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The Diffuse Reflection of Light by Milk¹

Department of Dairy Industry, Cornell University, Ithaca, N. Y.

ABSTRACT

Much of the light striking the surface of a layer of milk is reflected. The total reflection is made up of a specular reflection from the surface, which is independent of the thickness of layer, and a diffuse reflection from the interior, which depends upon the thickness of layer.

Diffuse reflection data are of value because they provide a basis for calculating the amount of light absorbed by milk and for estimating the effective depth of penetration of light into milk. Hence such data are presented in this paper.

APPARATUS AND PROCEDURE

Figure 1 shows the major components of the reflectance apparatus. They were: a hollow sphere coated on the inside with magnesium oxide, a reflectance cell, and a multiplier photometer. The incident monochromatic light traveled diametrically through the sphere and struck the reflectance cell. Practically all of the light diffusely reflected by the milk particles was trapped in the sphere and its intensity was measured by the photometer.

¹ Based in part on material taken from a thesis presented by the senior author to the faculty of the Graduate School of Cornell University in partial fulfillment of the requirement for the degree of Doctor of Philosophy, February, 1954.

² Present address: Department of Chemical Engineering, University of Toronto, Toronto, Ontario.