Detection of surface defects for longitudinal acoustic waves by a laser ultrasonic imaging technique

作者：Zeng, Wei^*; Wang, Haitao; Tian, Guiyun; Wang, Wen

来源：Optik, 2016, 127(1): 415-419.

DOI：10.1016/j.ijleo.2015.09.175

• Pulsed laser
• Surface damage
• The velocity
• Longitudinal acoustic waves
• Laser ultrasonic imaging technique

The main objective of this paper was to use the p-waves to quantitatively evaluate the surface cracks by a laser ultrasonic imaging technique. The p-waves were generated by a pulsed laser illuminated on the specimen with a surface damage and received by a piezo transducer. According the relationship between the propagation distances with the p-waves velocity, we analyzed the time (1.5 mu s) of the maximum forward amplitude of the once P-waves arrived at the receiver when the pulse laser illuminated at different excitation points, and analyzed the vibration of the p-waves at different distance from the surface damage at 1.5 mu s. At last, C-scan image and estimated size and location as determined by p-waves amplitude at 1.5 mu s were used to detect the sizes of the damage. The experimental results showed that using longitudinal acoustic waves by a laser ultrasonic imaging technique is an effective way for the investigation of surface damage.

• 出版日期2016
• 单位南京航空航天大学; 淮阴师范学院