The testing of wire ropes by magnetic flux leakage testing is common practice. This particularly applies to cable cars, lifts and cranes. Here, after the rope is exposed to a magnetic field the flaw stray fields are measured. The measurement is carried out e. g. by coils, wherein the movement of the cable through the coil (or vice versa) is assumed (that is, the coil must envelop the rope tightly), or by magnetic field sensors (e. g. hall sensors).
In the building industrie tension absorbing elements ropes of different design (diameter, surface coating) and bundling are applied. Therefore, test systems which have to envelop the rope are only used in rare situations and in a limited range of diameters. Moreover, in many cases, no exact location of the angular position of the flaw is possible.