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Title: Circular format zig-zag scanning of vidicon tubes

Abstract

In an effort to increase camera readout speed, we have developed a nonconventional vidicon tube scanning technique. Because all vidicon targets are round, acquiring a full view requires overscanning with a conventional square format scan, resulting in 22% of the video field time wasted. Furthermore, conventional scanning employs horizontal flyback, which for high frame rates can be more than 10% of the total field time. Our nonconventional scanning technique eliminates flyback time by utilizing a triangular waveform rather than a sawtooth for horizontal deflection. This triangle wave is amplitude modulated in order to scan only the (circular) area of interest. The vertical deflection is a staircase ramp, with a step occurring at the end of each horizontal line. This maintains even spacing and a parallel relationship between horizontal lines, as opposed to skewed lines with conventional scans. To display the video ouput, the X-Y monitor must also be driven with these waveforms in order to maintain the correct temporal and spatial position of the video data. Sweep rates of 400 lines in a 1 ms field have been demonstrated. Test results using this technique show a frame time reduction of {approximately}30%, with no loss of resolution or dynamic range, andmore » no increased video bandwidth requirements. 7 figs.« less

Authors:
;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
5516422
Report Number(s):
LA-UR-91-2129; CONF-9107115-20
ON: DE91016084
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Society of Photo-Optical Instrumentation Engineers (SPIE) meeting, San Diego, CA (United States), 21-26 Jul 1991
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; VIDICONS; PERFORMANCE TESTING; CIRCULAR CONFIGURATION; DESIGN; ELECTRONIC CIRCUITS; IMAGE SCANNERS; IMAGES; WAVE FORMS; CAMERA TUBES; CONFIGURATION; IMAGE TUBES; TESTING; 420200* - Engineering- Facilities, Equipment, & Techniques; 426000 - Engineering- Components, Electron Devices & Circuits- (1990-)

Citation Formats

Peterson, C G, and Simmons, C M. Circular format zig-zag scanning of vidicon tubes. United States: N. p., 1991. Web.
Peterson, C G, & Simmons, C M. Circular format zig-zag scanning of vidicon tubes. United States.
Peterson, C G, and Simmons, C M. Tue . "Circular format zig-zag scanning of vidicon tubes". United States. https://www.osti.gov/servlets/purl/5516422.
@article{osti_5516422,
title = {Circular format zig-zag scanning of vidicon tubes},
author = {Peterson, C G and Simmons, C M},
abstractNote = {In an effort to increase camera readout speed, we have developed a nonconventional vidicon tube scanning technique. Because all vidicon targets are round, acquiring a full view requires overscanning with a conventional square format scan, resulting in 22% of the video field time wasted. Furthermore, conventional scanning employs horizontal flyback, which for high frame rates can be more than 10% of the total field time. Our nonconventional scanning technique eliminates flyback time by utilizing a triangular waveform rather than a sawtooth for horizontal deflection. This triangle wave is amplitude modulated in order to scan only the (circular) area of interest. The vertical deflection is a staircase ramp, with a step occurring at the end of each horizontal line. This maintains even spacing and a parallel relationship between horizontal lines, as opposed to skewed lines with conventional scans. To display the video ouput, the X-Y monitor must also be driven with these waveforms in order to maintain the correct temporal and spatial position of the video data. Sweep rates of 400 lines in a 1 ms field have been demonstrated. Test results using this technique show a frame time reduction of {approximately}30%, with no loss of resolution or dynamic range, and no increased video bandwidth requirements. 7 figs.},
doi = {},
url = {https://www.osti.gov/biblio/5516422}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}

Conference:
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