Non-coincident multi-wavelength emission absorption measurements in MHD plasmas.

Physics

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Plasma: Radiative Transfer

Scientific paper

An analysis of the effect of non-coincident sampling on the measurement of atomic number density and temperature by multi-wavelength emission absorption methods is presented under the assumption that the emission and transmitted lamp signals are time resolved but not coincident. The analysis shows that the averages of such measurements are valid despite fluctuations in temperature and optical depth. Under potassium-seeded MHD conditions the fluctuations introduce additional uncertainty into measurements of potassium atom number density and temperature but do not significantly bias the average results. Measurements in a prototype-scale MHD flow with coincident and non-coincident sampling support the analysis.

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