by Dr. Kartikeya Tripathi, Dr. David Yaney
October 20, 2010

This is a short derivation of the Rogowski equation written with my colleague Dr. Kartikeya Tripathi back in 2010. The first time a new user observes the remarkable properties of the Rogowski geometry (first published by Rogowski and Steinhaus in 1912) to create a current measuring aperture with a flat spatial response and also to reject stray magnetic fields form non-threading currents it looks magical. Like all things magical, it is not. However, if you take the time to understand how this thing works you will recognize the remarkably fortuitous nature of the structure. Dr. Tripathi and I often debated whether Rogowski was an unbridled genius or simply got lucky. My vote is, “observant and well-prepared.”

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