# NTNUJAVA Virtual Physics LaboratoryEnjoy the fun of physics with simulations! Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/

## JDK1.0.2 simulations (1996-2001) => Electromagnetics => Topic started by: tommyers on June 17, 2006, 04:16:00 am

 Title: Parallel Plate Capacitor Fringing Post by: tommyers on June 17, 2006, 04:16:00 am Hi,I am experimenting with a simple Parallel Plate Capacitor arrangement in order to measure the dielectric of the material between the plates - air, 1 and polycarbonate, 2.9 at this stage. I would eventually like to further this technique to a fringing sensor arrangment, but first I need the following issues resolving.The plate separation is significant compared with the plate area i.e plate area, A = 1586mm^2 and the plate separation, d = 9.8mm. Using the elementary capacitor equation, C = (Eo x Er x A)/d does not include the fringing effect caused by such A/d ratio. Therefore my measurements are out with my calculations, in some cases by 40%.I would like a method of modelling the fringing effect so I may gauge the total capacitance in theory, and therefore the resulting dielectric, before carrying out the experiment.I have looked at many methods including the Boundary element method and such like. I would appretiate if someone could guide me through the modeling process either by example or recommendation of websites / texts / tutorials or books. Ultimately it would be nice to carry out such calculations and simulations using software so any recommendations using this would also be useful.I look forward to hearing your thoughts and comments.RegardsTom Myers Title: topic372 Post by: Fu-Kwun Hwang on June 19, 2006, 12:01:23 pm It can be simulated with numerical method: put laplace/posisson equstion into numerical form. You can check out standard textbook about numerical method. Title: topic372 Post by: tommyers on June 19, 2006, 03:31:51 pm Hi,Could you please be more specific and maybe provide examples or references to textbooks.RegardsTom Title: Re: Parallel Plate Capacitor Fringing Post by: EduZer on June 12, 2009, 10:07:14 am             Yeah can you give some examples or any reference textbook.,I really want to know it..,-*- Title: Re: Parallel Plate Capacitor Fringing Post by: Fu-Kwun Hwang on June 12, 2009, 02:21:07 pm For example:  Numerical recipes Home page at http://www.nr.com/