Abstract
This paper proposed a new electromagnetic tomography (EMT) system based on tunnel magnetoResistance (TMR) for the detection of permeability, in which measured sensitivity is not affected by excitation frequency. In addition, we firstly put forward an improved simulation model, which has a similar distribution of magnetic field with real system. Afterwards, the perturbation method and the direct method were used to calculate the sensitivity matrices respectively, some simulation experiments were performed for reconstructing images and correlation coefficient between original images and reconstructed images based on different sensitivity matrices were calculated after that. The calculation shows that the sensitivity matrix calculated by the perturbation method is more accurate for detecting permeability in the new EMT system.
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