Shadowgraph illumination techniques for framing cameras

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Description

Many pulse power applications in use at the Pegasus facility at the Los Alamos National Laboratory require specialized imaging techniques. Due to the short event duration times, visible images are recorded by high-speed electronic framing cameras. Framing cameras provide the advantages of high speed movies of back light experiments. These high-speed framing cameras require bright illumination sources to record images with 10 ns integration times. High-power lasers offer sufficient light for back illuminating the target assemblies; however, laser speckle noise lowers the contrast in the image. Laser speckle noise also limits the effective resolution. This discussion focuses on the use ... continued below

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6 p.

Creation Information

Malone, R.M.; Flurer, R.L.; Frogget, B.C.; Sorenson, D.S.; Holmes, V.H. & Obst, A.W. December 31, 1997.

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Description

Many pulse power applications in use at the Pegasus facility at the Los Alamos National Laboratory require specialized imaging techniques. Due to the short event duration times, visible images are recorded by high-speed electronic framing cameras. Framing cameras provide the advantages of high speed movies of back light experiments. These high-speed framing cameras require bright illumination sources to record images with 10 ns integration times. High-power lasers offer sufficient light for back illuminating the target assemblies; however, laser speckle noise lowers the contrast in the image. Laser speckle noise also limits the effective resolution. This discussion focuses on the use of telescopes to collect images 50 feet away. Both light field and dark field illumination techniques are compared. By adding relay lenses between the assembly target and the telescope, a high-resolution magnified image can be recorded. For dark field illumination, these relay lenses can be used to separate the object field from the illumination laser. The illumination laser can be made to focus onto the opaque secondary of a Schmidt telescope. Thus, the telescope only collects scattered light from the target assembly. This dark field illumination eliminates the laser speckle noise and allows high-resolution images to be recorded. Using the secondary of the telescope to block the illumination laser makes dark field illumination an ideal choice for the framing camera.

Physical Description

6 p.

Notes

OSTI as DE97054129

Source

  • 11. IEEE international pulsed power conference, Baltimore, MD (United States), 29 Jun - 2 Jul 1997

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  • Other: DE97054129
  • Report No.: DOE/NV/11718--140
  • Report No.: CONF-9706113--
  • Grant Number: AC08-96NV11718
  • DOI: 10.2172/663173 | External Link
  • Office of Scientific & Technical Information Report Number: 663173
  • Archival Resource Key: ark:/67531/metadc706756

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Creation Date

  • December 31, 1997

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 29, 2016, 7:25 p.m.

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Malone, R.M.; Flurer, R.L.; Frogget, B.C.; Sorenson, D.S.; Holmes, V.H. & Obst, A.W. Shadowgraph illumination techniques for framing cameras, report, December 31, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc706756/: accessed August 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.