Diagnosis of discharge plasma using atmospheric pressure pulsed discharge in air

An organic glass reactor was invented with nozzles-plate electrode coated with TiO₂ and supplied with negative pulsed high voltage. OH radical was diagnosed by optical emission spectroscopy (OES) and the rotational temperature of the OH radical was analyzed by the software of LIFBASE based on the OH radical´s OES. The effects of the pulse peak voltage, the pulse repetition frequency, different situations of the discharge nozzles or the grounded plate with TiO₂ film on the relative intensity of OH radical´s OES and the rotational temperature of OH radical were studied by the experiments. The results show that the TiO₂ coated on the nozzles or the plate could be activated by the ultraviolet ray from the negative pulsed discharge in the experiments and more OH radicals were produced. The relative number of the OH radical and the temperature of the discharge plasma increase with the input energy of the reactor and the area of the TiO₂ film on the nozzles or the plate electrode. It is not helpful for the OH radical´s production when the grounded plate was coated with TiO₂ too thick. However, the number of the OH radicals went up and the temperature of the discharge plasma increased when the nozzles discharge electrode coated twice.