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Ultrasonic intensity enhancing method suitable for underwater environment laser ultrasonic material detection and application

A laser ultrasonic and underwater environment technology, which is applied in the direction of material analysis, material analysis, and measuring devices through optical means, and can solve problems such as laser ultrasonic excitation intensity attenuation

Pending Publication Date: 2022-05-10
SHANDONG UNIV
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  • Description
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  • Application Information

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Problems solved by technology

However, the laser pulse is affected by the ionization loss of laser energy in the underwater environment, which leads to a significant attenuation of the laser ultrasonic excitation intensity.

Method used

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  • Ultrasonic intensity enhancing method suitable for underwater environment laser ultrasonic material detection and application

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Experimental program
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Embodiment 1

[0029] figure 1 Part A in the middle shows the physical principle of laser ultrasonic material detection, that is, the laser beam that is not enough to cause material surface ablation is irradiated to the material surface, and the thermoelastic effect occurs on the material surface, thereby exciting the ultrasonic wave to propagate into the material, and the ultrasonic wave propagates outward. The transmitted signal will carry the location information of three-dimensional defects or interface features inside the material; figure 1 Part B in the middle shows the ultrasonic enhancement process setting method suitable for underwater laser ultrasonic material detection proposed by the present invention, that is, adjusting the defocus state of the laser pulse on the surface of the material to be detected, and adjusting the positive ionization of the laser pulse relative to the material surface. The coke state is used to induce the cavitation effect to form a cavitation bubble deton...

experiment example

[0042] Take the detection of prefabricated flat-bottomed hole defects on the surface of a 200mm×100mm×3mm metal aluminum plate serving in the underwater environment as an example. The test is based on the defocus-free state testing device and process conditions of laser ultrasonic material detection, in which the laser pulse wavelength used is 1064nm, the energy is 650μJ, and the pulse width is 7ns. Preset the positive defocus of the laser beam relative to the material surface to be 2.6mm; adjust the position of the material to be detected so that it is 2.6mm away from the laser beam emission position; the laser ultrasonic correlation signal is received and analyzed by the PZT probe. The above-mentioned process conditions are used to perform defect detection in the area to be detected.

[0043] After 5 tests, after obtaining the defect detection results of the material to be detected, the position information of the tested defects is compared with the position information of t...

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Abstract

The invention relates to an ultrasonic intensity enhancing method suitable for underwater environment laser ultrasonic material detection and application, and belongs to the technical field of extreme environment material monitoring and detection.The relative position of a laser beam and the surface of a material is adjusted, so that the laser beam is kept in a positive out-of-focus state; by adjusting the defocusing state and the defocusing amount value of the laser pulse and the surface of the to-be-detected material, the ultrasonic excitation intensity is further enhanced by virtue of the cavitation bubble detonation wave, and finally, the impact wave with the magnitude of MPa is formed in the formation and annihilation process of the cavitation bubble; the impact wave acts on the surface of the material to greatly enhance the ultrasonic excitation intensity of the surface of the to-be-detected material, and ultrasonic detection of an underwater environment is realized.

Description

technical field [0001] The invention relates to an ultrasonic intensity enhancement method suitable for underwater environment laser ultrasonic material detection and its application, and belongs to the technical field of extreme environmental material monitoring and detection. Background technique [0002] As one of the green energy with the most development and application potential, laser has become an increasingly mature energy source in the field of material processing. With the development of modern industry, there is an increasingly strong demand for non-contact monitoring and testing of structural materials in extreme service environments such as nuclear power and marine engineering. Laser pulses are used as the basis for ultrasonic excitation. Laser ultrasonic material testing technology has shown important application value and potential. [0003] Nuclear reactor tubular member welds, offshore drilling platform pipe welds and other parts are the failure-prone areas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17
CPCG01N21/1702G01N2021/1706G01N2201/06113
Inventor 卢国鑫季忠刘欢卢国钢赵连瑞马文东
Owner SHANDONG UNIV
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