Abstract
Abstract : This project focuses on the development of diagnostic methods for electron density and gas temperature measurements of microdischarges in atmospheric pressure air, two of the most important plasma parameters for any plasma application. Two types of diagnostic techniques have being explored: emission spectroscopy for temperature measurements and two wavelength laser heterodyne interferometry for electron density. They were applied to glow discharges in atmospheric pressure air with dimensions in the millimeter range and less. Temperature measurements on this type of discharge have confirmed earlier studies where the temperature was found to be on the order of 2,000 K. A dual-wavelength heterodyne laser interferometer has been built and tested, however the results indicated, that the stability of the lasers is not sufficient for recording of the phase changes caused by these micro discharges. Suggestions for improvement of the diagnostic device are given.
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