Rogowski coil [SEP] named after
Rogowski coil
A Rogowski coil, named after Walter Rogowski, is an electrical device for measuring alternating current (AC) or high-speed current pulses. It consists of a helical coil of wire with the lead from one end returning through the centre of the coil to the other end, so that both terminals are at the same end of the coil. The whole assembly is then wrapped around the straight conductor whose current is to be measured. There is no metal (iron) core. The winding density, the
it is demagnetized again.
Current sensor based on Faraday's Law Rogowski coil.
Rogowski coil is based on the principle of Faraday’s law of induction and the output voltage V of the Rogowski coil is determined by integrating the current I to be measured. It is given by, 
where A is the cross-sectional area of the coil N is the number of turns,
The Rogowski coil has a low sensitivity and is due to the absence of a high permeability magnetic core, that the current transformer can take