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

Abstract:

Systems, devices, and methods for determining stress in a target are provided. The systems, devices, and methods facilitate detecting stress in the target using a sensor assembly. Using a sensor, taw stress signals, which can correspond to stress in the target, can be generated by detecting a magnetic flux that travels through the target. The raw stress signals can be sensitive to a gap between the sensor and the target. A proximity sensor element can be used to determine the size of the gap by generating an electric field between itself and the target. If the size of the gap changes, the strength of the electric field can change. Using a voltage 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 stress values within the target.