A Bridge-Type Inductance Sensor With a Two-Stage Filter Circuit for High-Precision Detection of Metal Debris in the Oil

A bridge-type inductance sensor with a two-stage filter circuit for high-precision detection of metal debris in the oil is proposed. The sensor mainly consists of a bridge-structure sensing unit and a two-stage filter circuit. The sensing unit consists of two double-wire solenoid coils (as the detection unit and the reference unit, respectively) and a Wheatstone bridge -structure. This structure e...