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Method for enhancing lateral resolution of ultrasonic testing images

A technology of lateral resolution and ultrasonic testing, which is applied in the direction of processing detection response signals, etc., can solve problems such as low positioning accuracy and difficult identification, improve defect quantification and positioning accuracy, enhance defect lateral resolution, and facilitate popularization and application value effect

Inactive Publication Date: 2016-03-16
DALIAN UNIV OF TECH +2
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Problems solved by technology

Aiming at the problems of difficult defect identification, quantification, and low positioning accuracy caused by low resolution in the inspection image

Method used

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  • Method for enhancing lateral resolution of ultrasonic testing images
  • Method for enhancing lateral resolution of ultrasonic testing images
  • Method for enhancing lateral resolution of ultrasonic testing images

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Embodiment Construction

[0029] In a method for enhancing the lateral resolution of an ultrasonic testing image, the ultrasonic testing system adopted is such as figure 1 As shown, it includes a TOFD ultrasonic flaw detector, a computer integrated with routine analysis software, a TOFD probe with a nominal frequency of 5MHz, etc. The measurement and processing steps are as follows:

[0030] (a) The research object is a carbon steel test block, the size of the test block is 300mm×30mm×50mm, the height of the opening crack on the bottom surface is 20mm, the depth is 30mm, and the sound velocity of the longitudinal wave of the material is 5900m / s. The probe frequency of TOFD ultrasonic testing is 5MHz, the chip size is 6mm, the wedge angle is 60°, and the center distance of the probe is set to 2S=104mm, such as figure 2 shown. The start position of the scan time window is set before the through wave reaches the receiving probe, the end position is after the defect signal reaches the receiving probe, a...

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Abstract

A method for enhancing lateral resolution of ultrasonic testing images belongs to the field of ultrasonic non-destructive testing. According to the method, an ultrasonic testing system including an ultrasonic flaw detector, a test probe and a scanning device is adopted to test flaws so as to obtain an image, and an A scanning signal which forms the image is exported. Firstly, image reconstruction is carried out on the A scanning signal obtained in the testing image; secondly, phase information of the A scanning signal is extracted by the euler's formula, and a phase distribution matrix is obtained on the basis of time delay and phase stacking; and finally, a reconstructed image undergoes weighting treatment by the utilization of the phase distribution matrix so as to enhance lateral resolution of flaws in the testing image. The method for enhancing lateral resolution of ultrasonic testing images can be embedded into the flaw detector to realize automatic real-time imaging of the ultrasonic testing system. The method of the invention has good promotion and application value.

Description

technical field [0001] The invention relates to a method for enhancing the lateral resolution of ultrasonic detection images, which belongs to the technical field of ultrasonic nondestructive detection. Background technique [0002] In order to effectively evaluate the physical integrity of the detected object, it is necessary to detect the defects, as well as accurately locate and quantify them. Ultrasonic testing technology is applied in non-destructive testing due to its simple principle, good reliability, simple and fast testing, and intuitive results. However, due to the certain coverage of the sound beam of the probe, the lateral resolution of the defect image in the detection image is low, which interferes with the accurate capture of the crack endpoint and affects the quantification and positioning accuracy of the defect. [0003] In order to overcome the above disadvantages, synthetic aperture focusing method, small transformation method and other methods have been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/44
CPCG01N29/44
Inventor 林莉康达张东辉陈尧刘丽丽金士杰杨会敏罗忠兵冯英超曹欢庆郭彦辉张树潇赵天伟雷明凯
Owner DALIAN UNIV OF TECH
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