Research On High Sensitivity Microfluidic Chip For The Detection Of Solid Particles In Hydraulic Oil

In today’s industry,machinery maintenance is essential since equipment failure or breakdown is unavoidable without appropriate maintenance.For essential machinery,breakdown maintenance is not cost-effective and preventive maintenance based on time might be costly.Therefore,a practical and affordable maintenance plan for machinery is required.The most frequent type of failure is wear,which is brought on by the contact of mechanical components and results in either adhesive or abrasive wear.In mechanical systems,contaminated oil may accelerate equipment failure by accelerating wear.Improving the sensitivity of oil detection sensors is crucial for detecting microparticles,and oil monitoring are crucial for avoiding and diagnosing mechanical faults.This thesis examines multiple techniques used to prevent system failure by carefully observing the state of the oil.However,several of these techniques have drawbacks,such as poor sensitivity,which may reduce their effectiveness.In order to get over these restrictions,an extremely sensitive sensor is introduced in this thesis.The sensor comprises single-layer coils with FINEMET attached to the coil.Since FINEMET has strong magnetic permeability,susceptibility,and low core losses,It helps to boost the sensitivity of the sensor.Using an inductance and resistance signal,this system can identify magnetic and non-magnetic particles.Non-ferromagnetic metal particles may be detected and distinguished by the inductance signal,but the resistance signal can only detect but cannot distinguish between the metal particles.An experiment comparing sensors with and without FINEMET demonstrates that the FINEMET improves the magnetization and eddy current effect in both the inductance and resistance signal.Consequently,this demonstrates that the sensor with FINEMET has a higher sensitivity than the sensor without.The experimental result shows that the sensor without FINEMET could not identify iron particles smaller than 40 μm and copper particles smaller than 76 μm with the use of an inductance signal.However,the sensor with FINEMET can detect copper and iron particles as small as 60 μm and 19 μm,respectively.The sensor with and without FINEMET could not detect any of the iron particles used in this experiment when using a resistance signal.Nevertheless,the sensor without FINEMET was able to identify copper particles as tiny as 55 μm when using a resistance signal,while the sensor with FINEMET was also able to detect as small as 45 μm using the resistance signal.This study shows that the use of FINEMET increases sensor sensitivity,and the sensor employed in this study has the potential to be used for machine condition monitoring and hydraulic system diagnosis.