Abstract
The uneven radial magnetic field distribution in the planar coil will lead to debris detection errors, especially for inductive debris sensors with high throughput and sensitivity, so the effect of debris position on the detection sensitivity should be addressed. In this study, based on spatial magnetic field analysis of planar coil, the characteristics of impedance signals induced by debris at different positions in planar coil were investigated under different frequencies, debris sizes and velocities. The experimental results demonstrated that the double peaks generated in the induced signals can be eliminated without sacrificing the sensitivity by placing the sensor channel at the coil inner wall, and the sensitivity can be improved by observing resistance signals, increasing the frequencies and reducing debris velocities.
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