Trapezoidal wave excited sensitivity-variable time difference type magnetic flux gate sensor and data processing method

Abstract

The invention relates to a trapezoidal wave excited sensitivity-variable time difference type magnetic flux gate sensor and a data processing method. An FPGA (Field Programmable Gate Array), a D / A (Digital-to-Analog) conversion circuit, a V / I (Voltage-to-Current) conversion circuit, an excitation coil, a magnetic core, a frame, an induction coil, a matching resistor, an instrument amplifying circuit, a band-pass filter circuit, a hysteresis shaping circuit, a not-gate circuit and the FPGA are connected in turn to form the trapezoidal wave excited sensitivity-variable time difference type magnetic flux gate sensor. According to the trapezoidal wave excited sensitivity-variable time difference type magnetic flux gate sensor and the data processing method, a time difference type magnetic flux gate with the time difference of a positive pulse and a negative pulse which are output through the sensor as a detection method is stable in output response, high in sensitivity and low in power consumption; a circuit structure is simple, the performance of the response stability of the output time difference of the existing time difference type magnetic flux gate sensor is improved, the detection output accuracy is increased, and the measurement requirements of the actual target magnetic field are met; the data processing is performed through the FPGA and accordingly the speed is high, the resolution is high, and the signal frequency is controllable; time difference data are processed and accordingly the impact on signals of noise is reduced, the accuracy is improved, and the trapezoidal wave excited sensitivity-variable time difference type magnetic flux gate sensor and the data processing method are suitable for real-time dynamic magnetic field measurement of the magnetic flux gate; the process is simple and the digitization of the time difference type magnetic flux gate sensor can be achieved.

Description

Technical field: [0001] The present invention relates to a fluxgate sensor and a processing method for time difference data, especially a sensor that uses a controllable periodic trapezoidal wave as the excitation mode and measures a weak magnetic field through the time difference between the high and low levels of the output signal, and The time difference data processing method suitable for this kind of fluxgate. Background technique: [0002] Fluxgate sensor is an important method to measure the weak magnetic field. It is widely used in geophysics and has achieved a series of results. However, in recent years, fluxgate sensors that detect the measured magnetic field by means of even harmonics are subject to problems such as odd harmonic noise, bias, manufacturing process, and complex circuit structure, resulting in slow development of fluxgates. In order to make up for the above shortcomings and expand the research field of fluxgate sensors in my country, a variable sens...

AI Technical Summary

Problems solved by technology

The usual excitation magnetic field methods of time-difference fluxgate sensors are sine wave excitation and triangular wave excitation. Mutual constraints, that is, high stability and sensitivity will decrease, and high sensitivity and stability will decrease

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