Magnetic Field Measurement Instrument Based on Asymmetric Giant Magneto-Impedance Effect.

A magnetic field measurement instrument based on asymmetric giant magneto-impedance effect is developed by using Co66.3Fe3.7Si12B18 amorphous ribbon. The signal processing circuit of the sensor and the hardware circuit of the measurement instrument are designed, and the experiment result is given. The result shows that this instrument can measure the weak magnetic field ranging from -260 to + 260 A/m. The sensitivity is 0.01 A/m and measurement accuracy is +/- 0.55% because of applying sensor nonlinear compensation technique through microcontroller. The instrument has high sensitivity, high repeatability, high frequency response characteristic, which is widely used in aerospace, aviation, national defense and other fields.