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A pulsed eddy current electromagnetic nondestructive testing method based on a coil probe with iron core

A technology of iron core coil and pulsed eddy current, which is applied in the direction of electromagnetic measuring device, electric/magnetic thickness measurement, material magnetic variable, etc., can solve the problems such as the limitation of the detection ability of the hollow probe, the large distribution area of ​​the pulsed magnetic field, and the weak detection signal, etc., to achieve Effects of fast attenuation, short diffusion time, and enhanced detection capability

Active Publication Date: 2017-05-17
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pulsed magnetic field generated by this hollow probe method has a large distribution area, and the detection signal obtained by the pulsed eddy current field detection sensor is weak and noisy
When the outer cladding layer of the component is thick or the wall thickness of the component to be inspected is large, the detection capability of the hollow probe method is limited

Method used

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  • A pulsed eddy current electromagnetic nondestructive testing method based on a coil probe with iron core
  • A pulsed eddy current electromagnetic nondestructive testing method based on a coil probe with iron core
  • A pulsed eddy current electromagnetic nondestructive testing method based on a coil probe with iron core

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Embodiment 1

[0066] The following is an example of implementing pulsed eddy current detection on a steel pipe with a cladding layer by using a coil probe with an iron core in the present invention. The detection object is a 20# steel pipe with an outer diameter of 180.0mm and a wall thickness d of 11.0mm. The electrical conductivity σ of the steel pipe is 4MS / m, and the relative magnetic permeability μ r is 300, and the thickness of the outer cladding layer of the pipe is 40mm. Depend on The pulse eddy current diffusion time constant τ of the tested steel pipe can be calculated e = 18.5ms.

[0067] According to the test method of band iron core coil probe, measure the probe that the present invention designs in the air excitation current falling edge such as Figure 4 In the middle curve, the time constant τ of the probe is measured s = 0.28ms. Visible, there is Established, it shows that when using the coil probe with iron core designed by the present invention to implement pulsed...

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Abstract

The invention discloses a pulsed eddy current electromagnetic nondestructive testing method based on a probe with an iron core coil. The probe is composed of an iron core bundle, an excitation coil and a detection coil. detection coil. When the coil probe with iron core is used to perform pulsed eddy current testing on components, it can generate a spatially concentrated pulsed strong magnetic field, increase the excitation magnetic field, and improve the signal-to-noise ratio of the signal, which is beneficial to the large-wall thickness components under the condition of large lift-off Implement pulsed eddy current testing. When the pulsed eddy current electromagnetic nondestructive testing system based on the core coil probe is used for detection, the probe time constant τs is used to measure the influence of the pulsed eddy current field in the core on the detection signal. When τs is much smaller than the component diffusion time constant τe, the impact of the pulsed eddy current field in the iron core on the detection signal is negligible, and the effect of the coil probe with iron core can approximate the linear amplification of the paired detection signal, which simplifies the difficulty of signal processing .

Description

technical field [0001] The invention relates to the field of electromagnetic nondestructive testing, in particular to a pulsed eddy current electromagnetic nondestructive testing probe capable of generating a pulsed strong magnetic field, and a pulsed eddy current electromagnetic nondestructive testing method based on the coil probe with an iron core. Background technique [0002] In petroleum, chemical, electric power, metallurgy and other industrial fields, metal pipes and pressure vessels are widely used to transport and store liquid or gaseous media. Most of the transported media have the characteristics of high temperature, high pressure and strong corrosion, so the corrosion of pipelines and pressure vessels is very common. Corrosion will lead to the thinning of the wall thickness of the components, the decrease of the pressure bearing performance, causing leakage, explosion and other accidents, resulting in casualties and economic losses. Therefore, regular in-servic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/90G01B7/06
Inventor 雷银照陈兴乐
Owner BEIHANG UNIV
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