Electrical bridge apparatus for and method of measuring mechanical forces by magnetoelastic members

Claim 1

In apparatus for measuring mechanical forces with two measuring members of which one is capable of accepting a load and the other is not loadable, the members having magnetization windings which are arranged in a bridge circuit, the bridge having the two magnetization windings in first and second branches connected to each other at a first junction, the third and fourth branches having rectifiers therein, the bridge being fed with alternating current at the junctions beyond the ends of the series connected magnetization windings, the measuring voltage being taken off the bridge from the junctions between the first and second and beTween the third and fourth branches, the improvement comprising a combination of a series connected inductance and condenser connected in parallel with each of the respective magnetization windings, the resistances being such as to increase the output potential of the bridge, to decrease deviations from linearity, and to lower the creeping fault of the first measuring member caused by the magnetic viscosity of the measuring member, each of the series connected inductance and condenser combination comprising a series connected choke coil and a condenser, the third and fourth branches of the bridge circuit being each connected to the junction between the respective choke coil and condenser.