Planar magnetic field scanning and imaging system based on Hall sensor

Abstract

The invention discloses a planar magnetic field scanning and imaging system based on a Hall sensor. The planar magnetic field scanning and imaging system comprises a three-dimensional mechanical displacement platform, a lower computer controller based on STM32, a Hall sensor, a differential amplification circuit module, a data acquisition card, upper computer control and data analyzing and processing software and a constant flow source, wherein a component to be tested is connected with the constant flow source and is arranged on a sample piece table of the three-dimensional mechanical displacement platform; the three-dimensional mechanical displacement platform and the Hall sensor are started, and then the motion parameters of the displacement platform are set according to the size of a sample piece; scanning type acquisition is carried out on the amplitude of the magnetic field on the surface of a measured conductor by the displacement platform which is started, together with the Hall sensor; the magnetic field information acquired by the sensor is sent to an upper computer by the data acquisition card; the scanned image of the magnetic field distribution on the surface of the sample piece to be tested can be displayed by the upper computer. The planar magnetic field scanning and imaging system can be used for scanning and imaging the magnetic field distribution condition of the surface of electrified material, so that the internal structure of the material is further analyzed according to the magnetic field distribution; therefore, the system has a certain practical value for detecting the integrity condition in the material in a nondestructive way.

Description

technical field [0001] The invention relates to the field of electromagnetic non-destructive testing, specifically, a detection system for scanning the magnetic field on the surface of an electrified material, and then analyzing the internal structure of the sample to be tested. Background technique [0002] With the continuous development of the machinery manufacturing industry, metal materials have been vividly reflected in both industrial applications and special applications, and more and more complex and more precise structures have been widely used. This kind of high-precision and high-complexity mechanical structure plays a pivotal role in the development of the country's industry and even the development of the national economy. However, with the increase of service time of some mechanical parts, certain safety hazards will inevitably appear on the surface or inside. [0003] The rapid development of nondestructive testing technology in recent years has solved this ...

AI Technical Summary

Problems solved by technology

The whole process needs to constantly move the Hall sensor, and it is necessary to ensure the consistency between the sensor measurement information and the corresponding position information. Due to the uncertainty of human movement, it will cause the magnetic field information collected by the sensor and the corresponding position information to be inconsistent during the movement process. Inconsistent, resulting in invalid magnetic field information collected

This puts higher requirements on the dynamic acquisition process of the Hall sensor. During the detection process, it is necessary to continuously collect the magnetic field information at a certain position, and ensure that the magnetic field information is consistent with the position on the final drawn magnetic field cloud map. Manual scanning acquisition This method leads to a large measurement error

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