Title :
Laser ultrasonic inspection in ablation regime
Author :
Jin-Gyum Kim ; Sunghee Yoon ; Jooho Lee ; Kyung-Young Jhang
Author_Institution :
Dept. of Mech. Convergence Eng., Hanyang Univ., Seoul, South Korea
Abstract :
This article presents a laser-based ultrasonic technique (LBUT) in ablation regime for inspection of internal defects using the pulsed high-power laser (HPL) and two wave mixing (TWM) detector. Pulsed HPL source has been recognized as a good ultrasonic generator to overcome weakness of the conventional contact transducer in harsh environment such as high temperature and rough surface of measurement target. And TWM detecting as non-contact method was used to measure the displacement by laser ultrasonic wave. The aim of this study is to investigate transmission characteristics of laser ultrasonic to various internal defects by the fully non-contact LBUT. Experimental results for various artificial internal defects showed the usefulness of the LBUT in ablation regime in nondestructive testing (NDT) field.
Keywords :
displacement measurement; inspection; laser ablation; measurement by laser beam; rough surfaces; ultrasonic materials testing; ultrasonic waves; ablation regime; internal defects; laser ultrasonic inspection; laser-based ultrasonic technique; noncontact method; nondestructive testing; pulsed high-power laser; rough surface; two wave mixing detector; ultrasonic generator; Acoustics; Inspection; Laser ablation; Laser theory; Measurement by laser beam; Ultrasonic imaging; Ultrasonic variables measurement; ablation; internal defect inspection; laser ultrasonics; noncontact method;
Conference_Titel :
Nondestructive Evaluation/Testing (FENDT), 2014 IEEE Far East Forum on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4799-4731-7
DOI :
10.1109/FENDT.2014.6928234
