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Many applications seek to measure a sample's absorption coefficient spectrumto retrieve the chemical makeup. Many real world samples are optically turbid,causing scattering confounds which many commercial spectrometers cannotaddress. Using diffusion theory and considering absorption and reducedscattering coefficients on the order of 0.01 per mm and 1 per mm, respectively,we develop a method which utilizes frequency-domain to measure absolute opticalproperties of turbid samples in a standard cuvette (45 mm by 10 mm by 10 mm).Inspired by the self calibrating method, which removes instrumental confounds,the method uses measurements of the diffuse complex transmittance at two setsof two different source-detector distances. We find: this works best for highlyscattering samples (reduced scattering coefficient above 1 per mm); higherrelative error in the absorption coefficient compared to the reduced scatteringcoefficient; accuracy is tied to knowledge of the samples index of refraction.Noise simulations with 0.1 percent amplitude and 0.1 deg (1.7 mrad) phaseuncertainty find errors in absorption and reduced scattering coefficients of 4percent and 1 percent, respectively. We expect that higher error in theabsorption coefficient can be alleviated with highly scattering samples andthat boundary condition confounds may be suppressed by designing a cuvette withhigh index of refraction. Further work will investigate implementation andreproducibility.

Method for Measuring Absolute Optical Properties of Turbid Samples in a Standard Cuvette