Spectroscopic studies of a prototype electrically pumped COIL system

W. Terry Rawlins; Seonkyung Lee; William J. Kessler; David B. Oakes; Lawrence G. Piper; Steven J. Davis

doi:10.1117/12.537751

11 May 2004 Spectroscopic studies of a prototype electrically pumped COIL system

W. Terry Rawlins, Seonkyung Lee, William J. Kessler, David B. Oakes, Lawrence G. Piper, Steven J. Davis

Proceedings Volume 5334, Gas and Chemical Lasers, and Applications III; (2004) https://doi.org/10.1117/12.537751
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States

Abstract

This paper discusses methods, using non-intrusive diagnostic techniques, to characterize the detailed dynamics of I* gain and O₂(a¹Δ) yield on a laboratory microwave-discharge flow reactor, for conditions relevant to the electrically driven COIL concept. The key diagnostics include tunable diode laser absorption measurements of I* small-signal gain and temperature, high-precision absorption measurements of reactor I₂ concentrations, absolute and relative spectral emission measurements of O₂(a¹Δ) and I* concentrations, and air-afterglgow determinations of O concentrations. We have characterized variations in O and O₂(a) yields with discharge power and oxygen mole fraction. We observe O₂(a) yields to increase dramatically with decreasing oxygen mole fraction. We have also demonstrated a spectral fitting analysis technique capable of quantifying the presence of vibrationally excited O₂(a,v). This combined suite of diagnostics offers a comprehensive approach to performance characterization for electrically driven COIL concepts.

Citation Download Citation

W. Terry Rawlins, Seonkyung Lee, William J. Kessler, David B. Oakes, Lawrence G. Piper, and Steven J. Davis "Spectroscopic studies of a prototype electrically pumped COIL system", Proc. SPIE 5334, Gas and Chemical Lasers, and Applications III, (11 May 2004); https://doi.org/10.1117/12.537751

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