Simplified modeling of teledeltos paper

  • Thread starter Thread starter tempneff
  • Start date Start date
  • Tags Tags
    Modeling Paper
AI Thread Summary
The discussion focuses on creating a physics simulation to replicate the equipotential mapping experiment using teledeltos paper. Key considerations include the relationship between voltage and the electric field, with an emphasis on the material being resistive rather than semiconductive. Participants discuss assumptions for simulating the electrical field lines, such as using perfect conductors as equipotential boundaries and deciding between finite or infinite sheet models. Recommendations for relevant texts and resources are provided to assist with numerical procedures and electric field mapping. The simulation aims to be a low-fidelity educational tool for university students.
tempneff
Messages
82
Reaction score
3
TL;DR Summary
Trying to understand the assumptions behind the use of teledeltos paper to map electric fields
I'm writing a physics simulation to mimic the old equipotential mapping experiment like this one. I can't find much information on how the voltage across this semi-conducting sheet relates to the E-field. Before I start heading down the path sheet resistance and the resistivity of thin-film carbon, I thought I'd ask here.

What are the assumptions that I can make to represent the electrical field lines as voltages across teledeltos paper given a known source voltage and physical dimensions?
 
Engineering news on Phys.org
I believe the material is best described as resistive, not semiconductive.
You can assume that perfect conductors are equipotential boundary conditions.

You must decide if you are simulating a finite rectangular sheet, with infinite external resistance, or if you are simulating an infinite virtual sheet.

Will you employ a cartesian grid or a curved orthogonal grid.
Each cell will have a voltage, current magnitude and direction, giving 2D voltage gradient.

Do you have a text that demonstrates the numerical procedure on a cartesian grid ?
 
Last edited:
  • Like
Likes tempneff
Start here; Electromagnetics, by Kraus and Carver. See section 3.22
There is a copy here; https://www.qsl.net/va3iul/Files/Old_Radio_Frequency_Books.htm

For mapping electric fields, this book is well worth finding;
Analysis and Computation of Electric and Magnetic Field Problems. Second Edition. 1973.
By K. J. Binns and P. J. Lawrenson. Publisher; Pergamon Press.
ISBN 0-08-016638-5

Also;
Title; Electric Field Analysis. 2015.
By; Sivaji Chakravorti. Publisher; CRC Press.
ISBN-13: 978-1-4822-3337-7 (eBook - PDF)

ebooks or files.pdf can be found.
 
  • Like
Likes tempneff
Thanks @Baluncore, that is the oldest pdf I've seen in some time! I think my initial approach was complicating an easy problem. The lab assumes that the paper is lossless and that the charge distribution matches the electric field created by the electrodes. For the Point-source case (circular electrodes; simulated map voltages, real map voltages, and a simple kq/r calculation all agree. Why? That I'm not sure of.
 
I should have mentioned, that this is a low fidelity simulation for university undergraduates to play with online.
 
While I was rolling out a shielded cable, a though came to my mind - what happens to the current flow in the cable if there came a short between the wire and the shield in both ends of the cable? For simplicity, lets assume a 1-wire copper wire wrapped in an aluminum shield. The wire and the shield has the same cross section area. There are insulating material between them, and in both ends there is a short between them. My first thought, the total resistance of the cable would be reduced...
Hi all I have some confusion about piezoelectrical sensors combination. If i have three acoustic piezoelectrical sensors (with same receive sensitivity in dB ref V/1uPa) placed at specific distance, these sensors receive acoustic signal from a sound source placed at far field distance (Plane Wave) and from broadside. I receive output of these sensors through individual preamplifiers, add them through hardware like summer circuit adder or in software after digitization and in this way got an...
I am not an electrical engineering student, but a lowly apprentice electrician. I learn both on the job and also take classes for my apprenticeship. I recently wired my first transformer and I understand that the neutral and ground are bonded together in the transformer or in the service. What I don't understand is, if the neutral is a current carrying conductor, which is then bonded to the ground conductor, why does current only flow back to its source and not on the ground path...
Back
Top