Techniques for determining the properties foam are of interest due to the number of industrial process in which they play a significant role. A technique known as diffusing-wave spectroscopy has shown promise as a method for determining the radiative properties of foam. In diffusing-wave spectroscopy, an amplitude modulated laser beam is injected into the foam layer, and the reflected flux and the phase shift between the incident and the reflected beams are measured. Relationships between these measurable quantities and the radiative properties of the foam are derived using the diffusion approximation. The objective of this paper is to investigate the conditions for which the diffusion approximation accurately predicts the time dependent reflectance of a laser pulse from the surface of a non-absorbing from layer. The accuracy of the diffusion approximation is assessed by comparison with Monte Carlo simulations.

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