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Article | REF: SE2072 V1

Opacity and visibility through fire smoke

Author: Eric GUILLAUME

Publication date: January 10, 2014

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4. Visibility models

4.1 Definition of visibility

Visibility, noted S, is of prime importance when considering evacuations, and depends on the level of contrast between an object and its surroundings. For an isolated object placed on a uniform background, the contrast C can be defined by the formula (7) . Under solar illumination conditions, the contrast of a black object placed on a white background is C = – 0.02

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