Visual Acuity With Second And Third Generation Night Vision Goggles Obtained From A New Method Of Night Sky Simulation Across A Wide Range Of Target Contrast PDF Download
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Total Pages | : 43 |
Release | : 1992 |
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Download Visual Acuity with Second and Third Generation Night Vision Goggles Obtained from a New Method of Night Sky Simulation Across a Wide Range of Target Contrast Book in PDF, ePub and Kindle
The purpose of this investigation was to study the primary factors which influence visual acuity (VA) with night vision goggles (NVGs). These factors are: night sky condition, target contrast, and NVG generation. Improved methods were used to simulate the night sky and to control for differences in target contrast which result from dissimilarities in spectral sensitivity between NVG generations. The new simulation method used combinations of spectrally flat (neutral density) and wavelength selective (blue glass) filters to reproduce the spectral distribution of the night sky across the entire NVG response range. Between-generation differences in target contrast were eliminated by weighting the incident radiant flux by the sensitivity of the detector. It was found that the difference in VA between the two generations widens under two conditions: (1) when target contrast is constant and night sky irradiance decreases, and (2) when night sky irradiance is constant and target contrast decreases. Furthermore, it was found that for a given NVG generation, VA falls off more rapidly for a low contrast target than for one of high contrast when night sky irradiance decreases.
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Total Pages | : 1556 |
Release | : 1992 |
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Total Pages | : 46 |
Release | : 1994 |
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Author | : R. Hradaynath |
Publisher | : SPIE-International Society for Optical Engineering |
Total Pages | : 1050 |
Release | : 2001 |
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This collection of 104 papers is divided into two parts. Part One, Image Intensification, focuses on developments with image intensified tubes. Part Two, Thermal Imaging, concentrates on the practical applications of night vision technology for its main users: the armed forces.
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Total Pages | : 1130 |
Release | : 1992 |
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Total Pages | : 30 |
Release | : 1994 |
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Publisher | : SPIE-International Society for Optical Engineering |
Total Pages | : 370 |
Release | : 1997 |
Genre | : Technology & Engineering |
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Release | : 1992 |
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A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
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Total Pages | : 1216 |
Release | : 1994 |
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Total Pages | : 782 |
Release | : 1993 |
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