Substrate Effects On Two-dimensional Radiative Back-scattering From Shallow Media


Experimental measurements of anisotropic back-scattering from finite optically thick media exposed to a laser beam are presented. The laser beam is incident normal to the first surface of a scattering medium whose substrate is a diffuse reflector. Measurements are made for two substrates (white — nearly 100% reflecting, and black - nearly 100% absorbing) to study the effect of substrate reflection on backscatter. Latex particles of uniform size (diameter - 0.18 μm) are used as scattering centers in a water solution. Results are presented for back-scattered radiation in the normal direction as a function of optical radius from the laser beam, optical thickness of the scattering medium, and the character of the substrate for albedos near one. It is shown that the character of the substrate can be important for optical depths up to 20. The white reflecting substrate always produces greater back-scattered radiation than the black absorbing substrate when affects of the substrate are detectable. A correlation is developed which predicts the onset of substrate effects on the back-scattered radiation.


Mechanical and Aerospace Engineering


National Science Foundation, Grant CBT 85-01099

Document Type

Article - Conference proceedings

Document Version


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Publication Date

01 Jan 1987