Temperature compensation and scalability of hysteretic/anhysteretic magnetic-property sensors

Non-destructive/noncontact stress sensors based on magnetoelastic principles have numerous applications for monitoring cable stress. However, their widespread use is hampered by problems related to temperature compensation and to scaling of calibration data to large cables, which is the domain of greatest interest. In this paper, experimental magnetic property and thermal response data are obtained and analyzed to address these problems. The magnetic property data include initial curves, major hysteresis loops, and anhysteresis curves, all obtained quasistatically. The thermal response data are presented in the form of a dimensionless correlation which is valid over a range of Reynolds numbers. Comparison of data indicates the feasibility of using absolute magnetic property measurements as the basis for direct calibration of large sensors.