高通量微型多参数油液污染物检测传感器

为了缩短检测液压油污染物的相对时间、提升对固体污染物的检测精度。设计了一种内置玻璃管的高通量环形流道检测传感器,玻璃管内置一对硅钢片,聚合检测区磁场用以提升检测精度。流道穿过双层平面线圈内孔,通过改变平面线圈电路的连接方式,传感器可以切换两种不同的工作模式:电感检测和电容检测。电感检测可以区分铁磁性和非铁磁性固体颗粒,电容检测可以区分水滴和气泡。分别对电感检测和电容检测进行理论分析和实验验证,并且对有无硅钢片的电感检测进行仿真和实验对比。实验结果表明,环形流道设计缩短了检测时间,硅钢片的聚磁场效果可以提升对固体污染物的检测精度,铁磁性(铁颗粒)检测下限40μm,非铁磁性(铜颗粒)检测下限130μm,电容检测时,检测到200μm水滴和270μm气泡。该研究为实验液压油污染物快速区分检测提出了一种新方法。

High-throughput miniature multi-parameter oil contamination detection sensor

To shorten the relative time required for detecting hydraulic oil contaminants and improving detection accuracies of solid contaminants, a high-throughput annular flow channel sensor with a built-in glass tube was designed. A pair of silicon steel plates was embedded in the glass tube to polymerize the magnetic field in the detection zone to improve the detection accuracy. The flow path passed through the inner bore of the double planar coil. By changing the manner in which the planar coil connects to the circuit, the sensor can switch between two different modes of operation:inductance detection and capacitance detection. Inductance detection can distinguish between ferromagnetic and non-ferromagnetic solid particles. Capacitance detection can distinguish between droplets and bubbles. Theoretical analyses and experimental verifications of the inductance and capacitance detection were conducted, respectively, and the simulation and experimental comparison of the silicon steel sheets for inductance detection was performed. The experimental results show that the design of the annular flow channel shortens the detection time, and the effect of the magnetic field of the silicon steel plate can improve the detection accuracy of solid pollutants. The detection limit of ferromagnetic particles (iron particles) was found to be 40 μm, and the lower limit of detection of non-ferromagnetic particles (copper particles) was 130 μm. When capacitance was used for detection, 200 μm droplets and 270 μm bubbles were detected. This study thus proposes a new method for rapid differential detection of experimental hydraulic oil contaminants.