4. The experimental setup.

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A two-fiber spectroscopic system was assembled using a simple diode array spectrometer (Ocean Optics Inc., USA). The bandwidth of each spectral bin was 2 nm. The source was a white light source (Ocean Optics Inc., USA). The system operated over the 380-820 nm range.

Two probes were built.

One probe was a pair of optical fibers inserted into two hollow stainless steel tubes, terminating at a rod that was polished at 45 degrees so as to act as a mirror. This mirror deflected photons from the source fiber out of a hole in the tube (source) and deflected collected photons through the hold into the collector fiber (collector).

The other probe was a set of 7 source fibers surrounding a central collection fiber. The fibers were 200 um in diameter with 200 um center-to-center spacing between fibers.

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