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Flexible sensor and metal component defect detection method

A technology of flexible sensors and metal components, applied in the field of flexible sensors, can solve problems such as being easily affected by environmental noise, difficult to quickly detect, and limited number of sensor units, achieving strong electromagnetic noise interference ability, high industrial application value, fast The effect of efficient detection

Active Publication Date: 2022-02-18
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Metal components are widely used in aerospace, petrochemical, nuclear power and other industrial fields. Due to various complex service environments, metal components are prone to various types of defects, which will affect the integrity and reliability of metal components. Components fail, which in turn causes major safety production accidents; therefore, it is of great significance to use non-destructive testing technology to efficiently detect metal component defects
[0003] Ultrasonic testing technology can accurately locate defects, and the equipment is light and harmless to the human body. However, ultrasonic testing generally requires a smooth surface of the measured object, a large amount of couplant, and requires operators to have a high level of technology. Radiographic testing technology is easy to detect. However, the detection accuracy is low, the cost is high, and there is a risk of polluting the environment and harming the operator; the results of penetrant testing are intuitive and reliable, and the detection sensitivity is high, but surface defects can be detected as much as possible; eddy current testing is harmful to metal materials. The detection sensitivity of component defects is high, but limited by the hardware equipment, the number of sensor units in the array probe is limited, it is difficult to achieve fast detection, the detection efficiency is low, and it is easily affected by environmental noise

Method used

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  • Flexible sensor and metal component defect detection method
  • Flexible sensor and metal component defect detection method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A flexible sensor such as figure 1 As shown, it includes a flexible base 1 and a sensing unit 2; a plurality of sensing units 2 are installed on the base 1 in an array, and the sensing unit 2 includes a container 3 and an excitation coil 6; the container 3 is filled with the same density The magnetic fluid 5 and the transparent solution 4, the transparent solution 4 and the magnetic fluid 5 are incompatible with each other, and no chemical reaction occurs; the excitation coil 6 is installed on the outer end of the container 3 close to the base 1, and is used to generate magnetic field.

[0040] The shape of the container 3 is a cylinder, and the excitation coil 6 is a disk, the excitation coil 6 is coaxial with the container 3, and the inner wall of the container 3 is coated with a uniform and transparent oleophobic coating. The transparent solution 4 cannot be too little, so as to ensure that the magnetic fluid 5 will not touch the top of the container 3 after deforma...

Embodiment 2

[0047]A metal component defect detection method, specifically according to the following steps:

[0048] Step 1, the establishment of the calibration curve of the defect depth of the metal component;

[0049] Connect the signal generator, the power amplifier and the flexible sensor of embodiment 1 in sequence, and attach the flexible sensor closely to the d standard metal components, the period is T , the duty cycle is 50%, the peak value is A , the bias current is A The square wave excitation current signal of / 2 drives the excitation coil 6 to work, such as figure 2 shown. at 10 T Afterwards, an excitation current of 0.4 was obtained through a 3D laser scanner T The three-dimensional shape of the magnetic fluid 5 in each sensing unit 2 P 1,1,1 , P 1,2,1 , P 1,3,1… P 1,n,1 , in the same way, the excitation current 0.6 T The three-dimensional shape of the magnetic fluid 5 in each sensing unit 2 P 2,1,1 , P 2,2,1 , P 2,3,1… P 2,n,1 . Attach the flexible...

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Abstract

The invention discloses a flexible sensor and a metal component defect detection method. The flexible sensor comprises a flexible substrate and sensing units, the multiple sensing units are installed on the substrate in an array mode, each sensing unit comprises a container and an exciting coil, the container is filled with magnetofluid and a transparent solution which are the same in density, the transparent solution and the magnetofluid are incompatible and do not generate chemical reaction; the exciting coil is mounted at the outer end, close to the substrate, of the container and used for generating a magnetic field after excitation current is introduced. The defects of the metal component can be rapidly, losslessly and accurately detected, the number of the sensing units is not limited by hardware equipment, the applicability is high, the reliability is high, the labor cost and the economic cost are reduced, and the method has important engineering application value.

Description

technical field [0001] The invention belongs to the technical field of flexible sensors, and relates to a flexible sensor and a defect detection method for metal components. Background technique [0002] Metal components are widely used in aerospace, petrochemical, nuclear power and other industrial fields. Due to various complex service environments, metal components are prone to various types of defects, which will affect the integrity and reliability of metal components. Components fail, which in turn causes major safety production accidents; therefore, it is of great significance to use non-destructive testing technology to efficiently detect metal component defects. [0003] Ultrasonic testing technology can accurately locate defects, and the equipment is light and harmless to the human body. However, ultrasonic testing generally requires a smooth surface of the measured object, a large amount of couplant, and requires operators to have a high level of technology. Radio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/85G01N27/84
CPCG01N27/85G01N27/84
Inventor 闫贝吕晓洲史尧光张维强姚斌
Owner XIDIAN UNIV