Detection of Off-normal Images for NIF Automatic Alignment

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One of the major purposes of National Ignition Facility at Lawrence Livermore National Laboratory is to accurately focus 192 high energy laser beams on a nanoscale (mm) fusion target at the precise location and time. The automatic alignment system developed for NIF is used to align the beams in order to achieve the required focusing effect. However, if a distorted image is inadvertently created by a faulty camera shutter or some other opto-mechanical malfunction, the resulting image termed ''off-normal'' must be detected and rejected before further alignment processing occurs. Thus the off-normal processor acts as a preprocessor to automatic alignment ... continued below

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Candy, J V; Awwal, A S; McClay, W A; Ferguson, S W & Burkhart, S C July 11, 2005.

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One of the major purposes of National Ignition Facility at Lawrence Livermore National Laboratory is to accurately focus 192 high energy laser beams on a nanoscale (mm) fusion target at the precise location and time. The automatic alignment system developed for NIF is used to align the beams in order to achieve the required focusing effect. However, if a distorted image is inadvertently created by a faulty camera shutter or some other opto-mechanical malfunction, the resulting image termed ''off-normal'' must be detected and rejected before further alignment processing occurs. Thus the off-normal processor acts as a preprocessor to automatic alignment image processing. In this work, we discuss the development of an ''off-normal'' pre-processor capable of rapidly detecting the off-normal images and performing the rejection. Wide variety of off-normal images for each loop is used to develop the criterion for rejections accurately.

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PDF-file: 14 pages; size: 0.5 Mbytes

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  • Presented at: SPIE Optics & Photonics 2005, San Diego, CA, United States, Jul 31 - Aug 04, 2005

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  • Report No.: UCRL-CONF-213620
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 878638
  • Archival Resource Key: ark:/67531/metadc874958

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Office of Scientific & Technical Information Technical Reports

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  • July 11, 2005

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 5, 2016, 1:57 p.m.

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Candy, J V; Awwal, A S; McClay, W A; Ferguson, S W & Burkhart, S C. Detection of Off-normal Images for NIF Automatic Alignment, article, July 11, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc874958/: accessed May 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.