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Proceedings Paper

Flat-Field Response And Geometric Distortion Measurements Of Optical Streak Cameras
Author(s): D. S. Montgomery; R. P. Drake; B. A. Jones; J. D. Wiedwald
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Paper Abstract

To accurately measure pulse amplitude, shape, and relative time histories of optical signals with an ontical streak camera, it is necessary to correct each recorded image for spatially-dependent gain nonuniformity and geometric distortion. Gain nonuniformities arise from sensitivity variations in the streak-tube photocathode, phosphor screen, image-intensifier tube, and image recording system. These nonuniformities may be severe, and have been observed to be on the order of 100% for some LLNL ontical streak cameras. Geometric distortion due to optical couplings, electron-optics, and sweep nonlinearity not only affects pulse position and timing measurements, but affects pulse amplitude and shape measurements as well. By using a 1.053-μm, long-pulse, high-power laser to generate a spatially and temporally uniform source as input to the streak camera, the combined effects of flat-field response and geometric distortion can be measured under the normal dynamic operation of cameras with S-1 photocathodes. Additionally, by using the same laser system to generate a train of short pulses that can be spatially modulated at the input of the streak camera, we can effectively create a two-dimensional grid of equally-spaced pulses. This allows a dynamic measurement of the geometric distortion of the streak camera. We will discuss the techniques involved in performing these calibrations, will present some of the measured results for LLNL optical streak cameras, and will discuss software methods to correct for these effects.

Paper Details

Date Published: 4 February 1988
PDF: 6 pages
Proc. SPIE 0832, High Speed Photography, Videography, and Photonics V, (4 February 1988); doi: 10.1117/12.942241
Show Author Affiliations
D. S. Montgomery, Lawrence Livermore National Laboratory (United States)
R. P. Drake, Lawrence Livermore National Laboratory (United States)
B. A. Jones, Lawrence Livermore National Laboratory (United States)
J. D. Wiedwald, Lawrence Livermore National Laboratory (United States)

Published in SPIE Proceedings Vol. 0832:
High Speed Photography, Videography, and Photonics V
Howard C. Johnson, Editor(s)

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