

In laser welding processes the material to be welded is evaporated by the high intensity of the concentrated laser beam. This high dynamic process often causes seam faults. Many of these seam faults can be dealt with by changing process parameters, such as the feed rate, laser output, or the focus.

For 100% quality control of laser-based welding processes in the long term a process control system is unavoidable. Because of the complex high dynamic processes a control system such as this must be based on very fast optical image processing. The required speed is several kilohertz. This is not possible with conventional image processing. For this reason, work is being carried out on an innovative camera architecture in which the intensity values of neighboring pixels are coupled into so-called "Cellular Neural/Nonlinear Networks" (CNN). Through intelligent neural networking CNN camera systems achieve a massive data reduction and thus enable image processing in the multi-kilohertz range.

For this purpose calculation and storage elements are integrated into the electronic circuits of the pixels. This enables fast, pixel-parallel image processing. Shifting image processing steps to the camera chip enables up to 10,000 images per second to be recorded and evaluated. To monitor the welding process the camera is integrated coaxially into the processing optics of the welding robot via a beam splitter. This allows the interaction zone to be observed from the top. "Complete penetration" has become established as a quality feature for the strength of the welded seam—this is suitable as a measure for inadequate and also too strong penetration. Initial results show that for this criterion images with an image rate of 10 kHz can be evaluated and corresponding control signals can be generated. This technology has been available only since the end of 2007 and, for the first time, enables laser welding processes to be controlled on the basis of quality features.

The new measuring system is a development by Fraunhofer IPM, Frankfurt University, and the Stuttgart-based Research Association for Laser Tools (FGSW). Based on the measurements of the welding process from the diagnostics center of the Research Association for Laser Tools (FGSW) and the CNN expertise of the Fraunhofer IPM and Frankfurt University a process control system for laser welding processes is to be developed and tested within the scope of this project. The project will be funded by Landesstiftung Baden-Württemberg.


TECHNOLOGY
Max-Born-Instituts (MBI)
Monster waves of light go
OSRAM Opto Semiconductors B1.462
Efficiency record for warm white - peak values right on the Planckian curve go
University of Bristol
Scientists demonstrate all-fibre quantum logic go
MARKET-TRENDS
hide articles  hide articles 
Photonik Kongress 2014
Photonics drives innovation go
Strategies Unlimited
Recovery and new opportunities spur 9% growth in laser market go
ElectroniCast Consultants
High brightness light emitting diodes - Global Market Forecast & Analysis go
IMS Research
PV installations and module shipments up in 2009 go
According to iSuppli
First Solar to produce twice as much as leading crystalline solar module suppliers in 2009 go
In-Stat
Market for embedded picoprojector modules to exceed $1 Billion go
GTM Research
Photovoltaics through 2012 - the anatomy of a shakeout go
laser and electric arc
Lasers for macro processing go
Helmholtz Centre in Berlin
Organic solar cells make manufacturing processes cheaper go
Optech Consulting
Display technology: bright sports for German companies go
IMS Research - inverter market
Solar inverter market to grow by 40% in 2008 go
Forecast SPECTARIS
Optical, medical and mechatronic industry on course for solid growth go
Guest article from Dr. Rüdiger Paschotta, RP Photonics Consulting
Beam, disk or fiber - which type of laser will come out on top? go
"The sky is the only limit"
€ 5.5 Billion in Sales - a Record Year for the German Photovoltaic Industry go
Fiber-to-the-Home to further expand its reach in Asia-Pacific
Fiber-to-the-Home to further expand its reach in Asia-Pacific go
MMI/ks
Strategies Unlimited - image sensor market passes $6 Billion but the market shares are shifting go
MMI/ks
Solar Cell Production: Higher Performance, Lower Costs go
MMI/ks
360 Million Euros Funding for Organic Photovoltaics go
MMI/ks
US lags global VoIP market go
MMI/ks
Growth in the Photonics Sector in Figures go
MMI/ks
The Century of Light has Already Started go
NEWS FROM THE TRADE SHOWS AND CONGRESS
more articles ( 9 )  more articles ( 9 ) 
40 Jahrfeier in München
LASER World of PHOTONICS 2013 provides photonic industry with upswing go
Messe München
Supporting program for the LASER World of PHOTONICS 2013 go
LASER World of PHOTONICS
Laser technologies drive mobility and energy generation forward go
PRODUCT INNOVATIONS
more articles ( 61 )  more articles ( 61 ) 
Osram
'Luminous glass panels' - industry-mature, transparent OLEDs for the first time go
Rofin-Baasel
New versatile desktop laser marker go
Laser 2000
30 Watt optical power and wavelength measurement head for high power laser diodes go
WHO'S MOVED
Toptica Photonics
Wilhelm Kaenders elected into OSA Board go
PHOTONICS INTERVIEW
Klaus Dittrich, Managing Director of Messe München GmbH
Interview about Laser World of Photonics 2009 go
EVENTS
more articles ( 7 )  more articles ( 7 ) 
AKL’08 in Aachen on May 7 thru 9, 2008
Firework display of innovation at the International Laser Technology Congress AKL’08 go
MMI/ks
5th LANE 2007– International Conference on Applied Laser Technology go
MMI/ks
Optical Parametric Oscillators - Workshop in Berlin go
CAREER & JOBS
MMI/ks
Call for Papers go


 News - 17.04.2014
 back    top