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Inspection of large solder joints (LASOL)

Objective



Objectives and content:
The ÛLASOLÚ project comprises the development evaluation and appraisal of a novel automated inspection system specifically designed for large area solder joints, i. e. joints with a surface area greater than 2mm. Current inspection systems are usually optimized for very small joints (e.g. surface mount), based on grayscale imaging. These systems can check for the existence of a joint, but information on its condition or quality is inadequate. The LASOL system will utilize a non-destructive method based on the light sectional principle to optically inspect the joint surface in 3 dimensions. With this method, the LASOL team intends to achieve:
- Establishment of generic relations between geometric structures and quality functions, as fluid and gas tightness or mechanical strength;
- 100% testing of industrial production batches;
Definition of generic rules for process control using geometric measurement data;
- Set-up and validation of an industrial strength pre-competitive prototype for automated inspection of Large Solder Joints.

LASOL started in September 1998. In the first 18-month period the LASOL team intends to develop a preliminary measurement set-up to take a large number of samples of real product data. New or adapted filtering and fusion algorithms will be developed to pre-process these data. Geometric information thus generated will be evaluated statistically to establish relations between geometric surface features and quality functions. In the second 18-month period a prototype inspection system will be set-up using novel projection and camera technologies for data acquisition. Inspection software involving newly developed filtering, fusion and statistical evaluation software will be integrated into the LASOL inspection system. Generic rules and standards for LSJ inspection will be gained from operating experience with the LASOL inspection system. These data will serve to establish relations between geometric data and control parameters of the soldering process, which are needed to improve soldering quality. BE97-4689

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

AEG Kondensatoren und Wandler Gmbh
Address
Sickingenstrasse
12163 Berlin
Germany

Participants (6)

FER Gesellschaft für Industrielle Bildverarbeitung mgH
Germany
Address
Stendaler Strasse
39106 Magdeburg
FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Germany
Address
Sandtorstrasse 22
39106 Magdeburg
INSTITUTO DE DESENVOLVIMENTO DE NOVAS TECNOLOGIAS
Portugal
Address
Quinta Da Torre
2825-114 Monte Da Caparica
JENOPTIK Laser Optik Systeme GmbH.
Germany
Address
Göschwitzer Strasse
07739 Jena
National University of Ireland, Cork
Ireland
Address
Prospect Row
30 Cork
TEKELEC Componentes e Equipamentos Lda
Portugal
Address
Ch€o De Murches
2750 Casacais