Theoretical And Experimental Study On Magnetic Fluid Accelerometer

Magnetic fluid is a new type functional material which is both magnetic and liquid, and it's the only super-paramagnetic material at room temperature. Magnetic fluid accelerometer is an application of magnetic fluid's self-levitation theory, and its structure is simple and reliable. With the advantage of detecting low frequency acceleration, magnetic fluid accelerometer could be widely used in military and aerospace area.The main work of this thesis is as follow:(1) Magnetic fluid's self-levitation is analyzed; Dependence of levitation on dimension of magnets and accelerometer's shell, volume and saturation magnetization of magnetic fluid are given out by experiments which show the main factors that influence levitation force are the dimension of magnets and the volume of magnetic fluid.(2) The influence of the two factors on the sensor is given out.(3) The structure of accelerometer is designed by conclusion of experiments.(4) The frequency of exciting signal is given out by experiment. Finally, the circuit of sensor is designed.(5) The sensor is tested which show the sensor's sensitivity is 15.3 V/g.Dependence of the self-levitation force on several factors are given out, the structure and circuit of accelerometer are designed and the accelerometer is tested. It's a good foundation for next work.