Research on Inductive Oil Contaminant Detection Sensor Based on High Gradient Magnetic Field Structure

doi:10.3901/JME.2022.23.098

Abstract

Abstract: Some contaminants will inevitably be introduced into the oil of machinery and equipment, and these contaminants will affect the normal operation of the equipment, especially metal abrasive particles. To a certain extent, the properties of abrasive particles reflect the wear status of the equipment. There are many methods for detecting abrasive particles, and the inductance detection method is widely used because of its simple structure. The accuracy of traditional inductance detection method is not high. In this study, a high-permeability permalloy with rectangular slots is attached to both sides of the detection coil, which can cause the magnetic field to concentrate in the sensing area. First, the magnetic field strength of different permalloy structures is analyzed by simulation. The results show that the magnetic field of the triangular slot structure is concentrated but not uniform, the rectangular opening slot has a higher magnetic field strength, and the magnetic field distribution is uniform and concentrated. Then according to the simulation results, relevant experiments are carried out. The results show that after adding permalloy with rectangular grooves, the signal-to-noise ratio(SNR) of ferromagnetic metal particle detection is increased by 20%, and the lower detection limit is increased to 30 μm; the SNR of non-ferromagnetic gold particles is increased by more than 70%, the detection offline is increased to 100 μm, and the detection accuracy of the sensor is significantly improved. This paper provides a high-precision inductance detection method to detect pollutants in oil, which is of great significance to the life diagnosis and health monitoring of the oil system.

Key words: high gradient magnetic field, oil analysis, wear particle detection, microfluidic chip

CLC Number:

TP212
TH73

BAI Chenzhao, WANG Chengjie, WANG Xiaotian, YU Shuang, ZHANG Hongpeng, LI Wei, SUN Yuqing, LI Guobin. Research on Inductive Oil Contaminant Detection Sensor Based on High Gradient Magnetic Field Structure[J]. Journal of Mechanical Engineering, 2022, 58(23): 98-105.

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