We have recently measured a strong temperature dependence of the CO2 absorption cross-section in the ultraviolet (between 200 and 350nm). In the range between 1000 and 3000 K, both the magnitude and the spectral shape of the absorption cross-section vary with temperature providing a potential new diagnostic tool. The viability of this diagnostic strategy to determine gas temperature in combustion systems and shock-heated gases is reported here. Preliminary demonstration measurements with either a broadband light source or selected fixed-wavelength lasers in pulse-detonation engines (PDEs) and shock-heated gas mixtures have illustrated the potential to determine time-resolved temperature from CO2 absorption measurements.
© 2004 Optical Society of AmericaPDF Article