Research On Detection Mechanism Of A High-precision Oil Microsensor Embedded With Nanoparticles

With the development of mechatronics,high speed and intelligence of modern machinery and equipment,the hydraulic system components in the shipbuilding industry are widely used and increasingly sophisticated.However,there is a common problem that the serious impact of working medium pollution on the working performance and service life of the ship's hydraulic system is more and more serious.Therefore,the operating status and fault information of the marine equipment can be obtained by detecting the working medium,which is very important for ship maintenance.Based on the integration trend of the inductance and capacitance detection in the early stage of the project,this paper enriches the spiral micro-inductor detection function,it also realizes the high-precision distinguishing detection of multiple pollutants in the marine engine oil.The main research contents include:preliminary design of a single solenoid coil based on the principle of multi-parameter impedance detection,enriching the detection function by optimizing the structure;using COMSOL Multiphysics to simulate the principle,and manufacturing the initial sensor and testing system by molding method Build;optimize the detection performance by adding magnetic nanoparticles and resonant structures of appropriate particle size and concentration;finally,the feasibility and lower limit of detection of micro-sensors were verified through the differential detection of ferromagnetic metal particles,non-ferromagnetic metal particles,and two types of non-metal particles such as water droplets and bubbles.The conclusion obtained through experimental investigation and data analysis is that the microsensor designed in this paper can distinguish and detect the above four kinds of pollutant particles in the oil,and the detection performance of the sensor is improved by adding a magnetic nano-coating with a particle size of 10 nm and a concentration of 70%and a resonant structure composed of a 153 ?F chip capacitor.The lower detection limit measured in the experiment is:for the inductance detection mode,when the excitation frequency is set to 1.0 MHz,the detection limit of the ferromagnetic metal particles is 25?m.And when the excitation frequency is set to 1.1 MHz,the lower limit of detection for non-ferromagnetic metal particles is 90?m.For the capacitive mode,when the excitation frequency is set to 0.5 MHz,the lower limit of detection for water by the microsensor is 120 ?m.And the lower detection limit of gas is 175?m.For the use of a ring-shaped micro-channel,the detection volume per unit time increased by 8 times.