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Proceedings Paper

Sapphire tube waveguide as a potential basis for high-temperature Raman spectroscopy
Author(s): Michael Fraser; Evan Lally; Anbo Wang
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Paper Abstract

Raman spectroscopy has become an established method for determining the composition of gaseous samples at low temperatures (<1000°C). However, the design of a Raman sensor which operates at high temperatures (>1000°C) remains elusive. This work investigates the feasibility of high-temperature Raman spectroscopy utilizing a monolithic sapphire tube as a sample cell and signal collection optic. The insertion loss of small-diameter, single-crystal sapphire tubing is measured to be 0.26-0.40dB/cm, proving its potential for use as a short-distance waveguide. Relevant system losses are characterized for a fiber-based, reflection mode Raman sensor, and expected Raman signal powers are predicted by simulation for the gaseous combustion products of ethylene: N2, CO, CO2, H2, and H2O. The successful implementation of a Raman sensor as described by this research could enable real-time analysis of exhaust gases from a hydrocarbon combustor. Furthermore, the extension of Raman spectroscopy to high temperatures would be a critical step towards more precisely controlled, fuel-efficient technologies.

Paper Details

Date Published: 16 May 2011
PDF: 7 pages
Proc. SPIE 8034, Photonic Microdevices/Microstructures for Sensing III, 80340M (16 May 2011); doi: 10.1117/12.895341
Show Author Affiliations
Michael Fraser, Virginia Polytechnic Institute and State Univ. (United States)
Evan Lally, Virginia Polytechnic Institute and State Univ. (United States)
Anbo Wang, Virginia Polytechnic Institute and State Univ. (United States)

Published in SPIE Proceedings Vol. 8034:
Photonic Microdevices/Microstructures for Sensing III
Hai Xiao; Xudong Fan; Anbo Wang, Editor(s)

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