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Sensor device for detecting metal wall thickness by pulsed eddy current

A sensor device and pulsed eddy current technology, which is applied to measurement devices, electromagnetic measurement devices, electrical devices, etc., can solve the problems that the sensor device cannot be shielded by external environmental factors, the frequency component of the excited spatial electromagnetic field is single, and the detection data has a large influence, etc. Achieving the effect of enriching frequency components, improving detection sensitivity and improving detection rate

Pending Publication Date: 2020-03-27
SHAANXI TECHN INST OF DEFENSE IND
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  • Abstract
  • Description
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Problems solved by technology

[0003] (1) The traditional sensor device has a single frequency component of the excited space electromagnetic field and cannot focus, and cannot accurately identify and evaluate local defects or corrosion perforations
[0004] (2) Traditional sensor devices cannot shield external environmental factors, and the detection sensitivity is low
[0005] (3) The self-inductance effect and mutual inductance effect of traditional sensor devices have a greater impact on the detection data

Method used

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  • Sensor device for detecting metal wall thickness by pulsed eddy current

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] Such as figure 1 As shown: the present invention provides a pulsed eddy current sensor device for detecting metal wall thickness, which consists of an I-shaped frame 1, an excitation coil 2, a detection coil 3, a cylindrical magnetic core 4, a tetrafluorocloth 5, a shielding layer 6, and a casing 7.

[0022] The excitation coil 2 is installed at both ends of the I-shaped frame 1, the connection mode between the excitation coils 2 is series connection, the detection coil 3 is installed at the center of the I-shaped frame 1, and the cylindrical magnetic core 4 is installed at the center of the I-shaped frame 1. The central hole, the cylindrical magnetic core 4 is wrapped by tetrafluoro cloth 5, the shielding layer 6 is installed on the outside of the I-shaped skeleton 1, and the whole sensor is located in the shell 7.

[0023] The excitation coil 2 is w...

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Abstract

The invention discloses a sensor device for detecting metal wall thickness by pulsed eddy current. The device comprises an I-shaped framework, excitation coils are respectively arranged at two ends ofa horizontal framework of the I-shaped framework, detection coils are arranged at the two ends of a vertical framework of the I-shaped framework, a center hole is formed in the center of the upper portion of the I-shaped framework, a cylindrical magnetic core is installed in the center hole, the outer side of the cylindrical magnetic core is wrapped with polytetrafluoroethylene cloth, a shieldinglayer of a square structure is arranged on the outer side of the I-shaped framework, and the shielding layer is located in the shell. The excitation electromagnetic field energy is large; the frequency components are rich, a space electromagnetic field can be highly concentrated, the detection rate of local corrosion and hole-shaped corrosion is improved, the shielding effect on the external environment is achieved, interference of detection signals is reduced, the filtering effect on the detection signals is achieved, the signal quality is improved, effective detection data are further obtained, and the detection sensitivity is improved.

Description

technical field [0001] The invention relates to the technical field of special instruments for non-destructive detection and evaluation of the corrosion degree of metal pipelines, in particular to a sensor device for pulsed eddy current detection of metal wall thickness. Background technique [0002] At present, the advantages of pipelines such as low operating cost, high safety, and convenience have attracted the attention of scientific researchers, and have become one of the most commonly used means of energy transportation. Most of the pipelines will be buried in the ground. The dark and humid underground environment will affect the service life of the pipeline. With the increase of the service life of the pipeline, the pipeline will undergo oxidation, hydrogen evolution reaction and microbial corrosion, and cracks or perforations will appear. If it is not discovered in time Energy leakage will occur, which will not only pollute the environment but also endanger people's ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/06G01N27/90
CPCG01B7/10G01N27/9006
Inventor 张涛
Owner SHAANXI TECHN INST OF DEFENSE IND
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