Changes in laser-induced thermoelastic effects depending on the position of an absorbing layer in indirect laser stimulation

Yang, Seunghwa; Kim, Hyung–Sik; Jun, Jae-Hoon; Chung, Soon−Cheol; Park, Jong-Rak

doi:10.1007/s40042-022-00432-y

Cited by 1 publication

(1 citation statement)

References 9 publications

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“…Laser-excited ultrasound is a process in which laser energy is converted into mechanical energy [24]. When a pulsed laser beam is incident on a solid surface, part of the laser energy is absorbed by the solid and converted into heat energy.…”

Section: Methodsmentioning

confidence: 99%

Laser Ultrasonic Automatic Detection Method for Surface Microcracks on Metallic Cylinders

Zhang

Feng

et al. 2023

Photonics

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Metallic cylinders are widely used in various fields of industrial production, and the automatic detection of surface microcracks is of great significance to the subsequent grinding process. In this paper, laser-excited surface acoustic waves (SAW) are used to detect surface microcracks. Due to the dispersion of SAWs on the cylinder surface, the SAWs exhibit different polarities at different positions. In order to improve the consistency of signals and the accuracy of the modeling, the angle at which the polarity is completely reversed is selected as the detection point. A laser ultrasonic automatic detection system is established to obtain signals, and the B-scan image is drawn to determine the location of the microcrack. By comparing the time–frequency diagrams of the reflected SAWs and transmitted SAWs, the transmitted wave is chosen to establish the microcrack depth prediction model. In addition, according to the trajectory of the grinding wheel, a prediction model based on the absolute depth of the microcracks is established, and the influence of the orientation of the microcracks on the signal energy is considered. The method proposed in this paper can provide a reference for the rapid grinding of microcracks on the surface of metallic cylinders; it has the characteristics of visualization and high efficiency, and overcomes the shortcomings of the currently used eddy current testing that provides information on the depth of microcracks with difficulty.

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Section: Methodsmentioning

confidence: 99%