Abstract

A calculation is made of the doubly back scattered radiation from the intersection volume and the close-range volume. A comparison of the results for singly and doubly scattered radiation with experimental data enables the limits of applicability of the equations to be determined. It is shown that for scattering coefficients in fog ofσ < 0.06 m−1 the scattered radiation field is caused by single scattering but whenσ increases to 0.6 m−1 only the doubly scattered radiation from the intersection and close-range volumes need be considered.

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