'Office of Scientific and Technical Information (OSTI)'
Doi
Abstract
The coolant-channel spacing between two flat fuel plates may be measured using an eddy-current induction coil. The range and sensitivity of these spacing measurements are functions of the coil geometry, the material surrounding the coil, and the operating frequency. Experimental curves are given showing how the coil impedance varies as a function of geometry, frequency, and the material surrounding the coil. A design problem is solved showing the compromises made between range and sensitivity which determine the coil geometry. The wire size and hence the proper number of turns are selected to match the coil to an alternating current bridge. Probe construction techniques are given to help the user construct both the coil and the apparatus to position the coil in the coolant channel. The necessary data for the design of spacing probes for many similar problems are given. (auth
