Journal
APPLIED SPECTROSCOPY
Volume 60, Issue 2, Pages 109-114Publisher
SAGE PUBLICATIONS INC
DOI: 10.1366/000370206776023340
Keywords
Raman; subsurface; photon migration; mapping; fiber-optic probe
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Funding
- NIAMS NIH HHS [R01 AR052010, P30 AR46024, R01 AR047969] Funding Source: Medline
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We report the use of a fiber-optic probe with global illumination and an array of 50 collection fibers (PhAT probe, Kaiser Optical Systems, Inc.) to obtain Raman spectra and 50 spatial element maps of polymers through overlayers of other polymers that are highly scattering. Band target entropy minimization (BTEM) is used to recover the spectra of the subsurface components and generate maps of their distributions. This approach to subsurface mapping is tested with model systems consisting of two or three layers of polyethylene, polytetrafluoroethylene (Teflon), and polyoxymethylene (Delrin) arranged in different geometries. Raman spectra and maps were obtained through overlayer thicknesses of tip to 13 mm. Subsurface spatial resolution is achieved because each fiber views an asymmetric distribution of Raman scattered light from surface and subsurface components that depends on the position of the fiber relative to the depth and position of a component and the extent of photon diffusion through the system.
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