Editing Rogowski coil (section)

==Similar devices==
A device similar to the Rogowski coil was described by [[Arthur Prince Chattock]] of [[Bristol University]] in 1887.<ref>"On a magnetic potentiometer", ''Philosophical Magazine and Journal of Science'', vol. XXIV, no. 5th Series, pp.&nbsp;94&ndash;96, Jul-Dec 1887</ref> Chattock used it to measure [[magnetic field]]s rather than currents.  The definitive description was given by Walter Rogowski and W. Steinhaus in 1912.<ref>Walter Rogowski and W. Steinhaus in "Die Messung der magnetischen Spannung", ''Archiv für Elektrotechnik'', 1912, 1, Pt.4, pp.&nbsp;141–150.</ref>

More recently, low-cost current sensors based on the principle of a Rogowski coil have been developed.<ref>Patent for a planar Rogowski current sensor {{US patent|6414475}}, granted 2 Jul 2002.</ref> These sensors share the principles of a Rogowski coil, measuring the rate of change of current using a transformer with no magnetic core. The difference from the traditional Rogowski coil is that the sensor can be manufactured using a planar coil rather than a toroidal coil. In order to reject the influence of conductors outside the sensor's measurement region, these planar Rogowski current sensors use a concentric coil geometry instead of a toroidal geometry to limit the response to external fields. The main advantage of the planar Rogowski current sensor is that the coil winding precision that is a requirement for accuracy can be achieved using low-cost [[printed circuit board]] manufacturing.