Research on the influence of different microchannel position on the sensitivity of inductive sensor

Accurate detection of metallic wear debris is vital to avoid catastrophic failure of machine. An inductive metallic debris sensor in accordance with the theory of electromagnetism is presented to discuss the relationship between the sensitivity of inductive sensor and the position of microchannel inside the planar coil. Iron particles with 110-120μm in diameter are used in the experiment and the result demonstrate that the different position of microchannel does have influence on the sensitivity of planar coil. The sensitivity can be significantly improved when changing the position of microchannel, 130% increase in inductance amplitude could be got when the microchannel is near the edge of coil in contrast to near the center.