Abstract
Microwave cavity resonance spectroscopy is introduced and demonstrated as a new approach to investigate the generation of acoustic waves by a pulsed radio-frequency driven atmospheric-pressure plasma jet. Thanks to recent advancements in the diagnostic method, the lower detection limit for pressure changes in air is ∼0.3 Pa. Good agreement with conventional pressure transducer measurements with respect to the temporal evolution, the pressure amplitude and the spectral response is found. Fourier analysis revealed that the acoustic waves induced by the plasma can most likely be attributed to standing waves in the discharge geometry. Additionally, the plasma-induced acoustic waves of a few (tens of) Pa are proposed as an active mechanism in plasma medicine.
Highlights
Atmospheric-pressure plasma jets have proven themselves in various industrial applications such as plasma-assisted cleaning and coating [1], deposition [2] and sterilization [3]
Since this work focuses on acoustic waves, the period during which the plasma contribution dominates the shift/signal is omitted from the analysis
The temporal evolution, the pressure amplitude and spectra of the microwave cavity resonance spectroscopy (MCRS) and transducer measurements are in good agreement with each other
Summary
Atmospheric-pressure plasma jets have proven themselves in various industrial applications such as plasma-assisted cleaning and coating [1], deposition [2] and sterilization [3]. These sources have shown enormous potential in plasma medicine: e.g. wound healing [4], gene transfection [5] and cancer treatment [6].
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