Comparative study of some fiber-optic remote Raman probe designs. Part I: Model for liquids and transparent solids
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208 (United States)
We have developed models describing the sensitivity and sampling volume of various remote fiber-optic Raman probes{emdash}single-fiber, lensed, dual-fiber beveled-tip, dual-fiber flat-tipped, and multi-fiber flat-tipped. The models assume clear samples and incorporate radii, separation, bevel angle, and numerical aperture of the fibers; overlap geometry of illumination and excitation light cones; and refractive index of immersion medium. For the Raman spectra of solid samples in air, single-fiber and lensed probes are predicted to yield the highest Raman signal. Beveled probes should provide greater Raman signal strength than do flat-tipped probes because beveled probes can collect light from a restricted volume closer to the probe end. Although multiple collection fibers improve Raman signal strength, progressively distance concentric fiber rings contribute less and sample material further from the probe. {copyright} {ital 1996} {ital Society for Applied Spectroscopy}
- Research Organization:
- Hanford Engineering Development Laboratory
- DOE Contract Number:
- AC06-87RL10930; W-7405-ENG-48
- OSTI ID:
- 542536
- Journal Information:
- Applied Spectroscopy, Vol. 50, Issue 7; Other Information: PBD: Jul 1996
- Country of Publication:
- United States
- Language:
- English
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