Title:

Damping and Maximizing Output Signal of Rogowski Coil with Flux Feedback System

The Rogowski Coil is a highly permeable toroidal core wound with copper wire, and will be used to measure AC current in Earth's upper ionosphere with the goal of better understanding the current systems shared between the ionosphere and the magnetosphere. Using numerical simulations to model frequency characteristics of the Rogowski coil, a natural frequency of the system is shown to exist within the frequency range of interest for this mission. External electrical components must be appended to appropriately damp the system at the resonance frequency so that the output signal is evenly weighted and contains as little distortion as possible. In this project, two damping models are considered. The first is the addition of a damping resistor placed in parallel with the Rogowski Coil. The second includes a flux feedback amplifier and secondary feedback winding which travels in the opposite direction of the main coil winding. The flux feedback model is shown to preserve the original signal of interest better and will be implemented in the final Rogowski Coil system.

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