Design of the oil detection microfluidic chip

Wear debris in hydraulic oil causes faults of hydraulic system mostly and it is also an important mechanical fault information carrier, so it is crucial to check the wear debris in hydraulic oil. Based on inductance measurement principle and microfluidic chip technology, an oil detection microfluidic chip was designed. The proposed chip has the advantage that in theory the distance between wear debris in oil and the embedded planar inductance coil is 0, which greatly improves the sensitivity of the detection device. With numerical simulation and experiment, the relation between the coil geometry parameters and inductance change of planar inductor coil is analyzed. The result indicates that when the ferrous metal particles go through the detection channel, the measured inductance change increases with the number of coil turns and decreases with the coil line width. This study provides a very good research scheme for oil metal particle detection.