Surface leakage wave ultrasonic synthetic aperture focusing imaging method

A technology of synthetic aperture focusing and focusing imaging, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, and re-radiation of sonic waves, etc. It can solve the problem of failure to detect defect features and low detection efficiency. , Failure to realize detection imaging and other problems, to achieve the effect of improving detection efficiency and imaging resolution

Active Publication Date: 2020-10-09
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Application Information

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Problems solved by technology

For example, in the literature "Chang Junjie, Wang Xingguo, Xu Jiujun. Quality evaluation of plasma sprayed coatings based on leaky Rayleigh waves [J]. Rare Metal Materials and Engineering, 2009, 38(S2): 726-730" through the analysis of no

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  • Surface leakage wave ultrasonic synthetic aperture focusing imaging method
  • Surface leakage wave ultrasonic synthetic aperture focusing imaging method
  • Surface leakage wave ultrasonic synthetic aperture focusing imaging method

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Embodiment Construction

[0031] The experimental system of the present invention is composed of a mechanical motion control device, an ultrasonic pulse generating receiver, a water immersion focusing probe, an ultrasonic acquisition card and a workpiece to be tested, and 10 linearly distributed drilled steel test blocks with a diameter of 1mm are selected as the workpiece to be tested , the distance between the two holes is about 2mm, and the measured workpiece size is 120mm×100mm.

[0032] The steps of performing leaky surface wave ultrasonic synthetic aperture focusing imaging on the workpiece surface detection area include:

[0033] Step 1. Place the workpiece to be tested in the water tank of the water immersion ultrasonic testing device with X / Y / Z / A four-axis motion control. According to the acoustic characteristics of the workpiece and water to be tested, use Snell's law to determine the water immersion Rayleigh angle α during detection R , where c l is the propagation speed of longitudinal ...

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Abstract

The invention discloses a surface leakage wave ultrasonic synthetic aperture focusing imaging method. Efficient high-resolution imaging detection of defects on the surface or near surface of a part isachieved. A four-axis motion detection device controls a water immersion focusing probe to obliquely enter the surface of a workpiece to generate surface leakage waves, then surface leakage wave pulse echo signals are collected, and finally the surface leakage wave pulse echo signals are subjected to synthetic aperture focusing imaging to achieve defect recognition. The method has the technical effects that imaging of defects on the surface or the near surface of the part can be efficiently achieved in a non-contact mode, the detection efficiency and the imaging resolution are improved, and an effective nondestructive detection method is provided for evaluating the surface quality of a metal component.

Description

technical field [0001] The invention relates to an ultrasonic non-destructive testing imaging method, in particular to a leakage surface wave ultrasonic synthetic aperture focusing imaging method. Background technique [0002] Metal or non-metallic components are prone to surface or near-surface defects during manufacturing and use, such as corrosion, surface pores, cracks and slag inclusions, etc. These defects will cause stress concentration, reduce fatigue strength, reduce bearing capacity, and even cause component damage. Fractures, etc., seriously affect the quality of components and equipment safety. [0003] Ultrasonic testing is a commonly used non-destructive testing method. At present, the use of ultrasonic longitudinal waves and transverse waves to detect the surface or near the surface of parts often has problems such as difficult identification of defects and poor imaging effects due to the sharp fluctuation of sound pressure in the near-field area and the overl...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/06G01N29/24G01N29/22G01N29/44G01N29/48G01S15/89G01S7/539
CPCG01N29/041G01N29/0645G01N29/069G01N29/2456G01N29/221G01N29/449G01N29/48G01S15/89G01S7/539G01N2291/0234G01N2291/0289G01N2291/0425Y02A90/30
Inventor 胡宏伟田佳沈晓炜王磊徐晓强王向红李达宇田竞红
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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