Detection Circuit Design of Three-Coil Inductive Particle Sensor

The particles in lubricating oil reflect a lot of information of Mechanical operation Status,so the particle detection has a very important engineering application.Design a three-coil inductive particle monitoring sensor,according to the coupling relation between particle in lubricating oil and the induction coil.Basing on the sensor measurement principle,the detection circuits include drive circuit of amplitude and phase adjustment,pre-amplifier,precision rectifier circuit and the second stage filter amplifier circuit.The results show that:the detection circuits combine with the follow-up signal acquisition module and the LabVIEW NI data processing,the detection resolution of ferromagnetic abrasive reaches 100 μm.