磁気異方性センサの出力電圧‐励振周波数特性

Abstract

The magnetic anisotropy sensor (MAS) is a stress sensor that detects internal stresses induced by the inverse magnetostrictive effect. In this study, the sample is a cold rolled steel plate used for a car body. Because the penetration depth of flux is greater than the thickness of the sample, 0.75 [mm], the MAS detects the average of the internal stress distribution Therefore, the output voltage is affected by the internal stress distribution. The flux density distribution in the sample caused by the skin effect is varied with the excitation frequency. This paper shows that the internal stress distribution can be estimated from the output voltage-excitation frequency characteristics.