The measurement system for a permittivity distribution has been investigated based on the measured capacitance using long distance measurement electrodes with a shield and additional electrodes. However, it has not been established to measure the permittivity distribution yet. We have compared the measured capacitance with numerical results using the experiment system with an acrylic rod. In the paper, we will discuss the capacitance variation based on the electric field deviation and verify a feasibility of the estimation method for the dielectric location using a pair of long distance parallel electrodes with additional electrodes.
SUMMARYWe have investigated the estimation of the location of a dielectric from the capacitance measured with widely spaced measurement electrodes provided with a shield and additional electrodes. In order to investigate the estimation method, a numerical technique was developed for calculating the capacitance between widely spaced measurement electrodes by finite element analysis. We discuss the new method for estimation of the locations of two dielectrics by using a capacitor with widely spaced parallel electrodes and additional electrodes.