Detection of Paint Curing by Surface Potential of Painted Layer Charged by Corona Discharge

2014 ◽  
Vol 50 (6) ◽  
pp. 4239-4244
Author(s):  
Toshiyuki Sugimoto ◽  
Kohei Yamaguchi ◽  
Yoshio Higashiyama ◽  
Nobuo Nomura
Keyword(s):  
Corona Discharge ◽  
Surface Potential ◽  
Painted Layer

HIGH PRECISION SIMULATION ON SURFACE POTENTIAL OF CELLULAR ELECTRETS BY CHARGE SIMULATION METHOD

2019 ◽  
Vol 26 (01) ◽  
pp. 1850133
Author(s):  
J. W. ZHANG ◽  
X. CHEN ◽  
Y. S. ZHAO ◽  
Z. Y. SU ◽  
R. T. LIU
Keyword(s):  
Corona Discharge ◽  
High Precision ◽  
Surface Potential ◽  
Simulation Method ◽  
Charge Storage ◽  
Charge Simulation Method ◽  
Storage Performance ◽  
Simulation Based ◽  
Electrostatic Generator ◽  
Storage Ability

Surface potential is one of the key properties of charge retain ability and energy storage performance of cellular electrets. Based on charge simulation method (CSM), a high precision simulation algorithm of surface potential of functional dielectrics is proposed in this paper, which can be applied to the simulations of cellular polypropylene after high-voltage corona discharge. In order to validate the modeling, the surface potential of insulating polymer after corona discharge is measured by an electrostatic measurement system and compared with simulation results based on CSM and finite element method (FEM). The result shows that the numerical simulation based on CSM is well consistent with the experimental data, which indicates that the modeling based on CSM can be used in the calculation and analysis of charge storage ability of capacitor and electrostatic generator based on functional electrets. Moreover, as simulation based on CSM has higher precision than FEM, investigation of surface charge storage ability and prediction of electrostatic hazards of insulating dielectrics could be realized by using CSM.

Using the Surface Potential Decay Method to probe electrical conduction in epoxy resins used for packaging

2001 ◽  
Vol 682 ◽  
Author(s):  
Alain Sylvestre ◽  
Patrice Gonon ◽  
Jérôme Teysseyre ◽  
Christophe Prior
Keyword(s):  
Relative Humidity ◽  
Corona Discharge ◽  
Surface Potential ◽  
Electrical Conduction ◽  
Physical Interpretation ◽  
Epoxy Resins ◽  
Room Temperature ◽  
Electrostatic Charges ◽  
Charge Decay ◽  
Potential Decay

ABSTRACTIn this work we discuss the usefulness of the Surface Potential Decay (SPD) method to investigate electrostatic charges deposited on epoxy resins which are used for electronic packaging. Corona discharges were applied on epoxy resins with different degrees of Post Mold Curing (PMC). SPD studies were conducted at room temperature under a relative humidity of about 45%. In the first part of this study we analyze the flow of electrostatic charges as a function of time. Using the SPD method we evidence that 10% of the electrical charge is still present at the surface three hours after the corona discharge has been applied. We find that the surface potential decay is more important for samples with longer PMC duration. In the second part of this work we provide a physical interpretation of the surface charge decay. We suggest that it is related to polarization mechanisms within the bulk of the material.

The effects of surface absorbed monolayer microdiffraction patterns

1988 ◽  
Vol 46 ◽  
pp. 680-681
Author(s):  
M. Pan ◽  
J.M. Cowley
Keyword(s):  
Surface Potential ◽  
Electron Probe ◽  
Potential Distribution ◽  
Crystal Surface ◽  
Normal Direction ◽  
Surface Image ◽  
Extended Surface ◽  
Gas Molecules ◽  
Surface Nature ◽  
Electron Microdiffraction

Electron microdiffraction patterns, obtained when a small electron probe with diameter of 10-15 Å is directed to run parallel to and outside a flat crystal surface, are sensitive to the surface nature of the crystals. Dynamical diffraction calculations have shown that most of the experimental observations for a flat (100) face of a MgO crystal, such as the streaking of the central spot in the surface normal direction and (100)-type forbidden reflections etc., could be explained satisfactorily by assuming a modified image potential field outside the crystal surface. However the origin of this extended surface potential remains uncertain. A theoretical analysis by Howie et al suggests that the surface image potential should have a form different from above-mentioned image potential and also be smaller by several orders of magnitude. Nevertheless the surface potential distribution may in practice be modified in various ways, such as by the adsorption of a monolayer of gas molecules.

Modeling on Effects of Charging Time and Recombination on Surface Potential Decay Crossover of LDPE

2016 ◽  
Vol 136 (2) ◽  
pp. 86-92 ◽  
Author(s):  
Daomin Min ◽  
Shengtao Li ◽  
Guochang Li ◽  
George Chen
Keyword(s):  
Surface Potential ◽  
Charging Time ◽  
Potential Decay
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