一种高灵敏度液压油污染物检测传感器研究

Research on a High Sensitivity Hydraulic Oil Contaminant Detection Sensor

油液污染物对机械装置的稳定运行有很大的影响,而现有的油液污染物检测传感器灵敏度还有待提高。为此,提出一种坡莫合金包裹检测线圈结构的油液污染物检测传感器,其中检测线圈由两个平面线圈正向串联组成。坡莫合金包裹线圈之后,感应区域中心位置磁场可以增强2.43倍,检测金属颗粒时信噪比提高了2.00倍以上;线圈的互感效应可以使感应区域中心位置的磁场增强2.00倍,使检测金属颗粒时的信噪比提高了2.00倍以上。电感检测模式下该传感器可以对10~15μm的铁颗粒和65~70μm的铜颗粒进行区分检测;在电容检测模式下该传感器可以对70~80μm的液滴和180~190μm的气泡进行区分检测,检测极限显著提高。设计的传感器检测灵敏度得到极大提高,为油液在线监测提供了技术支持,可以作为机械设备健康状态监测的传感元件。

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 10-15μm and copper particles of 65-70μm.In capacitive detection mode,the sensor can distinguish between water droplets of 70-80μm 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.