AN ANALYSIS OF CHARGED FLOOR POTENTIAL USING ELECTROMAGNETIC-FIELD THEORY

The transient electromagnetic wave generated by electrostatic discharg e (ESD) has a spectrum of wide frequency range and causes unpredictabl e errors in the operation of highly technical electronic apparatus, po sing serious problems in our high information society. The charging of a walking body is assumed to be one main cause of ESD, and the use of a floor material of low electric resistance is recommended, but its e ffects are not as yet clearly understood. We have proposed a model of the mechanism of decay of charged potential of the human body on the f looring materials, and the validity of the model has been proved exper imentally. But in the theory, the electrostatic capacity is introduced a priori between the flooring materials and iron reinforcing bar that is the reference of an electric potential. The electrostatic capacity is the quantity defined by the potential and electric charge of the c onductor and not defined between the insulators, such as flooring mate rial and conductors. On the other hand, in his book Murasaki insists o n the necessity of the electrostatic capacity between the charged insu lator and conductor as an ''imaginary quantity'' far understanding ele ctrostatic damage, but this is not sup ported by electromagnetic theor y. In this paper, the coincidence of the former result from electric c ircuit analysis and our new result from electromagnetic field theoreti c analysis supports the correctness of the ''imaginary quantity'' of t he electrostatic capacity to the flooring materials. (C) 1998 Scripta Technica.