When a short and high current pulse is supplied to an electric conductor, due to magnetic diffusion the current distributes inhomogeneous over cross section of the conductor. In rails of the Railgun, the skin and proximity effect leads to current concentration at the inner surface of the rail. Consequently, the current conducted by the rails does not use total available cross-section which results in higher rail resistance, increased current density, increased ohmic heating and reduced efficiency. It also has considerable influence on the inductance gradient of the Railgun.
Pulsed magnetic field measurements with CMR B-scalar sensors connected in BeScal magnetic sensor system have been performed in static and dynamic Railgun tests.The results have reveled more information than was possible to obtain from theoretical simulations.
The experiments have also shown, that CMR technology can be applied in harsh experimental environment and open possibilities to measure Velocity Skin Effect.