Abstract
Henyey-Greenstein (H-G) phase function is typically used as an approximation to Mie phase function and its shortcomings have been discussed in numerous papers. But the judicious criterion of when the H-G phase function would be valid is still ambiguous. In this paper, we use the direct sample phase function method in transmittance calculation. A comparison of the direct sample phase function method and the H-G phase function is presented. The percentage of the multiple scattering in Monte Carlo transfer computations is discussed. Numerical results showed that using H-G phase function led to underestimating the transmittance. The deflection of root means square error can be used as a criterion. Although the exact calculation of sample phase function requires slightly more computation time, the rigorous phase function simulation method has an important role in the Monte Carlo radiative transfer computation problems.
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