A Comparison of Radar REMPI and Laser Induced Fluorescence for Concentration Measurements Conference Paper uri icon


  • © 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All right reserved. This paper aims to compare the capabilities of radar REMPI, a microwave based plasma diagnostic developed for the measurement of chemical species concentrations, against laser induced fluorescence (LIF), one of its more mature and well established counterparts in the literature. Amongst others, the sensitivity and accuracy of both these methods are evaluated through experiments conducted on atomic and molecular species at room temperature and in a flame. The results are largely in favor of LIF, in particular due to a loss of sensitivity in the case of radar REMPI at lower laser fluences. However, a redeeming aspect is that the data from both techniques are in reasonably good agreement at high fluences, a suggestion that radar REMPI could perform equally well if its sensitivity can be enhanced. While the overall potential of radar REMPI still remains, for instance in applications involving remote sensing and detection of non-fluorescing molecules, this study highlights the inadequacies of this method when attempting to obtain quantitative, interference-free concentration measurements. Further advancement of radar REMPI in this direction will require new ways of augmenting the signal sensitivity, such as increasing the microwave power.

author list (cited authors)

  • Chng, T. L., & Miles, R. B.

publication date

  • January 2016