Elliptical three-coil sensor for realizing oil detection based on inductance method

The invention provides an elliptic three-coil sensor for realizing oil detection based on an inductance method, the elliptic three-coil sensor comprises an elliptic three-coil sensor and a circuit component, the elliptic three-coil sensor comprises an oil injection port, PDMS, a rectangular flow channel, a glass slide, an oil outlet, a first excitation coil, an induction coil and a second excitation coil; the circuit component comprises a three-coil oil liquid monitoring sensor circuit, a signal processing circuit and a data acquisition card; the first exciting coil and the second exciting coil are connected in parallel to a waveform generator with the voltage of Uin in a three-coil oil liquid monitoring and detecting sensor circuit; the induction coil is arranged between the first excitation coil and the second excitation coil, and two ends of the induction coil are connected with the signal conditioning circuit; the sensor is combined with a signal processing circuit, metal abrasive particles of different m