Inside Back Cover: Plasma Process. Polym. 2/2022

Operation mode recognition of surface microdischarge based on the gray level histogram

“…As O 3 will eventually disappear in the transition mode and with the final gas phase products being the same as in the NO x mode, [ 42 ] the operation mode in this study was simply defined as the ozone and non‐ozone modes (including the transition mode and NO x mode).…”

“…As the V p–p for the same plasma source increased, the discharge power consumption of the SMD device increased, the discharge intensity became more severe, the discharge brightness became stronger, and the discharge area became larger. When the V p–p remained constant, the discharge power consumption of plasma source 1 was greater than that of plasma source 2, [ 42 ] and the discharge intensity, discharge brightness, and discharge area were larger than those of plasma source 2.…”

“…Additionally, the discharge power density of the SMD increases with an increase in the V p–p . [ 42 ] Figure 6 shows that the features extracted from the GLH are related to the V p–p , which is equivalently related to the discharge power density; therefore, the operation mode transformation is related to the features. It may be possible to detect the operation mode of the SMD using the features extracted from the GLH.…”

“…In our previous study, it was found that the dielectric properties could significantly affect the mode transformation of SMD; for example, the thickness of the dielectric sheet has a negative correlation with the mode transformation voltage. [ 42 ] Therefore, in this investigation, two different SMD plasma sources with different dielectric sheet thicknesses were used to verify the results and the effectiveness of the proposed method for mode transformation recognition through visible images of the discharge. Figure 4 shows that the breakdown voltage and transfer voltage for the different operation modes of the two SMD plasma sources are different.…”