Superminiature Eddy-current Transducers for Thickness Studies

On the basis of the transformer type eddy-current transducer we created a measuring system which allows us to estimate the possibility of the eddy-current method application to measure the thickness of the conductive and dielectric coatings placed on the conductive base. We described the structure of the measuring system and the measurement procedure. A scheme that uses a computer as a generator and receiver of signals from windings is proposed. The article contains the data demonstrating the dependency of the amplitude part of the signal on the objects of different thickness and states the objects' experimentally determined limits of the size that precondition the practicability of these measurements. (paper)