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Light scattered by coated paper

Angle-resolved light scattering (ARLS) was used to investigate the roughness of coatings on glossy paper. Angular spectra were measured for laser light scattered from several glossy paper samples and from uncoated paper. These spectra are compared to those calculated using the Beckmann model of a random surface that is isotropic and rough in two dimensions. Such a surface is characterized by its rms roughness and autocorrelation function, which are determined from surface profiles measured with a stylus instrument. There is very good agreement between the measured and the computed ARLS spectra. The surfaces are too rough to produce a specular beam large enough to provide an accurate value of the rms roughness, but ARLS provides information about the coating roughness when the measured spectra are cornpared to computed ones.