Actions for Advanced High-Speed Framing Camera Development for Fast, Visible Imaging Experiments [electronic resource].

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Advanced High-Speed Framing Camera Development for Fast, Visible Imaging Experiments [electronic resource].

Published
Washington, D.C. : United States. National Nuclear Security Administration, 2011.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators
United States. National Nuclear Security Administration and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The advances in high-voltage switching developed in this project allow a camera user to rapidly vary the number of output frames from 1 to 25. A high-voltage, variable-amplitude pulse train shifts the deflection location to the new frame location during the interlude between frames, making multiple frame counts and locations possible. The final deflection circuit deflects to five different frame positions per axis, including the center position, making for a total of 25 frames. To create the preset voltages, electronically adjustable ±500 V power supplies were chosen. Digital-to-analog converters provide digital control of the supplies. The power supplies are clamped to ±400 V so as not to exceed the voltage ratings of the transistors. A field-programmable gated array (FPGA) receives the trigger signal and calculates the combination of plate voltages for each frame. The interframe time and number of frames are specified by the user, but are limited by the camera electronics. The variable-frame circuit shifts the plate voltages of the first frame to those of the second frame during the user-specified interframe time. Designed around an electrostatic image tube, a framing camera images the light present during each frame (at the photocathode) onto the tube’s phosphor. The phosphor persistence allows the camera to display multiple frames on the phosphor at one time. During this persistence, a CCD camera is triggered and the analog image is collected digitally. The tube functions by converting photons to electrons at the negatively charged photocathode. The electrons move quickly toward the more positive charge of the phosphor. Two sets of deflection plates skew the electron’s path in horizontal and vertical (x axis and y axis, respectively) directions. Hence, each frame’s electrons bombard the phosphor surface at a controlled location defined by the voltages on the deflection plates. To prevent the phosphor from being exposed between frames, the image tube is gated off between exposures.
Report Numbers
E 1.99:doe/nv/25946--1225
doe/nv/25946--1225
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Note
Published through SciTech Connect.
05/11/2011.
"doe/nv/25946--1225"
NNSA Laboratory Directed Research and Development Symposium, Washington DC, June 2011.
Amy Lewis, Stuart Baker, Brian Cox, Abel.
Nevada Test Site/National Security Technologies, LLC (United States)
Funding Information
DE-AC52-06NA25946
View MARC record | catkey: 14398873