Radial induction type three-coil oil metal particle sensor and detection method

The invention provides a radial induction type three-coil oil metal particle sensor and a detection method, the sensor comprises a flow channel inlet, an oil flow channel, a sensing unit and a flow channel outlet, the flow channel inlet is communicated with an opening at one end of the oil flow channel, and an opening at the other end of the oil flow channel is communicated with the flow channel outlet; the sensing unit comprises a first excitation coil, a second excitation coil and an induction coil; the induction coil is arranged on the outer wall of the oil liquid flow channel in a tightly attached and surrounding mode. The first excitation coil and the second excitation coil are symmetrically attached to the two sides of the induction coil respectively. The exciting coils in the sensing unit are arranged on the two sides of the induction coil and the oil liquid flow channel, the magnetic field generated by the exciting coils is perpendicular to the flow channel direction, the special coil arrangement stru