We present and develop an approach using optical interference and heterodyne technology to investigate the light migration in highly scattering media. The theoretical model is based on diffusion approximation in steady-state frequency domain. The model incorporates pair-photon dipole source in order to satisfy the emulsion boundary condition and is suitable for either refractive index matched or mismatched surface. The experimental results showed that the diffusion theory applies in this study. Under the appropriate boundary and interference condition, the study accurately estimates the optical parameters of the medium.