Abstract
The objective of this study is to investigate laser-ultrasonic methods for non-contact detection and characterization of rail defects. Theoretical studies reveal that the most effective wave mode for detecting transverse defects is the shear wave propagating at high angles. Accordingly, a laser ultrasonic detection scheme based on the principle of ultrasonic shadowing is presented and its optimal configuration is studied. The feasibility of this approach is evidenced by the proof-of-concept tests showing the capability of generating and detecting ultrasonic signals for rail specimens with transverse head defects. In addition, a scheme for sizing and locating the flaw is presented. The outcome of the feasibility tests looks promising; the laser method may be implemented as a non-contact NDE method for detecting such flaws as transverse defects masked by longitudinal shells, which are blind to traditional ultrasonic techniques.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
