Two wavelength-CARS thermometry of hydrogen

In this work, we present the results of two-wavelength (2)-CARS thermometry of hydrogen at temperatures from 300–1200 K. The choice of the pair of spectral lines for the 2-CARS thermometer with respect to optimal temperature sensitivity within a given temperature range was analysed. Software was developed to process the experimental data and calculate the temperature. In the experiments, temperature and density were measured in a heated cell using single-shot and averaged CARS intensities in the pure rotationalS branch. The accuracy achieved and its dependence on measured temperature values and on the number of averaged shots was analysed.The sponsoring of this work by the Stabsabteilung Internationale Beziehungen at the Kernforschungszentrum Karlsruhe under project number RUS 222.12 is gratefully acknowledged