The Study The Preferred Magnetization Direction of Long Line Magnetostrictive Position Sensor

The long liner position sensor is a kind of position sensor that can measure the distance between the detected point and the receiving point by calculating the duration of the excitation and the receipt of ultrasonic waves. In our experiment, the unsymmetrical phenomenon of elastic waves was detected under different initial condition with the symmetrical sensor system, due to the anisotropy of magnetic domain, which may be anisotropy of crystal axis, stress and shape. This paper recorded and analyzed the data of experiment. The theory of unsymmetrical of long liner position sensor was discussed in ferromagnetic, electromagnetic and physics. The effecting factor of the physic unsymmetrical of magnetostrictive material was studied in this paper, and the mathematic model was constructed.