9 December 1999 Raman measurement in gas flows using a high-power laser diode
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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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ricardo Claps, Manfred Fink, Philip L. Varghese, "Raman measurement in gas flows using a high-power laser diode", Proc. SPIE 3859, Optical Online Industrial Process Monitoring, (9 December 1999); doi: 10.1117/12.372929; https://doi.org/10.1117/12.372929
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