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An ultrasonic c-scan imaging method based on dac curve

A scanning imaging and ultrasonic technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve the problems of complex image processing process and unintuitive display of equivalent size, etc., to achieve wide application prospects, facilitate on-site detection, and improve efficiency.

Inactive Publication Date: 2017-12-29
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide an ultrasonic C-scan imaging method based on the DAC curve to compensate for the influence of factors such as material attenuation and near-field effects on the echo intensity, and to solve the problem of complex image processing after the formation of the ultrasonic C-scan image and the problem of equivalent size display. unintuitive technical issues

Method used

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  • An ultrasonic c-scan imaging method based on dac curve
  • An ultrasonic c-scan imaging method based on dac curve
  • An ultrasonic c-scan imaging method based on dac curve

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Embodiment 1

[0028] A kind of ultrasonic C-scan imaging method based on DAC curve, concrete steps are as follows:

[0029] Step 1. Select a test block with the same material as the workpiece to be inspected, and the test block has more than 3 defects with the same aperture and different depths:

[0030] The material of the workpiece to be inspected is aluminum alloy as an example. First, select the test block of aluminum alloy material. The equivalent of the flat-bottomed hole of the test block is 1.2mm, and the flat-bottomed hole is a regular reflector. The flat-bottomed hole has 8 different depths, respectively 2.5mm, 7.5mm, 30mm, 50mm, 70mm, 90mm, 110mm, 120mm.

[0031] Step 2. Determine the DAC curve mode and curve fitting method, collect the echo amplitude and sound path data of defects at different depths, and fit the amplitude and sound path data according to the DAC curve mode and curve fitting method selected above to complete the DAC curve:

[0032] There are many types of DAC ...

Embodiment 2

[0047] A kind of ultrasonic C-scan imaging method based on DAC curve, concrete steps are as follows:

[0048] Step 1. Select a test block with the same material as the workpiece to be inspected, and the test block has more than 3 defects with the same aperture and different depths:

[0049] Example 2 of the present invention The material of the inspected workpiece is a magnesium alloy. A test block of the same material is selected. The regular reflector in the test block is a flat-bottomed hole with an equivalent of 1.2mm and 7 different depths, respectively 2.5mm, 7.5mm, and 20mm. , 50mm, 80mm, 90mm, 100mm.

[0050] Step 2. Determine the DAC curve mode and curve fitting method, collect the echo amplitude and sound path data of defects at different depths, and convert the echo amplitude and sound path data of defects at different depths according to the DAC curve mode and curve fitting method selected above Fitting to complete the DAC curve:

[0051] The DAC curve selects th...

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Abstract

The invention discloses an ultrasonic C-scan imaging method based on the DAC curve. The method compares the echo height obtained by the ultrasonic flaw detection system with the height at the corresponding sound path of the fitted DAC curve, and obtains the two dB difference, the color value is modulated according to the difference or the curve interval where the highest echo height is located, and the C-scan image is generated in combination with the workpiece position where the scanning device of the flaw detection system is located. This method uses the DAC curve, which can compensate the influence of factors such as material attenuation, near-field effect, sound velocity scattering and surface roughness, and can avoid the edge detection and segmentation of subsequent C-scan images in quantitative analysis. The color setting of the image can intuitively determine the equivalent size or range of the workpiece defect, thereby omitting the pixel statistics step in the defect analysis and reducing the complexity of the detection result processing.

Description

technical field [0001] The invention belongs to the field of ultrasonic nondestructive testing, and relates to an ultrasonic C-scan imaging method based on a DAC curve. Background technique [0002] Ultrasonic C-scan imaging method is based on the modulation and imaging of cross-sectional echo information perpendicular to the propagation direction of the sound beam within the ultrasonic detection range during workpiece detection. This method can visually display the position and size of the defect, and then can qualitatively and quantitative analysis. However, the traditional C-scan imaging method, such as an automatic ultrasonic C-scan detection system for ring forgings proposed in Chinese Patent Application No. 201410305302. The impact of the echo intensity between the probes is considered, and the defect detection results need to analyze and process the C-scan image to obtain the defect area and determine whether the workpiece is qualified. The actual operation is compli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/06
Inventor 卜雄洙侯亚宾许有昌王新征张振宛静耿永健严曙孟哲
Owner NANJING UNIV OF SCI & TECH
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