Influence of Rogowski coil structure for sub-ns current pulses

Short current pulses are very diffuse and have also been used in many electronic devices for biological stress recently. In order to measure these current pulses, Rogowski coils are applied. In this work, we focus our efforts on the structure of the Rogowski box, which has a narrow slit, needed to correctly lead the current to be diagnosed. The attenuation coefficient depends mainly on the inductance values, the load resistance, and the virtual capacitance between coil and ground. Until now, the influence of the slit length and its width was never considered. We have studied, either theoretically or experimentally, the influence of the slit dimensions on calibration factor variations. The attenuation factor ranged from 11.3 to 16.3 A/V for s ranging from 0.8 to 0.2 mm, respectively. The device we realized is able to perform precise measurements of sub-nanosecond rise time pulses (∼100 ps).