General Electric Company
Non-contact magnetostrictive sensor with gap compensation field

Abstract:

Systems, devices, and methods for determining stress in a conductive target are provided. The systems, devices, and methods facilitate detecting stress in the target using a sensor assembly. Raw stress signals, which can correspond to stress in the target, can be generated by detecting a first magnetic flux that travels through the target. The raw stress signals can be sensitive to a gap between the sensor assembly and the target. A proximity sensor element can be used to determine the size of the gap by generating a magnetic field which can couple with the target. If the size of the gap changes, the coupling can change. By determining an impedance of the proximity sensor element, a corresponding gap signal can be generated. The gap signal can be used to correct the raw stress signals, thereby creating corrected stress signals, which can correspond to values of stress within the target.