Laser Ultrasound in Transmission Mode for Defect Detection of Additive Manufactured Parts
- Resource Type
- Conference
- Authors
- Fang, Haiji; Ye, Guoliang; Liang, Jinglun; Yang, Yuhui; Zhang, Bing
- Source
- 2021 IEEE 5th Advanced Information Technology, Electronic and Automation Control Conference (IAEAC) Advanced Information Technology, Electronic and Automation Control Conference (IAEAC), 2021 IEEE 5th. :2403-2407 Mar, 2021
- Subject
- Communication, Networking and Broadcast Technologies
Engineering Profession
Robotics and Control Systems
Signal Processing and Analysis
Ultrasonic imaging
Additives
Delay effects
Inspection
Laser modes
Laser excitation
Steel
laser ultrasound
non-destructive testing
internal defects
transverse wave
additive manufacturing
- Language
- ISSN
- 2689-6621
Laser ultrasonic non-destructive inspection may be difficult to detect small defects inside additive manufactured components due to weak longitudinal waves propagation. This paper proposes a defect detection method of using laser ultrasonic transverse waves in transmission mode. This method uses a scanning procedure of synchronously moving the laser ultrasound generator and the ultrasound detector on the opposite side of the sample. The cross-correlation algorithm is used to calculate the time delay of the transmitted transverse wave at each scanning point. Finally, the location of the internal defect can be estimated by considering the thickness of the sample and the distance between the two maximum signal delay points in the left scanning and the right scanning. The numerical simulation using finite elements method and the experimental results show that this method can successfully identify the internal defect of 1 mm diameter inside the additive manufactured 316L stainless steel components.