Virtual Imaging of Interconnect Stress Test Coupon Failures
Bibliographic record
Abstract
ABSTRACT This paper reports on the use and limitations of thermal imaging and 3D X-ray techniques to determine the locations and types of failures in coupons used in Interconnect Stress Testing. A voltage is periodically applied to the PCB coupons containing microvias and buried vias to cycle them to approximately 190°C for 1000 cycles, or until they experience a 10% increase in resistance. This resistance increase is due to the microvias and buried vias experiencing stresses that create knee cracks, possible pad separations, or other failure modes. The slope of the graph of the resistance increase over time gives some indication of the type of failure, but it is impossible to verify or locate these without viewing the internal structure of the IST coupon. The use of 3D X-ray tomography and thermal imaging is investigated here as techniques to map the internal structure of the coupon, in order to locate and identify failure sites.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".