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Micro-Computed Tomography Measurements in Electronics



Electronic components may be subjected to significant deformation under the action of thermal and mechanical loads during operation and storage.  The use of thin material layers in addition to fine embedded interconnects limits the possibilities for the integration of sensors to measure deformation and strain.  Previously, deformations in in electronic components and assemblies have been measured using optical methods including moiré interferometry and digital image correlation – both of which require the cross-sectioning of the solder joint to gain access to the joint of interest for the purpose of strain and deformation measurement.  Cross-sectioning is an invasive technique which requires discarding a portion of the package.  In addition, the measurements are often limited to line of sight allowing measurement of only the optically visible cut-section.  In this research area, methods are being studied for non-contact measurement of displacements in electronics layers and interconnects, non-invasively using a combination of x-ray computed tomography and digital volume correlation.  The new class-of-methods does not require cross-sectioning of the part for the purpose of deformation and strain measurement.  In addition, the measurements are not limited to the joints in the line of sight.

Representative Publications

  1. Lall, P., Wei, J., Remaining Useful Life Assessment of Field Deployed Electronics Using X-ray Micro-CT Based Digital Volume Correlation and Finite- Element Analysis, Proceedings of the 66th ECTC, Las Vegas, Nevada, pp. 1583- 1593, May 31- June 3, 2016.
  2. Lall, P., Wei, J., PBGA Package Finite Element Analysis Based on the Physical Geometry Modeling Using X-ray Micro-CT Digital Volume Reconstruction, Proceedings of the ITHERM 2016, Las Vegas, Nevada, pp. 285- 295, May 31- June 3, 2016.
  3. Lall, P., and J. Wei, X-Ray Micro- CT and Digital- Volume Correlation Based Three- Dimensional Measurements of Deformation and Strain in Operational Electronics, Proceedings of the 65th ECTC, San Diego, CA, pp. 406-416, May 26-29, 2015
  4. Lall, P., Deshpande, S., Wei, J., Suhling, J., Non-Destructive Crack and Defect Detection in SAC Solder Interconnects Using Cross-Sectioning and X-Ray Micro-CT, Electronic Components and Technology Conference, 64th ECTC, pp. 1449-1456, Orlando, FL, May 27-30, 2014.

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