Scattering functions

ECE532 Biomedical Optics
Steven L. Jacques, Scott A. Prahl
Oregon Graduate Institute

The angular dependence of scattering is called the scattering function, p() which has units of [sr-1] and describes the probability of a photon scattering into a unit solid angle oriented at an angle relative to the photons original trajectory. Note that the function depends on only on the deflection angle and not on the azimuthal angle . Such azimuthally symmetric scattering is a special case, but is usually adopted when discussing scattering. However, it is possible to consider scattering which does not exhibit azimuthal symmetry. The p() has historically been also called the scattering phase function.

The scattering can be described in two ways:

Figure depicts a typical forward-directed scattering pattern p()
corresponding to an experimental goniometric measurement in a single source-scatterer-observer plane,
and p()2sin which integrates over all possible azimuthal angles .

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