Research On The High-Precision Detection Method Of Oil Pollutants Based On Principle

Ship hydraulic systems have a large number of applications in the marine industry,and about 80%of hydraulic system instability or failure is related to hydraulic oil contamination.Therefore,the detection of the main pollutants in the hydraulic oil can achieve the fault prediction and diagnosis of the hydraulic equipment,thereby prolonging the working life of the equipment and saving economic costs.For the metal particle contaminants in hydraulic oil,the commonly used spectral analysis method and the iron spectrum analysis method have the disadvantages of long time and professional operation,the ultrasonic detection method may cause secondary pollution to the oil,and the accumulation measurement method cannot distinguish Ferromagnetic and non-ferromagnetic metal particles.For water pollutants,the distillation method is inefficient,and the Karl Fischer method consumes a large amount of reagent and takes a lot of time,and the infrared spectroscopy is difficult to implement practical applications.And there are currently few excellent detection methods for bubble pollutants..In this paper,the traditional microfluidic oil contaminant detection sensor is combined with the resonance principle,and the resonant microfluidic sensor is designed to distinguish and detect various pollutants in oil.The main contents include:According to the detection principle of microcapacitance sensor and microinductive sensor,the two sensors are preliminarily designed,and the influence of excitation frequency on detection sensitivity is discussed and simulated.The structure optimization of the sensor is carried out by using COMSOL Multiphysics software.The micro-sensor is fabricated by molding method,then the detection system is built.The oil sample is configured according to the experiment.In the experiment,two micro-sensors were used to distinguish the iron particles and copper particles,water droplets and bubbles in the oil,verify the feasibility of the micro-sensor,and analyze the influence of the excitation frequency on the detection sensitivity of the micro-sensor through experimental data,and explore the lowest limit of detection of microsensorsThe experimental results show that the micro-inductance sensor can distinguish and count the ferromagnetic and non-ferromagnetic metal particles,and the micro-capacitance sensor can distinguish and count the water droplets and bubble particles.For the micro-inductance sensor,the detection effect is best when the excitation frequency is the resonance frequency and equal to 0.9 MHz.The lowest limit of detection for ferromagnetic metal particles is iron particles with a particle size of 20 ?m,and the lowest limit for detection of non-ferromagnetic metal particles is particle size.80?m copper particles;for the microcapacitance sensor,the detection effect is best when the excitation frequency is 0.6MHz,the lowest limit of detection for water is water droplets with a particle size of 100?m,and the lowest limit for detection of air is bubbles with a particle diameter of 180?m.Compared with the traditional particle counting sensor,the detection accuracy has been significantly improved,and high-precision detection has been realized.The research content of this paper has reference value for the development of portable multi-contaminant rapid discrimination detection and counting device in the future.