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Laser ultrasonic three-dimensional localization and quantitative detection method for multiple defects in material

A quantitative detection method, laser ultrasonic technology, applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, etc., can solve the problems of multiple defects, insufficient detection sensitivity and accuracy, etc., to facilitate signal processing and analysis, and overcome the influence of detection sensitivity , Quantitative detection results are accurate and stable

Active Publication Date: 2020-02-11
INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS
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Problems solved by technology

[0010] The technical problem to be solved by the present invention is: for submillimeter small defects, especially when there are multiple defects inside the material, when the traditional pulse reflection body wave method, body wave transmission method or diffraction time-of-flight method is used for detection, the existence detection The problem of insufficient sensitivity and accuracy, the present invention provides a laser ultrasonic three-dimensional positioning and quantitative detection method for multiple defects in the material to solve the above problems

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  • Laser ultrasonic three-dimensional localization and quantitative detection method for multiple defects in material
  • Laser ultrasonic three-dimensional localization and quantitative detection method for multiple defects in material
  • Laser ultrasonic three-dimensional localization and quantitative detection method for multiple defects in material

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Embodiment 1

[0048] This embodiment provides a laser ultrasonic three-dimensional positioning and quantitative detection method for multiple defects inside the material. The specific implementation scheme is as follows:

[0049] The size of the aluminum alloy sample is 120mm×80mm×10mm, and there are multiple side through-hole defects drilled inside, with diameters of 0.5mm and 0.8mm respectively. The samples are distributed at different depths at the same horizontal position, such as figure 2 shown.

[0050] Nd: YAG laser 1 excites a pulsed laser with a wavelength of 1064nm, a pulse width of 10ns, a repetition rate of 30Hz, and a single pulse energy of 20mJ. After passing through a convex lens 2 (using a cylindrical lens), a linear light source focused at 5mm×0.2mm is irradiated on the aluminum alloy. The ultrasonic body wave excited on the upper surface of the sample 8 is divided into an obliquely transmitted ultrasonic body wave 10 and an incident ultrasonic transverse wave 11 on the bo...

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Abstract

The invention discloses a laser ultrasonic three-dimensional localization and quantitative detection method for multiple defects in a material. Under two-dimensional scanning conditions, the internaldefects are subjected to localization detection at crossing points of three propagation direction paths by using an excited oblique transmission ultrasonic bulk wave, a bottom incident ultrasonic transverse wave and a bottom reflected transverse wave, and the internal defects are quantitatively detected using the oblique transmission ultrasound body wave attenuation or wave-front delay. The amplitude of the oblique transmission ultrasonic body wave and the bottom reflected transverse wave after defect attenuation and transmission is much larger than the amplitude of the reflected or diffractedwave of the defects, which overcomes the problems of weak ultrasonic signals and low signal-to-noise ratio when detecting sub-millimeter micro defects. The oblique transmission ultrasonic body waves,bottom incident ultrasonic transverse waves and bottom reflected transverse waves respectively interact with the defects from three directions, the internal defects can be accurately located based onthe three ultrasonic intersections of the attenuation position, and accurate quantitative detection of multiple defects can be realized, which is suitable for sub-millimeter-level multi-defect localization and quantitative detection of detection materials.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing of materials, in particular to a laser ultrasonic three-dimensional positioning and quantitative testing method for multiple defects inside a material. Background technique [0002] In many fields such as engineering construction, the existence of internal defects will seriously affect the quality and performance of materials. Therefore, timely and accurate nondestructive testing of internal defects of materials is of great significance. With the development of industrial automation and intelligence, the future demand for non-destructive testing methods is to have non-contact, online, high-precision and high-efficiency testing capabilities. As an emerging nondestructive testing method, laser ultrasonic technology has the advantages of non-contact, no radiation, fast detection speed, and high spatial resolution, and has broad application prospects in the detection of internal defect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07G01N29/11
CPCG01N29/11G01N29/07
Inventor 孙凯华王增勇李建文孙朝明黄姝珂葛继强高伟
Owner INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS
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