Deep learning for evaluating difficult-to-detect incomplete repairs of high fluence laser optics at the National Ignition Facility

T. Nathan Mundhenk; Laura M. Kegelmeyer; Scott K. Trummer

doi:10.1117/12.2264000

14 May 2017 Deep learning for evaluating difficult-to-detect incomplete repairs of high fluence laser optics at the National Ignition Facility

T. Nathan Mundhenk, Laura M. Kegelmeyer, Scott K. Trummer

Author Affiliations +

Proceedings Volume 10338, Thirteenth International Conference on Quality Control by Artificial Vision 2017; 103380H (2017) https://doi.org/10.1117/12.2264000
Event: The International Conference on Quality Control by Artificial Vision 2017, 2017, Tokyo, Japan

Abstract

Two machine-learning methods were evaluated to help automate the quality control process for mitigating damage sites on laser optics. The mitigation is a cone-like structure etched into locations on large optics that have been chipped by the high fluence (energy per unit area) laser light. Sometimes the repair leaves a difficult to detect remnant of the damage that needs to be addressed before the optic can be placed back on the beam line. We would like to be able to automatically detect these remnants. We try Deep Learning (convolutional neural networks using features autogenerated from large stores of labeled data, like ImageNet) and find it outperforms ensembles of decision trees (using custom-built features) in finding these subtle, rare, incomplete repairs of damage. We also implemented an unsupervised method for helping operators visualize where the network has spotted problems. This is done by projecting the credit for the result backwards onto the input image. This shows regions in an image most responsible for the networks decision. This can also be used to help understand the black box decisions the network is making and potentially improve the training process.

Citation Download Citation

T. Nathan Mundhenk, Laura M. Kegelmeyer, and Scott K. Trummer "Deep learning for evaluating difficult-to-detect incomplete repairs of high fluence laser optics at the National Ignition Facility", Proc. SPIE 10338, Thirteenth International Conference on Quality Control by Artificial Vision 2017, 103380H (14 May 2017); https://doi.org/10.1117/12.2264000

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