Abstract

According to the response of photoelectric device to a light source, the formula of spectral matching factor of photo cathode-object combination is deduced. The spectral matching factors of Super S₂₅ and New S₂₅ photo cathodes for green vegetation and rough concrete are calculated and compared. For Super S₂₅₁, the spectral-matching factors for green vegetation and rough concrete are 0.707 and 0.743, respectively, under the full-moon radiation and are 0.504 and 0.577, respectively, under the clear-star radiation. For Super S₂₅₂, the full-moon factors are 0.561 (green vegetation) and 0.732 (rough concrete), and those for clear-star radiation are 0.338 (green vegetation) and 0.471 (rough concrete). For New S₂₅, the full-moon factors are 0.741 (green vegetation) and 0.762 (rough concrete), and those for clear-star radiation are 0.603 (green vegetation) and 0.657 (rough concrete). An analysis of results shows that the spectral-matching factor has influence on the performance of a low-light level night vision system and is essential for evaluating the visual range of a night-vision system.

© 2004 Optical Society of America

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