Abstract

We report high-precision measurements of the absorption and the reduced scattering coefficients for turbid media. Using a frequency-domain measurement technique for a point-source infinite-medium geometry, we find that the standard deviations of multiple measurements of the absorption coefficient ${\mu }_a$ and the reduced scattering coefficient $\mu _s{}^{\prime }$ are less than 0.6%, and three independently derived values for ${\mu }_a$ and $\mu _s{}^{\prime }$ agree to better than 1%. Measurements of ${\mu }_a$ agree with measurements of a nonscattering medium to within 1.2%. To obtain high precision requires attention to proper conditions for the spherical photon-density wave model, the detection linearity, and the ratio of the absorption rate to the source modulation rate. Frequency-domain amplitude and phase measurements deviate from fitted curves by 0.1% and 0.06° rms, respectively.

© 1999 Optical Society of America

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