Emissive Versus Attenuating Smokes.

摘要

Emissive smoke clouds reduce visibility by attenuating the image that is being viewed along with superimposing scattered and emitted radiation onto that image. Thus, contrast and signal to noise ratio are reduced by a combination of attenuation (governed by the extinction coefficient), scatter (governed by the single scatter albedo), and emission (governed by single scatter albedo and cloud temperature). Two alternate approaches are investigated. First, the entire cloud including air is heated. Secondly, flare particles are placed within a scattering smoke. The first approach is found to be impractical because of energy requirements and cloud buoyancy while the second approach appears to significantly reduce contrast and signal to noise.