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Proceedings Paper

Optimization and improvement of FOA corner cube algorithm
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Paper Abstract

Alignment of laser beams based on video images is a crucial task necessary to automate operation of the 192 beams at the National Ignition Facility (NIF). The final optics assembly (FOA) is the optical element that aligns the beam into the target chamber. This work presents an algorithm for determining the position of a corner cube alignment image in the final optics assembly. The improved algorithm was compared to the existing FOA algorithm on 900 noise-simulated images. While the existing FOA algorithm based on correlation with a synthetic template has a radial standard deviation of 1 pixel, the new algorithm based on classical matched filtering (CMF) and polynomial fit to the correlation peak improves the radial standard deviation performance to less than 0.3 pixels. In the new algorithm the templates are designed from real data stored during a year of actual operation.

Paper Details

Date Published: 4 November 2004
PDF: 6 pages
Proc. SPIE 5556, Photonic Devices and Algorithms for Computing VI, (4 November 2004); doi: 10.1117/12.562186
Show Author Affiliations
Wilbert A. McClay, Lawrence Livermore National Lab. (United States)
Abdul Ahad Sami Awwal, Lawrence Livermore National Lab. (United States)
Scott C. Burkhart, Lawrence Livermore National Lab. (United States)
James V. Candy, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 5556:
Photonic Devices and Algorithms for Computing VI
Khan M. Iftekharuddin; Abdul Ahad S. Awwal, Editor(s)

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