Abstract

The principle is based on capacitance measurements which are done by placing electrodes around the known dielectric medium which is made of PVC and the unknown dielectric specimen is put inside the cylinder. As we know, the capacitance detected will vary based on the area of the plates, distance between the plates and dielectric permittivity of the medium. Since area and distance of the plates are kept constant in this method, the variation in capacitance detected will be proportional to the dielectric permittivity of the medium placed inside the cylinder there by making this technique a suitable method for distinguishing substances of differing dielectric properties. This technique has got several advantages such as low cost, rapid response, high robustness and no radiation hazard. Till now it is used in Oil Industries for detecting bubbles in the oil flow based on the difference in their dielectric permittivities.

Paper Details