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Proceedings Paper

Raman measurement in gas flows using a high-power laser diode
Author(s): Ricardo Claps; Manfred Fink; Philip L. Varghese
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Paper Abstract

We present a technique to perform noninvasive, spatially- resolved measurements on low pressure, subsonic, laminar gas flows using Raman spectroscopy. From the Raman signal, the density and temperature conditions of the flow can be extracted directly, with reasonably low integration times. The use of a high power laser diode adds to the simplicity of the measurement, plus it makes it a very attractive low cost, efficient technique. Temperature regimes studied are from 290 K - 725 K, spatial resolution obtained is approximately 2.5 X 1.5 mm2 in the flow cross section, and 10-30 micrometers in the flow direction, within a flow profile of diameter approximately 1.5 cm. The flow was generated by a conical double nozzle system with CO2 at the center and Ar as sheath gas. The goal of the measurements is to study the gas dynamical focusing obtained, which will be used for future experiments on highly nonvolatile compounds.

Paper Details

Date Published: 9 December 1999
PDF: 12 pages
Proc. SPIE 3859, Optical Online Industrial Process Monitoring, (9 December 1999); doi: 10.1117/12.372929
Show Author Affiliations
Ricardo Claps, Univ. of Texas/Austin (United States)
Manfred Fink, Univ. of Texas/Austin (United States)
Philip L. Varghese, Univ. of Texas/Austin (United States)

Published in SPIE Proceedings Vol. 3859:
Optical Online Industrial Process Monitoring
Robert J. Nordstrom; Wim A. de Groot, Editor(s)

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