Giant magneto-impedance sensor device for detecting distance and signal processing method thereof

Abstract

The invention discloses a giant magneto-impedance sensor device for detecting a distance, and the device comprises an exciting circuit, a sensitive element, a pre-amplification circuit, a frequency-mixing filter circuit, a final-stage amplification circuit, an analog / digital conversion circuit, a feedback circuit and a microprocessor, noise and interference can be removed by extracting base frequency and harmonic components from signals so that the measuring precision of the sensor is improved; because a design scheme is easily integrated and the sensor is convenient to miniaturize, the device is improved in reliability and the production cost is reduced. The invention further discloses a signal processing method based on the giant magneto-impedance sensor device, a signal processing model is created by signal base frequency and harmonic components, and the signal feature of any object is measured such that the distance between the object and the sensor can be obtained through inversion calculation. Through the signal base frequency, the second harmonic components and the multi-feature signals, the device can avoid to only use a linear region, thus the measuring range of the sensor is greatly expanded when the measuring precision is improved.

Description

technical field [0001] The invention relates to a giant magneto-impedance sensor device and a signal processing method thereof, in particular to a giant magneto-impedance sensor device for distance detection and a signal processing method thereof. Background technique [0002] Magnetism is one of the inherent properties of objects. Magnetic sensors are widely used in signal recording, aerospace, mining, archaeology, intelligent transportation, space magnetic field detection, potential mine detection and other fields. Since the earth's magnetic field is ubiquitous, ferromagnetic objects placed in it will be magnetized by the earth's field to generate a magnetic field, and will not be affected by climate change. All kinds of large-scale equipment such as armored vehicles, aircraft, ships, and submarines will also be magnetized by the geomagnetic field and have a certain degree of magnetism. When these magnetic objects appear in a certain area, they cause changes in the surrou...

AI Technical Summary

Problems solved by technology

[0008] (1) The amplitude information of the fundamental frequency component of the sensor output signal is directly extracted through the hardware circuit, ignoring the signal harmonic component and other signal characteristics, which is not conducive to the improvement of measurement accuracy and the expansion of the measurement range;

[0009] (2) The focus of the design scheme is the hardware processing circuit, and the software algorithm is relatively simple, which limits its application in some occasions with high precision requirements and large dynamic range.

[0010] The above deficiencies limit the application of giant magnetoimpedance sensors in target detection

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