The ability to detect images through a scattering cloud of limited extent, such as that from a grenade or continuousdispersion during daylight hours depends on both the transmittance and the contrast reduction due to the scattering into thedetector from the sun from the same direction. In this paper the two effects have been defined so as to permit comparisonbetween their relative magnitudes and applied to the results of field measurements. Examples of the data and analyticalforms are presented. To compute the result, the aerosol densities throughout the cloud would be required as functions oftime and this was not feasible, however, a simplified model assuming constant aerosol density was formed and goodagreement with the functional dependencies was found.
展开▼
