Research on a High Sensitivity Hydraulic Oil Contaminant Detection Sensor

doi:10.3901/JME.2023.08.042

Abstract

Abstract: Oil contamination has a great influence on the stable operation of the machine, and the sensitivity of the existing oil contamination detection sensor needs to be improved. Therefore, an oil contaminant detection sensor with permalloy wrapped detection coil is proposed, in which the detection coil is composed of two planar coils in positive series. After the permalloy wrapped the coil, the magnetic field at the center of the induction region can be enhanced by 2.43 times, and the signal-to-noise ratio can be increased by more than 2.00 times in the detection of metal particles. The mutual inductance effect of the coil can enhance the magnetic field at the center of the induction region by 2.00 times, and increase the signal-to-noise ratio of the metal particles by more than 2.00 times. In inductance detection mode, the sensor can distinguish between iron particles of 10-15 μm and copper particles of 65-70 μm. In capacitive detection mode, the sensor can distinguish between water droplets of 70-80 μm and air bubbles of 180-190μm, and the detection limit is significantly improved. The detection sensitivity of the designed sensor has been greatly improved,which provides technical support for online monitoring of oil, and can be used as a sensing element for monitoring the health status of mechanical equipment.

Key words: double plane coil, coil mutual inductance, abrasive particle detection, microfluidic chip

CLC Number:

TP212

WANG Cheng-jie, YU Shuang, BAI Chen-chao, YANG Chao-xu, ZHANG Hong-peng, WANG Shuai, SUN Yu-qing, LI Guo-bin. Research on a High Sensitivity Hydraulic Oil Contaminant Detection Sensor[J]. Journal of Mechanical Engineering, 2023, 59(8): 42-49.

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