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Pipeline inner wall detection system and method

A detection system and pipeline technology, used in measuring devices, instruments, using ultrasonic/sonic/infrasonic waves, etc., can solve the problems of ultrasonic guided wave attenuation, affecting ultrasonic guided wave attenuation, spending more time and labor, etc.

Active Publication Date: 2019-08-02
LASER RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in addition to ultrasonic guided wave testing, the above-mentioned various methods can only evaluate the local area where the testing device is placed, which means that it takes more time and labor compared with long-distance pipeline testing
In addition, the attenuation of the ultrasonic guided wave is more serious at the weld of the pipeline, and the surrounding environment of the pipeline also directly affects the attenuation of the ultrasonic guided wave
At present, there is no better solution to realize the long-distance detection of pipelines

Method used

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  • Pipeline inner wall detection system and method
  • Pipeline inner wall detection system and method

Examples

Experimental program
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no. 1 example

[0029] See figure 1 This embodiment provides a pipeline inner wall detection system, which includes: a vector network analyzer device 100, a coaxial feed end cover device 110, and a terminal short-circuit end cover 120. The input end of the coaxial feed end cover device 110 is connected to the vector network analyzer device 100, and the output end of the coaxial feed end cover device 110 is used to connect to one end of the pipeline 200 to be tested. The terminal short-circuit end cover 120 is used to connect to the other end of the pipe under test 200, so that the coaxial feed end cover device 110 and the terminal short-circuit end cover 120 respectively seal both ends of the pipe under test 200 Form a microwave cavity.

[0030] The pipeline 200 to be tested may be a metal pipeline. For example, the pipeline 200 to be tested may be but not limited to a copper pipeline. Regarding the metal pipe as a cylindrical waveguide, the microwave can be transmitted over a long distance in...

no. 2 example

[0085] See Figure 7 The embodiment of the present invention provides a method for detecting the inner wall of a pipeline, which is applied to the above-mentioned system, and the method includes:

[0086] Step S300: The vector network analyzer device outputs microwaves and transmits the microwaves to the coaxial feed end cover device;

[0087] Step S310: The coaxial feed end cover device propagates the received microwave into the pipeline to be tested, and receives a standing wave, which short-circuits the end cover from the middle edge of the microwave to the terminal The direction transmission part and the part reflected back through the terminal short-circuit end cover are superimposed and formed;

[0088] Step S320: The coaxial feed end cover device also transmits the received standing wave to the vector network analyzer device;

[0089] Step S330: The vector network analyzer device also processes the standing wave to obtain the inner wall thickness condition of the pipeline to b...

Embodiment approach

[0090] As an implementation manner, based on step S330, step S330 may include sub-step S331, sub-step S332, sub-step S333, and sub-step S334.

[0091] Sub-step S331: The vector network analyzer device obtains the first resonance frequency of the pipeline to be tested based on the acquired inner diameter and length of the pipeline to be tested and a first preset rule;

[0092] Further, based on Obtain the first resonance frequency of the pipeline to be tested; where f 0 Is the first resonance frequency of the pipeline to be tested, R is the inner diameter of the pipeline to be tested, l is the length of the pipeline to be tested, μ is the first preset constant, and ε is the second preset constant. It can be understood that the formula (13) in the first embodiment is the first preset rule. The electrical parameters of the medium filled in the resonant cavity, ε is the electrical constant ε and μ is the magnetic permeability μ.

[0093] Sub-step S332: Obtain the second resonance frequ...

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Abstract

The invention provides a system and method for detecting an inner wall of a pipe, and relates to the technical field of microwave detection. The system comprises a vector network analyzer device, a coaxial feed end cover device, and a terminal short-circuit end cover. The input end of the coaxial feed end cover device is connected with the vector network analyzer device, and the output end of the coaxial feed end cover device is used for connecting one end of a to-be-detected pipe. The terminal short-circuit end cover is connected to the other end of the to-be-detected pipe, so that the coaxial feed end cover device and the terminal short-circuit end cover respectively seal two ends of the to-be-detected pipe, thereby forming a microwave resonant cavity. Therefore, the microwave resonant cavity is formed through the long-distance transmission of microwaves in the to-be-detected pipe, and the system achieves the long-distance detection of the to-be-detected pipe.

Description

Technical field [0001] The invention relates to the technical field of microwave detection, and in particular to a pipeline inner wall detection system and method. Background technique [0002] Metal pipelines are widely used in industrial production, such as: oil and gas transmission, chemical, nuclear industry and other fields. If the thinning of the inner wall of the pipeline cannot be detected and dealt with in time, it will cause serious damage to the leakage of transmission materials. Therefore, the detection of the thinning of the inner wall of the metal pipe and the evaluation of the pipe life are very important. In recent years, the detection methods applied to metal pipelines mainly include: radiation method, ultrasonic method, eddy current detection method, etc. However, in addition to ultrasonic guided wave detection, the above-mentioned various methods can only evaluate the local area where the detection device is placed. Compared with the long-distance pipeline de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B17/02
CPCG01B17/02
Inventor 马健赵扬周英丽陈建伟贾中青巨阳刘帅
Owner LASER RES INST OF SHANDONG ACAD OF SCI
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