The influence of targets on NO in a pulsed kHz plasma jet measured by LIF

Laser-induced fluorescence (LIF) is employed for in-situ measurement of nitric oxide (NO) density in an atmospheric pressure argon plasma jet driven by a pulsed power supply. The study provides insights into the temporal evolution and spatial distribution of NO. The influences of voltage, flow, gas mixture and discharge frequency variations on the NO density are discussed. Additionally, the decay characteristics of LIF signals are also analyzed. The gas temperature is assessed by obtaining and fitting a LIF spectrum, indicating a low-temperature plasma. The impact of the water on the NO production in the plasma is investigated. Results suggest that the distance between the water and the plasma jet nozzle can differently affect the discharge morphology and NO distribution in the plasma plume.