| 摘要 |
This application discloses an apparatus and electrical system for sensing the wear within an engine by detecting the presence of metal pieces which have become dislodged from the engine. The metal pieces are detected by collecting them upon a filter which is located generally within an inductor. The permeability of the inductor is measured as a function of the inductance, and the inductance becomes a measure of the number of particles collected by the filter.
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