Trapezoidal wave excited sensitivity-variable time difference type magnetic flux gate sensor and data processing method
A fluxgate sensor, time difference technology, applied in the magnetic field measurement, the size/direction of the magnetic field, etc. using the principle of magnetic flux control, can solve the problems of reduced sensitivity and stability, and achieve the advantages of digitization, low power consumption, and circuit structure. simple effect
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Embodiment 1
[0061] The FPGA logic signal processor 12 controls the digital signal generating the trapezoidal wave. After passing through the D / A conversion circuit 1, the V / I conversion circuit 2 forms a trapezoidal wave periodic excitation signal generating device, and the excitation signal generating device generates a periodic trapezoidal wave current signal. It acts on the excitation coil of the time-difference fluxgate probe. The skeleton of the time-difference fluxgate probe is made of a double-layer half-glass plate, with an aspect ratio of 10:1, a thickness of 50μm, and a maximum permeability of greater than 10 6 Gs / Oe cobalt-based amorphous material is used as the magnetic core, and the excitation coil and induction coil are wound on it. The turns ratio of the excitation coil and the induction coil is 1:10, and the outside of the skeleton is sealed and wrapped by copper and aluminum. The structural shielding layer, the excitation coil, the induction coil and the ground wire conne...
Embodiment 2
[0074] The FPGA logic signal processor 12 controls the digital signal generating the trapezoidal wave. After passing through the D / A conversion circuit 1, the V / I conversion circuit 2 forms a trapezoidal wave periodic excitation signal generating device, and the excitation signal generating device generates a periodic trapezoidal wave current signal. It acts on the excitation coil of the time-difference fluxgate probe. The skeleton of the time-difference fluxgate probe is made of hollow cylindrical plastic, with an aspect ratio of 50:1, a thickness of 50μm, and a maximum permeability greater than 10 6 The Gs / Oe cobalt-based amorphous material is used as the magnetic core, and the excitation coil and the induction coil are wound on it. The turn ratio of the excitation coil and the induction coil is 1:5, and the outside of the skeleton is sealed and wrapped by copper and aluminum. The structural shielding layer, the excitation coil, the induction coil and the ground wire connecte...
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