A simple method for determination of optical properties of turbid media

Accurate measurement of tissue optical properties is a key problem in study on optical distribution in tissue. Especially in near infrared range, it is still a hard problem because of affection of strong absorption of water. In this paper, P3 approximation for high absorption was applied theoretically, then device with high precision was designed experimentally for non-scattering transmission measurement and fluence rate measurement. SNR and measuring accuracy were improved by using dual-beam. With added absorber technique at both 632.8nm and 1064nm, optical parameters of 2% intralipid at 1064nm and 1% intralipid at 632.8nm wavelength were obtained. The radial distribution of light through application of Monte Carlo simulation agreed well with the experimental result, which indicated that the experiment system were accurate with root mean square (RMS) less than 8%, and that CuSO4 as added absorber at 1064nm and NIR was feasible. Optical parameters of turbid media can be measured in NIR.