Research On Magnetostrictive Liquid Level Sensor And Analysis Of Its Influence Factors

With the rapid development of China's industrial civilization,domestic and foreign enterprises put forward new requirements on performance of the liquid level detection device,not only requiring a larger range of liquid level detection device,higher precision,longer working hours,but also requiring that the liquid level detection device in the case of poor working conditions can also work stably.So the research of magnetostrictive liquid level sensor is very necessary.This dissertation first of all introduces the research background and significance of magnetostrictive liquid level sensor.By comparing the research status of liquid level sensors at home and abroad and the common types of liquid level sensors,the advantages of the magnetostrictive liquid level sensor designed in this dissertation is illustrated.Then,according to the principle of magnetostrictive liquid level sensor and the theories of material mechanics,elastic mechanics and Faraday's law of electromagnetic induction,five factors influencing the detection voltage of magnetostrictive liquid level sensor are obtained,analyzed one by one.By means of experiment and theory,the parameters of material,excitation magnetic field,bias magnetic field,detection coil and damping device of the waveguide wire are determined and the theoretically optimal solution is obtained.In the analysis part of the bias magnetic field,finite element simulation software is used to simulate the different placement of the bias magnets.The theoretically optimal placement method is obtained,and the correctness of the theoretical analysis is verified by experiments.Finally,the filter circuit is designed and the experimental platform is set up to calibrate the effective range of the sensor and carry on the precision analysis.The influence of the change of liquid density on the detection precision and the method of correction are analyzed.The experimental results show that after optimization the magnetostrictive liquid level sensor meet the industrial requirements.The work in this paper provides a theoretical reference for the study of other high-performance sensors.