Investigation of Power Transmission of a Helium Plasma Jet to Different Dielectric Targets Considering Operating Modes

Teschner, Tilman; Bansemer, Robert; Weltmann, Klaus‐Dieter; Gerling, Torsten

doi:10.3390/plasma2030027

Cited by 11 publications

(6 citation statements)

References 37 publications

(47 reference statements)

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“…The uncertainty in figure 6 can be attributed to transient fluctuations in the magnitude and timing of the plasma current associated with streamer ignition and the complex flow field produced by the perpendicular gas streams. The results of the power calculations in this work were confirmed using power calculations determined through the Lissajous method [31,32].…”

Section: Electrical Characterizationsupporting

confidence: 65%

Extending the volume of atmospheric pressure plasma jets through the use of additional helium gas streams

Johnson¹,

Boris²,

Petrova³

et al. 2020

Plasma Sources Sci. Technol.

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Atmospheric pressure plasma jets are a promising tool for a variety of applications. However, the small size of atmospheric pressure plasma jets limits their use to small scale processes and materials treatment. To address this issue, this work describes how to increase the plasma volume without additional power supplies or circuitry. Instead, additional noble gas streams are positioned orthogonal to the jet's direction of propagation which generates new plasma regions along these streams. This approach increases the plasma volume, which also increase the effective area available to interact with surfaces. The resulting augmented plasma is characterized with electrical, imaging, and time-integrated optical emission spectroscopy techniques. With these additional gas streams, the power required to drive the plasma jet increases sublinearly with the plasma volume, making this an attractive method to generate large area plasmas efficiently. The emission intensity of the He-air plasma lines along the plasma jet were compared to those in the added noble gas streams and were found to be similar in magnitude and follow similar trends as the main plasma jet. There does not appear to be a limit on the number of noble gas streams that can be added downstream of the plasma jet and thus volume expansion.

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Section: Electrical Characterizationsupporting

confidence: 65%

Extending the volume of atmospheric pressure plasma jets through the use of additional helium gas streams

Johnson¹,

Boris²,

Petrova³

et al. 2020

Plasma Sources Sci. Technol.

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show abstract

“…The electrical charge Q = C m • U C was used to calculate the dissipated energy. From the measured driving voltage V In , the capacitance C m and the voltage drop over the capacitor U C the energy per period E t0−t1 was calculated according to equation (1) [18][19][20][21]. For a higher measurement accuracy, 16 individual periods were averaged, which were uniformly distributed over the burst…”

Section: Electrical Energymentioning

confidence: 99%

Characterization and comparability study of a series of miniaturized neon plasma jets

Jablonowski,

Hoffmann,

Bansemer

et al. 2024

J. Phys. D: Appl. Phys.

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During the development of new therapeutic devices, comprehensive experimental investigations are necessary in all phases of the process. This requires the provision of device prototypes with reproducible and comparable operating parameters. In the current study, such miniature neon plasma jet prototypes designated for medical applications have been manufactured, characterized, and compared. The multi-parametric characterization included measurements of energy, power, temperature, leakage current, effluent length, and relative as well as absolute radiation. The dissipated electrical power and the optical emission in the UV range were identified as parameters indicating definable tolerances to sort out a device with inadequate species output. A liquid phase model was used to investigate reactive species deposition into simple matrices. Based on these investigations, a quality control procedure for manufacturing new device series is proposed. In conclusion, our findings suggest a test concept of achieving reproducible and comparable plasma device characterization as a putative quality control measure for lab-scale plasma source production.

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“…The sensitivities to the dielectric properties of the surface of plasma jets striking surfaces are well acknowledged [40][41][42]. Given the large variability in skin electrical properties in moisture and oil content, and location on the body, these sensitivities should be a high priority in optimizing plasma treatment of follicles.…”

Section: Skin Propertiesmentioning

confidence: 99%

Atmospheric pressure plasma treatment of skin: penetration into hair follicles

Konina,

Freeman,

Kushner

2023

Plasma Sources Sci. Technol.

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Sterilization of skin prior to surgery is challenged by the reservoir of bacteria that resides in hair follicles. Atmospheric pressure plasma jets (APPJs) have been proposed as a method to treat and deactivate these bacteria as atmospheric plasmas are able to penetrate into structures and crevices with dimensions similar to those found in hair follicles. In this paper, we discuss results from a computational investigation of an APPJ sustained in helium flowing into ambient air, and incident onto a layered dielectric similar to human skin, in which there are idealized hair follicles. We found that, depending on the location of the follicle, the bulk ionization wave incident onto the skin, or the surface ionization wave on the skin, are able to launch ionization waves into the follicle. The uniformity of treatment of the follicle depends on the location of the first entry of the plasma into the follicle on the top of the skin. Typically, only one side of the follicle is treated on for a given plasma pulsed, with uniform treatment resulting from rastering the plasma jet across the follicle. Plasma treatment of the follicle is sensitive to the angle of the follicle with respect to the skin, width of the follicle pocket, conductivity of the dermis and thickness of the underlying subcutaneous fat layer, the latter due to the change in capacitance of the tissue.

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Investigation of Power Transmission of a Helium Plasma Jet to Different Dielectric Targets Considering Operating Modes

Cited by 11 publications

References 37 publications

Extending the volume of atmospheric pressure plasma jets through the use of additional helium gas streams

Extending the volume of atmospheric pressure plasma jets through the use of additional helium gas streams

Characterization and comparability study of a series of miniaturized neon plasma jets

Atmospheric pressure plasma treatment of skin: penetration into hair follicles

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