Scanning nondestructive testing system and method based on weak magnetic sensor

Abstract

The invention provides a scanning nondestructive testing system and method based on a weak magnetic sensor and belongs to the field of nondestructive testing. The method comprises the following steps:carrying out excitation on a test system by utilizing a magnetic field with a fixed frequency of 4Hz; controlling two sliding blocks to move on synchronous guide rails by utilizing two stepper motorsto form a transmission apparatus, so that the weak magnetic sensor fixed on the sliding block is allowed to scan the entire sample surface; collecting measurement data and position information of theweak magnetic sensor in real time by utilizing a data acquisition module; and carrying out band-pass filtering and pseudo image processing on the data collected by the data acquisition module by utilizing a data processing and pseudo-imaging system, thereby realizing detection and location of internal defects of material. The method can detect the internal defects of the composite material; and due to existence of excitation of an external stable magnetic field and band-pass filtering realized by utilizing a Kaiser window during data processing, the method can be used when the experimental environment has great interference.

Description

technical field [0001] The invention belongs to the field of nondestructive testing, and in particular relates to a scanning nondestructive testing system and method based on a magnetic field weakening sensor. Background technique [0002] With the development of technology and technology, more and more composite materials are used in aerospace, information, transportation and other fields. With the widespread use of composite materials, some problems have gradually emerged. In the preparation process of composite materials, it may be limited by the manufacturing process and human factors, and there will be some defects inside it. Some of these defects can be detected by conventional non-destructive testing methods, such as infrared testing, ultrasonic testing, ray testing, etc. However, in some situations where the thickness of the material is relatively large and the detection environment is relatively complex, the above methods cannot obtain good detection results, so s...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the thickness of the composite material is too large, and it is not convenient to use infrared detection, ultrasonic detection, radiation detection and other detection means for detection, and to provide a scanning nondestructive detection system and method based on a weak magnetic sensor. In the case of reducing external magnetic field interference, the defect can be accurately detected, and the two-dimensional image of the defect can be obtained, so as to realize the precise positioning of the defect and form a fast and accurate visual automatic detection

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