Laser Ultrasonic Real-Time Monitoring of Photothermal Modulation Crack Closure

被引：6
作者：
You Bowen [1 ]
Ni Chenyin [2 ]
Shen Zhonghua [1 ]
机构：
[1] Nanjing Univ Sci & Technol, Sch Sci, Nanjing 210094, Jiangsu, Peoples R China
[2] Nanjing Univ Sci & Technol, Sch Elect & Opt Engn, Nanjing 210094, Jiangsu, Peoples R China
来源：
CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG | 2019年 / 46卷 / 02期
关键词：
measurement; laser induced ultrasonic; nondestructive testing; surface acoustic wave; peak-to-peak value; INSPECTION; DEFECTS; WAVES;
D O I：
10.3788/CJL201946.0204009
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Based on the laser ultrasonic method, the transmitted ultrasonic signals are monitored in real-time when the crack is irradiated with a heating laser and naturally cooled. Under the irradiation of different power heating laser, three typical processes of the crack wall asperities are obtained when the crack is closed by the irradiation of heating laser, and the causes of these different processes are analyzed and discussed. The results show that the change of crack under heating laser irradiation and natural cooling condition is related to the initial morphology characteristics of the crack when it is not heated.
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页数：11
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