A-2
4. Next the decrease of the initial ΔTo between target and background, due to atmospheric transmission, must be considered:
ΔT(R) = ΔTo.e-σ.R
NOTE: Because an exponential decrease of atmospheric transmission is assumed, two straight lines can be drawn on log scale with a slope, relating to the two different extinction coefficients.
5. The respective nominal static ranges are given by the intersections of ΔT(R) and the appropriate functions (see fig.2, 3 and 4).
