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Inductive measurement of metallic cylindrical shells

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3 Author(s)
Octavio, M. ; Instituto Venezolano de Investigaciones Científicas, Caracas, Venezuela ; Callarotti, Roberto C. ; Schmidt, Pierre E.

The thickness of thin cylindrical copper shells of radius a and thickness D(D/a < 0.15) were measured by means of an inductive measurement. The samples were obtained by chemical reduction of thick copper pipes. The conductivity of the cylinders was measured by a standard four-terminal technique. The agreement between the value of thickness measured mechanically and the value obtained from inductive measurement is of the order of ±2 percent. Thicker brass shells were measured and these results compared with theory. The extension of the inductive measurement to cylindrical shells covering cylinders with a finite conductivity is also discussed.

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Magnetics, IEEE Transactions on  (Volume:14 ,  Issue: 6 )