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Proceedings Paper

Fiber optic sensor for general anesthetics based on Raman spectroscopy
Author(s): Hillary L. MacDonald; Hao Liu; Paul Yager
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Paper Abstract

Vibrational spectroscopy and chemometrics together can be used to identify and quantify low concentrations of small molecules, but the Raman effect has been considered too weak to be employed for remote fiber optic sensing of such gases. Preliminary data are presented suggesting that it is possible to enhance Raman signals of gases from a small probe. Polymers that have large partition coefficients for small nonpolar molecules such as general anesthetics can be used as selective absorbents for these gases. As long as the polymers do not luminesce or Raman scatter at interfering frequencies, they increase the signal-to-noise ratio of signals from absorbed molecules. Multipass cells are often used to enhance Raman scattering from gases. Forming an absorbent polymer into a ring with one or more optical `taps' allows recirculation of the excitation light, and extraction of the contrarotating Raman scattered light. Such a ring could be the basis of a small probe to be connected to a compact Raman instrument by optical fibers. These two methods of amplification improve signal-to-noise ratio, extend sensing range, and reduce both instrumental complexity and cost of sensors.

Paper Details

Date Published: 28 July 1994
PDF: 11 pages
Proc. SPIE 2131, Biomedical Fiber Optic Instrumentation, (28 July 1994); doi: 10.1117/12.180750
Show Author Affiliations
Hillary L. MacDonald, Univ. of Washington (United States)
Hao Liu, Univ. of Washington (United States)
Paul Yager, Univ. of Washington (United States)


Published in SPIE Proceedings Vol. 2131:
Biomedical Fiber Optic Instrumentation
James A. Harrington; David M. Harris; Abraham Katzir; Fred P. Milanovich, Editor(s)

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