Measurement of gas concentrations by means of the power saturation technique in a microwave cavity spectrometer

The power saturation technique in microwave spectrometry involves measuring a coefficient /spl Gamma/ under conditions of "power saturation". This paper gives a general expression of /spl Gamma/ for various radiation field configurations in the gas cell. Concentrations of ethylene oxide gas were measured in a microwave spectrometer with a resonant cavity gas cell by using this technique. A relatively good linear correlation was found (to within a standard deviation of 4%) between the output signal and the concentration of ethylene oxide gas in the cavity.<
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