Sapphire tube waveguide as a potential basis for high-temperature Raman spectroscopy

Michael Fraser; Evan Lally; Anbo Wang

doi:10.1117/12.895341

16 May 2011 Sapphire tube waveguide as a potential basis for high-temperature Raman spectroscopy

Michael Fraser, Evan Lally, Anbo Wang

Proceedings Volume 8034, Photonic Microdevices/Microstructures for Sensing III; 80340M (2011) https://doi.org/10.1117/12.895341
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

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.

Citation Download Citation

Michael Fraser, Evan Lally, and Anbo Wang "Sapphire tube waveguide as a potential basis for high-temperature Raman spectroscopy", Proc. SPIE 8034, Photonic Microdevices/Microstructures for Sensing III, 80340M (16 May 2011); https://doi.org/10.1117/12.895341

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