Defect detection method and system based on terahertz imaging

A terahertz imaging and defect detection technology, which is applied in optical testing of defects/defects, measurement devices, and material analysis by optical means, which can solve problems such as inability to detect live working tools and internal defects of power insulators.

Inactive Publication Date: 2019-12-20
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] This application provides a defect detection method and system based on terahertz imaging to solve the tec...

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  • Defect detection method and system based on terahertz imaging
  • Defect detection method and system based on terahertz imaging
  • Defect detection method and system based on terahertz imaging

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[0043] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0044] see figure 1 , is a schematic flowchart of a defect detection method based on terahertz imaging provided by an embodiment of the present invention. combine figure 1 , the defect detection method in the present application comprises the following steps:

[0045] Step S110: Divide the sample to be tested into several scanning points, ...

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Abstract

The invention discloses a defect detection method and a defect detection system based on terahertz imaging. The defect detection method comprises the steps of: dividing a detected sample into a plurality of scanning points, and carrying out stepped scanning on the plurality of scanning points by utilizing terahertz waves to obtain terahertz time-domain transmission pulses corresponding to the plurality of scanning points; analyzing the plurality of terahertz time-domain transmission pulses to obtain time-domain transmission pulse amplitude values corresponding to the plurality of scanning points; calculating grayscale values corresponding to the plurality of scanning points according to the time-domain transmission pulse amplitude values to obtain a grayscale map of the detected sample; and positioning defect parts in the detected sample according to the light and shade contrast in the grayscale map. According to the defect detection method and the defect detection system, the detectedsample is imaged based on the terahertz imaging technology, the time domain spectral data can be extracted according to the detected sample, the corresponding grayscale map is finally generated, andthe obtained grayscale map can enable the forms of various internal defects of the to-be-detected sample to be visualized, so that the defect detection can be precisely conducted on the to-be-detectedsample.

Description

technical field [0001] The present application relates to the technical field of terahertz nondestructive testing, and in particular to a defect detection method and system based on terahertz imaging. Background technique [0002] In the power system, the quality and reliability of live working tools and power insulators directly affect the safe and economical operation of the power system grid and the life safety of live workers. In the actual use process, the insulation operating rod will suffer from material deterioration, insulation damp or fiber breakage as the service life increases. Therefore, it is essential for the defect detection of live working tools and power insulators. [0003] At present, the defect detection method for live working tools and power insulators is to conduct power frequency and operation wave withstand voltage tests. The test process is as follows: Connect the sample to be tested to the equipment, turn on the power, and start the boost test. ...

Claims

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Application Information

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IPC IPC(8): G01N21/95G01N21/3586G01N21/01
CPCG01N21/01G01N21/3586G01N21/9515
Inventor 刘荣海程志强孔旭晖阎占元李松涛郭新良杨迎春郑欣何运华程雪婷杨雪滢周静波代可顺虞鸿江焦宗寒李宗红许宏伟宋玉峰陈国坤彭詠涛
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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