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. Author manuscript; available in PMC: 2021 Oct 20.
Published in final edited form as: Appl Opt. 2004 May 10;43(14):2846–2860. doi: 10.1364/ao.43.002846

Fig. 1.

Fig. 1.

(a) Side and (b) cross-sectional views of the evaluated fiber-optic probes. Probe 1 was a dichroic beam-splitter-based single-fiber arrangement with common illumination and collection channels. Probes 2 and 3 were bifurcated, with a central illumination channel and a peripheral collection ring. The illumination channel of probe 2 consisted of a tapered fiber. The diameters of the illumination cores and the source-to-detector distances (center to center) are marked c and s, respectively. Diffuse reflectance at 337 nm was collected as a function of PTD d. Open (filled) arrows or circles indicate illumination (collection) paths. Probe views are drawn to scale.