Measurements of the electron density and collision frequency of a one atmosphere uniform glow discharge plasma (OAUGDP/spl trade/) generated in a parallel plate reactor

2003 ◽  
Author(s):  
Yunqiang Yang ◽  
J.R. Roth ◽  
M.K. Howlader
Keyword(s):  
Glow Discharge ◽  
Electron Density ◽  
Parallel Plate ◽  
Discharge Plasma ◽  
Collision Frequency ◽  
Glow Discharge Plasma ◽  
Parallel Plate Reactor

Image processing of argon glow discharge plasma using interferometry

2015 ◽  
Vol 81 (5) ◽  
Author(s):  
A. M. Hamed ◽  
M. A. Saudy
Keyword(s):  
Glow Discharge ◽  
Electron Density ◽  
Electron Density Distribution ◽  
Discharge Plasma ◽  
Argon Plasma ◽  
Glow Discharge Plasma ◽  
Fringe Shift ◽  
Multiple Beam ◽  
Interference Fringes ◽  
Density Values

In this paper, a method of processing argon plasma images, obtained from the DC pseudo glow discharge technique, using two- and multiple-beam interference is suggested. This method is based on measuring the image fringe shift from the background interference fringes. Hence, this mapping of intensity shift is related to the electron density distribution of the argon plasma. Also, the refractive index of the plasma is computed from the electron density values. The contrast of the interferometer images in presence of plasma shift is investigated in both cases of two- and multiple-beam interference.

scholarly journals Increasing the Surface Energy and Sterilization of Nonwoven Fabrics by Exposure to a One Atmosphere Uniform Glow Discharge Plasma (OAUGDP)*

2001 ◽  
Vol os-10 (3) ◽  
pp. 1558925001OS-01 ◽  
Author(s):  
J. Reece Roth ◽  
Zhiyu Chen ◽  
Daniel M. Sherman ◽  
Fuat Karakaya ◽  
Peter P.-Y. Tsai ◽  
...  
Keyword(s):  
Glow Discharge ◽  
Surface Energy ◽  
Parallel Plate ◽  
Discharge Plasma ◽  
Plasma Reactor ◽  
Active Species ◽  
Glow Discharge Plasma ◽  
Commercial Application ◽  
Nonwoven Fabrics ◽  
Normal Glow Discharge

A technique for generating active species with the One Atmosphere Uniform Glow Discharge Plasma (OAUGDP) has been developed and used to sterilize and increase the surface energy, wettability and wickability of nonwoven fabrics. The OAUGDP is a non-thermal, fourth-state-of-matter plasma with the classical characteristics of a low pressure DC normal glow discharge that operates in air (and other gases) at atmospheric pressure. No vacuum system or batch processing is necessary, and a wide range of applications to fabrics and polymeric webs can be accommodated in a parallel plate plasma reactor. In addition to directly exposing webs and workpieces to active species for surface energy increase in a parallel-plate reactor, we have shown that active species capable of sterilization can be convected at near room temperature to a remote exposure chamber. This technology is simple, produces many effects that can be obtained in no other way, generates minimal pollutants or unwanted byproducts, and is suitable for online treatment of webs, films, and fabrics. Early exposures of nonwoven fabrics to the OAUGDP required minutes to produce relatively small increases of surface energy. These durations appeared too long for commercial application to fast-moving webs. Recent improvements in OAUGDP power density, plasma quality and impedance matching of the power supply to the parallel plate plasma reactor have made it possible to raise the surface energy of a variety of polymeric webs (PP, PET, PE, etc.) to levels in the range of 60 to 70 dynes/cm with one second of exposure. In most cases these high surface energies were not durable, and fell off to 50 dynes/cm after periods of weeks to months. Here, we report the exposure of nonwoven fabrics made of PP and PET at the UTK Textiles and Nonwovens Development Center (TANDEC) to an impedance matched parallel plate OAUGDP for durations ranging from one second to several tens of seconds. Data will be reported on the surface energy, wettability and wickability as functions of time of exposure, and of the aging effect after exposure. We will report the use of a OAUGDP with air as the working gas to sterilize a broad range of microorganisms on a variety of surfaces, and in several distinct applications. These include a Remote Exposure Reactor to sterilize large workpieces 20 centimeters or more from the plasma-generating region, and a sterilizable air filter.

scholarly journals Cleaning the surface of products with glow discharge plasma

2020 ◽  
Vol 1686 ◽  
pp. 012013
Author(s):  
V.N. Arustamov ◽  
R.KH. Ashurov ◽  
V.M. Rotchtein ◽  
KH.B. Ashurov ◽  
I.KH. Khudaykulov
Keyword(s):  
Glow Discharge ◽  
Discharge Plasma ◽  
Glow Discharge Plasma

Destruction of Renal Concretions with Electrolytic Glow Discharge Plasma

2021 ◽  
Author(s):  
S. Kh. Ali ◽  
Kh. M. Ali ◽  
E. A. Bezrukov ◽  
S. V. Belov ◽  
Yu. K. Danyleiko ◽  
...  
Keyword(s):  
Glow Discharge ◽  
Discharge Plasma ◽  
Glow Discharge Plasma

Enhanced thermionic emission of mayenite electride composites in an Ar glow discharge plasma

2021 ◽  
Author(s):  
Xiaochuan Tang ◽  
Adam E. Kuehster ◽  
Brodderic A. DeBoer ◽  
Alexander D. Preston ◽  
Kaka Ma
Keyword(s):  
Glow Discharge ◽  
Discharge Plasma ◽  
Thermionic Emission ◽  
Glow Discharge Plasma
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