Based On Giant Magneto-impedance Effect In Amorphous Wire Micro-magnetic Sensor Technology

Geophysics is an observational science. The dense observational manner with network, high flexibility has been the important means, which can achieve dense, real-time, plentiful data of physical geography. The sensor network with the characteristics of micromation , intelligentize, network and low power consumption would be new mode of the next age of the physical geography observation. So a plentiful of experiments had be done to the micromation sensor.In this paper, it is analyzed the theory of the Amorphous Wire Giant-Magneto-Impedance (AWGMI) effect and its influence factors in details, and expatiated the sensor principle based on AWGMI. On the basis of AWGMI, the experimental system of the micro-magnetic sensor is designed, which is composed of the detecting signals, processing and collecting data, display and transmitting data circuit and corresponding functional software etc.The properties of this kind of micro-magnetic sensor are studied by experiments, such as its linearity, sensitivity, frequency response, noise, stability and temperature properties and so on, especially analyzed the relation of the drive signals with all kinds of characteristics. The results show that there is no direct relationship between the frequency of the drive signals and linear property of the sensor. But with the increase of its frequency, some fluctuation appears on the characteristic curves; the direct relation is found between the frequency of the drive signal and sensitivity, with the increase of the frequency, AWGMI effect increases monotonously. It leads to the amplitude of the output voltage increase with the change of the outer magnetic field and results in the increase of the sensor sensitivity; it can be enhanced the corresponding rate of the sensor to the low frequency magnetic field by increasing the drive signal frequency. By experiments, the best...