Controlling Rogowski Sensor Frequency Response Through Integrator Design
by Gregory Mirsky, Design Engineer, Deer Park, Ill., How2Power Today, Oct 15 2025
Focus:
In a previous article series, the operation of the Rogowski coil was analyzed and
equations were derived for designing both the coil and integrator to create a complete
Rogowski sensor. The purpose was to allow designers to obtain benefits of Rogowski
sensors such as wide current range at a much lower cost than off-the-shelf instrument-
grade Rogowski sensors, while only making small sacrifices in sensor accuracy. This
article carries the discussion further by explaining how to tailor the frequency
bandwidth of the Rogowski sensor to a particular application through adjustment of the
integrator design. This part also draws on some of the analysis performed in the recent
series on integrators.
What you’ll learn:
- How to adjust the frequency response/bandwidth of a Rogowski sensor design
- How to derive the transfer functions of a Rogowski coil and its integrator
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