Abstract
Different forms of low current back-discharge in air at atmospheric pressure with fly ash used as a dielectric barrier are discussed in the paper. The discharge was characterized in terms of optical emission spectra and current-voltage characteristics. The discharge emission spectra in the wavelength range of 200÷540 nm have been measured to investigate behavior of the species present in the fly ash when back-discharge is initiated. In normal conditions the emission spectra are dominated by atmospheric components (molecular nitrogen, atomic oxygen and nitrogen) but atomic lines due to chemical composition of the fly ash were also identified.
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