The Calculation Formula of Self-Inductance of a Single-Layer Rhombic Coil

Abstract

Recently, the usefulness of using parallelogram coil, has been reported in eddy current sensor or eddy current testing. This coil has the peculiar distribution of the magnetic field which can not be produced by a circular coil. Then, in this letter, the rhombic coil which is one of the parallelogram coils is taken up, and the singlelayer winding coil without hurting the accurate shape in the production, is noticed. And the exact calculation formula of the self-inductance of this coil is shown using the coefficient like Nagaoka's coefficient.