RAYLEIGH SCATTERING THERMOMETRY AT LOW TEMPERATURE USING NITROGEN AND CARBON DIOXIDE WITH HIGH RAYLEIGH SCATTERING CROSS SECTION AREA

摘要

Rayleigh scattering thermometry is a practically applicable non-invasive measurement technique to investigate a gas flow field. Experimental results of Rayleigh scattering thermometry at the low temperature region from 230 K to 310 K are discussed with applying nitrogen and carbon dioxide. More precise measurement can be achieved by applying the carbon dioxide gas with high Rayleigh scattering cross section area. Several issues which should be handled importantly for a closed visualization experiment system at low temperature, such as frost on windows, sealing for insulation, thermal stress-induced polarization, and visualization set-up, are discussed.