Abstract
Noise analysis of the signal from a non-optical microwave plasma detector for gas chromatography is presented. The signal in this detector is reflected microwave power. White noise, low-frequency 1/ f noise and high-frequency discrete noise were the major noise types observed in the frequency window considered (0−200 Hz). The overall magnitude of the noise spectra exhibited a marked dependence on the degree of coupling of power to the microwave cavity and, to a lesser extent, on the flow-rate of the plasma gas. The noise did not change consistently as the plasma tube cooling-water flow-rate was changed.
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