Electron density measurements in an atmospheric pressure air plasma by means of infrared heterodyne interferometry

An infrared heterodyne interferometer has been used to measure the spatial distribution of the electron density in direct current, atmospheric pressur e discharges in air. Spatial resolution of the electron density in the high -pressure glow discharge with characteristic dimensions on the order of 100 mu m required the use of a CO2 laser at a wavelength of 10.6 mu m For this wavelength and electron densities greater than 10(11) cm(-3) the index of refraction of the atmospheric air plasma is mainly determined by heavy part icles rather than electrons. The electron contribution to the refractive in dex was separated from that of the heavy particles by taking the different relaxation times of the two particle species into account. With the dischar ge operated in a repetitive pulsed mode, the initial rapid change of the re fractive index was assumed to be due to the increase in electron density, w hereas the following slower rise is due to the decrease in gas density caus ed by gas heating. By reducing the time between pulses, direct current cond itions were approached, and the electron density as well as the gas density , and gas temperature, respectively, were obtained through extrapolation. A computation inversion method was used to determine the radial distribution of the plasma parameters in the cylindrical discharge. For a direct-curren t filamentary discharge in air, at a current of 10 mA, the electron density was found to be 10(13) cm(-3) in the centre, decreasing to half of this va lue at a radial distance of 0.21 mm. Gaussian temperature profiles with sig ma = 1.1 mm and maximum values of 1000-2000 K in the centre were also obtai ned with, however, larger error margins than for electron densities.