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Proceedings Paper

Comparison of an NVG model with experiments to elucidate temporal behaviour
Author(s): Paul J. Thomas; Robert S. Allison; Sion Jennings; Todd Macuda; James Zacher; Henok Mehbratu; Richard Hornsey
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Paper Abstract

Expected temporal effects in a night vision goggle (NVG) include the fluorescence time constant, charge depletion at high signal levels, the response time of the automatic gain control (AGC) and other internal modulations in the NVG. There is also the possibility of physical damage or other non-reversible effects in response to large transient signals. To study the temporal behaviour of an NVG, a parametric Matlab model has been created. Of particular interest in the present work was the variation of NVG gain, induced by its automatic gain control (AGC), after a short, intense pulse of light. To verify the model, the reduction of gain after a strong pulse was investigated experimentally using a simple technique. Preliminary laboratory measurements were performed using this technique. The experimental methodology is described, along with preliminary validation data.

Paper Details

Date Published: 1 May 2007
PDF: 8 pages
Proc. SPIE 6557, Head- and Helmet-Mounted Displays XII: Design and Applications, 65570T (1 May 2007); doi: 10.1117/12.719685
Show Author Affiliations
Paul J. Thomas, Topaz Technology Inc. (Canada)
Robert S. Allison, York Univ. (Canada)
Sion Jennings, National Research Council Canada, Institute for Aerospace Research (Canada)
Todd Macuda, National Research Council Canada, Institute for Aerospace Research (Canada)
James Zacher, York Univ. (Canada)
Henok Mehbratu, York Univ. (Canada)
Richard Hornsey, York Univ. (Canada)

Published in SPIE Proceedings Vol. 6557:
Head- and Helmet-Mounted Displays XII: Design and Applications
Randall W. Brown; Colin E. Reese; Peter L. Marasco; Thomas H. Harding, Editor(s)

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