Characterization and control of the magnetic diffusion effect in a magnetostrictive position sensor.

In this paper, we investigate a magnetic diffusion field (MDF) within a guided wave wire, and analyze a one-to-one mapping between the MDF and the signal of a magnetostrictive position sensor (MPS). In order to control the MDF, two approaches—a magnetism absorption strap (MAS) and a magnetized MAS—are proposed. On the operation mechanisms of the two approaches, the similarity between the two methods is to establish a branch for the magnetic energy of the MDF. However, the difference between them is that the MAS relies on magnetic energy to be leaked and the magnetized MAS relies on the magnetic energy to be absorbed. The feasibility of the proposed concept and approaches has been verified by simulation and experiments. This work contributes to the theory of MPS by enriching the signal mechanism. Finally, it is suggested that the proposed approaches can be applied to develop new sensors for measurement of the micro-distance and the magnetic permittivity. [ABSTRACT FROM AUTHOR]