Experiment And Magnetic Field Analysis For Magnetostrictive Liquid Level Sensor Based On Ferrous Metal Material

With the rapid development of Chinese economic strength, the important position of liquid level measuring technology in industrial measurement is rising. magnetostrictive liquid level sensor has a wide range of applications due to high accuracy,contaction, large measuring range, high reliability, strong anti-jamming capability in the harsh environment. Magnetostrictive liquid level sensor is widely used in various fields of industrial measurement. Based on the magnetostrictive effect theory, the working principle of magnetostrictive liquid level sensor is introduced. On the basis of it, the magnetic field distribution of magnetostrictive liquid level sensor is analyzed. Through in-depth studying on the performance of liquid level sensor, we have provided the theoretical basis and the design of magnetostrictive liquid level sensor.First of all, the domestic and foreign development present situation and development prospect of the magnetostrictive liquid level sensor are introduced, at the same time, the advantages and disadvantages of the modern industrial level sensor used to do a comparison.Second, On the basis of the theory of magnetostrictive effect and its mechanism, the material property of magnetostrictive materials is introduced, the characteristics of iron nickel waveguide wire and the working principle of magnetostrictive liquid level sensor is analyzed deeply. Then according to the magnetic domain theory, analyzing the mechanism of the elastic waves, and introducing the magneto-elastic theory. According to the output that the characteristics of the equation and the waveguide wire magnetostrictive coefficient is proportional, the elastic modulus and the waveguide wire inversely is proportional. And with the increase of the number of turns and the effective cross-sectional area of the detection coil increases.Third, the application of the finite element software space magnetic field distribution of magnetostrictive liquid level sensor is analyzed. The circumferential magnetic field, the axial magnetic field and synthetic helical magnetic field distribution, magnetic induction density distribution has carried on the thorough analysis. The circumferential magnetic field strength increased along the waveguide wire radius increases, and reached the maximum value at the surface of the waveguide wire, and the pulse current is proportional. And on the basis of the activities of the float permanent magnet structure is optimized.Finally, setting up the experimental platform of magnetostrictive liquid level sensor, analyzing and comparing the influence factors of elastic wave signal. Elastic wave induction voltage replication increases with increase in detection of square wave pulse current, eventually become saturated, and with the increase of the detection coil number increases, also analyzed the pulse current frequency, pulse width, waveguide wire diameter effect on elastic wave signal and obtain the corresponding conclusion determine the best working point parameters, and further optimize the detection signal.The work of this paper can provide theory reference and laid the foundation for the design and research of high performance magnetostrictive liquid level sensor.