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JIN Jian, ZHOU Ruoyang, ZHAO Jinfeng, PAN Yongdong, LIU Xuezeng, SANG Yunlong, GU Sheng. Ultrasonic detection of concrete cracks by laser scanning[J]. LASER TECHNOLOGY, 2019, 43(4): 453-459. DOI: 10.7510/jgjs.issn.1001-3806.2019.04.004
Citation: JIN Jian, ZHOU Ruoyang, ZHAO Jinfeng, PAN Yongdong, LIU Xuezeng, SANG Yunlong, GU Sheng. Ultrasonic detection of concrete cracks by laser scanning[J]. LASER TECHNOLOGY, 2019, 43(4): 453-459. DOI: 10.7510/jgjs.issn.1001-3806.2019.04.004

Ultrasonic detection of concrete cracks by laser scanning

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  • Received Date: October 17, 2018
  • Revised Date: December 24, 2018
  • Published Date: July 24, 2019
  • In order to explore the feasibility of ultrasonic detection of concrete cracks by laser scanning, sound field was excited by laser scanning concrete surfaces and ultrasonic signal was received with a surface wave probe. The corresponding experimental verification was carried out. The peak value and bipolarity of the experimental signal were analyzed. The location of concrete surface cracks was realized. At the same time, the finite element method was used to simulate the process of scanning laser exciting sound field on the material surface. Ultrasound signal was analyzed in time domain and frequency domain. The results show that, when the distance between laser and crack edge is 1mm, the received signals have typical bipolarity and the peak value reaches the maximum value. When the distance between laser and crack edge continues to decrease, the peak value decreases rapidly. Using the stimulated ultrasound by laser scanning, a 2-D image represented by the peak value of the signal is formed in the dot range. The characteristics of peak-peak mutation and signal bipolarity can locate the defect edge of concrete surfaces.
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