Share Email Print
cover

Proceedings Paper

Evaluation of laser-based alignment algorithms under additive random and diffraction noise
Author(s): Wilbert A. McClay; Abdul Ahad Sami Awwal; Holger E. Jones; Karl Child Wilhelmsen; Walter Ferguson; Michael McGee; Mark G. Miller
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

The purpose of the automatic alignment algorithm at the National Ignition Facility (NIF) is to determine the position of a laser beam based on the position of beam features from video images. The position information obtained is used to command motors and attenuators to adjust the beam lines to the desired position, which facilitates the alignment of all 192 beams. One of the goals of the algorithm development effort is to ascertain the performance, reliability, and uncertainty of the position measurement. This paper describes a method of evaluating the performance of algorithms using Monte Carlo simulation. In particular we show the application of this technique to the LM1_LM3 algorithm, which determines the position of a series of two beam light sources. The performance of the algorithm was evaluated for an ensemble of over 900 simulated images with varying image intensities and noise counts, as well as varying diffraction noise amplitude and frequency. The performance of the algorithm on the image data set had a tolerance well beneath the 0.5-pixel system requirement.

Paper Details

Date Published: 4 November 2004
PDF: 6 pages
Proc. SPIE 5556, Photonic Devices and Algorithms for Computing VI, (4 November 2004); doi: 10.1117/12.563804
Show Author Affiliations
Wilbert A. McClay, Lawrence Livermore National Lab. (United States)
Abdul Ahad Sami Awwal, Lawrence Livermore National Lab. (United States)
Holger E. Jones, Lawrence Livermore National Lab. (United States)
Karl Child Wilhelmsen, Lawrence Livermore National Lab. (United States)
Walter Ferguson, Lawrence Livermore National Lab. (United States)
Michael McGee, Univ. of the Pacific (United States)
Mark G. Miller, 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)

© SPIE. Terms of Use
Back to Top