Empirical model of the photon path length for a single fiber reflectance spectroscopy device

A reflectance spectroscopic device that utilizes a single fiber for both light delivery and collection has advantages over classical multi-fiber probes. This study presents a novel empirical relationship between the single fiber path length and the combined effect of both the absorption coefficient, μa(range: 0.1-6 mm-1), and the reduced scattering coefficient, μ′s(range: 0.3-10 mm-1), for different anisotropy values (0.75 and 0.92), and is applicable to probes containing a wide range of fiber diameters (range: 200-2000 μm). The results indicate that the model is capable of accurately predicting the single fiber path length over a wide range (r = 0.995; range: 180-3940 μm) and predictions do not show bias as a function of either μaor μ′s.

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