Abstract
Tunable Diode Laser Absorption Tomography (TDLAT) is a non-intrusive laser based measurement technique capable of determining two-dimensional spatially resolved distributions of temperature and species concentration in high enthalpy flows. TDLAT combines infrared tunable diode laser absorption spectroscopy with tomographic image reconstruction. TDLAT has been used at the University of Virginia’s Aerospace Research Laboratory on a flat flame burner providing spatially resolved water vapor concentration and temperature distributions for equivalence ratios of φ =0 .7 and φ =1 .0. The temperature results from the TDLAT reconstructions are compared to independent temperature measurements of the same burner by thermocouple traverse with favorable results. TDLAT measurements made on the flat flame burner are proof–of–concept for implementation of the system on a scramjet wind tunnel for use in supersonic combustion efficiency calculations.
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