Yield improvement in SMT production by integrated process monitoring and testing

Feldmann, Klaus; Sturm, J.

doi:10.1109/iemt.1993.398198

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…Today x-ray inspection of Printed Circuit Boards (PCB) enables accurate online monitoring of several quality criterions [ 1,2]. In contrast to visual inspection x-ray images provide full 3D-information for example of solder joints.…”

Section: Introductionmentioning

confidence: 99%

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X-ray inspection of solder joints by planar computer tomography (PCT)

Neubauer

Schröpfer

Hanke

1994

Proceedings of 16th IEEE/CPMT International Electronic Manufacturing Technology Symposium

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A new algorithm for 3D-reconstruction of objects from x-ray projections, called Planar Computer Tomography (PCT), is applied to inspection of solder joints. In contrast to axial computer tomography reconstruction is based on linear object movements instead of axial rotation. By this the handling of the Printed Circuit Board is simplified and integration into the conventional x-ray inspection process is enabled. Since the algorithm is well suited for parallel computers and only a few projections are necessary a significant speed up will be achieved compared with axial Computer Tomography (CT) Computational complexity of CT is another limiting factor for application in electronic production. This problem is tackled by a reduction of the number of projections, by integration of model based knowledge and by using highly parallel computers. In the following main aspects of the new reconstruction algorithm are summarized: -Reconstruction is resticted to small volumes in suspect areas of interest (A01) Multiresolution image processing Integration of model based knowledge Algebraic Reconstruction Technique (ART) --and other 3D inspection techniques.

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Section: Introductionmentioning

confidence: 99%

“…1). The importance of x-ray inspection for inline testing is discussed in detail in [2] for example.…”

Section: Introductionmentioning

confidence: 99%