Scanning nondestructive testing system and method based on weak magnetic sensor

A weak magnetic sensor, non-destructive testing technology, applied in the size/direction of the magnetic field, magnetic field measurement using the principle of magnetic flux control, instruments, etc., can solve the problems of inconvenient infrared detection, large thickness of composite materials, etc., to achieve rapid identification and positioning. , to achieve the effect of automation

Pending Publication Date: 2019-05-10
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 syste

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  • Scanning nondestructive testing system and method based on weak magnetic sensor
  • Scanning nondestructive testing system and method based on weak magnetic sensor

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specific Embodiment approach 1

[0015] Specific Embodiment 1: This embodiment describes a scanning non-destructive testing system based on a magnetic field weakening sensor, such as figure 1 As shown, the system includes a host computer, a data acquisition module, a transmission device, and a magnetic field weakening sensor;

[0016] The host computer includes a data processing and pseudo-imaging system and a two-dimensional scanning and positioning system. The two-dimensional scanning and positioning system controls the weak magnetic sensor to scan the sample to be tested through the transmission device, and the signal of the weak magnetic sensor is transmitted to the data in one direction. The acquisition module, the signal of the data acquisition module is transmitted to the data processing and pseudo-imaging system in one direction. The above-mentioned system is excited by a magnetic field with a fixed frequency of 4 Hz, and the transmission device includes two stepping motors, two sliders and two synchr...

specific Embodiment approach 2

[0017] Specific embodiment two: a method for scanning non-destructive testing using the scanning non-destructive testing system based on the magnetic field weakening sensor described in specific embodiment one, the specific steps of the method are as follows:

[0018] Step 1: Use a 4Hz fixed-frequency magnetic field to excite the test system. This operation can provide a stable magnetic field for the entire test environment and weaken external interference; the magnetic field excitation device can be placed not far from the overall device;

[0019] Step 2: Use two stepping motors to control two sliders to move on the synchronous guide rail to form a transmission device, so that the weak magnetic sensor fixed on the slider can scan the entire sample surface, and use the data acquisition module to scan in real time The measurement data and the position information of the weak magnetic sensor are collected; the fixed weak magnetic sensor is used for scanning detection, which is co...

specific Embodiment approach 3

[0022] Specific embodiment three: the scanning non-destructive testing method based on the scanning non-destructive testing system based on the weak magnetic sensor described in the second specific embodiment, in step 1, the specific magnetic field is formed by the following method: two magnetic induction coils are arranged orthogonally At the same time, 10A alternating current is applied to the two magnetic induction coils, and a sinusoidal magnetic field that is stable in the three axes of X, Y, and Z can be generated in the entire test environment, that is, a magnetic field strength in all directions in a space is generated. The same magnetic field ensures that the total magnetic field strength is stable during the measurement.

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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...

Claims

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Application Information

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IPC IPC(8): G01N27/85G01R33/04G01R33/10
Inventor 萧鹏丁雨谢殷立娟
Owner HARBIN INST OF TECH
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