Non-contact Measurement of Elastic Modulus by using Laser Ultrasonic
http://link.springer.com/article/10.1007/s12541-015-0118-x
Non-contact measurement of elastic modulus by using laser ultrasound
Abstract
Non-contact measurement of elastic modulus is necessary for the in-line assessment of material in harsh environments such as high temperature. In this paper, a fully non-contact method to measure elastic modulus is proposed based on the laser ultrasonic technique (LUT) that uses a short-pulsed laser to generate ultrasound and the other laser coupled to an interferometer using a photorefractive crystal to detect the ultrasonic wave displacement. Basically, this method measures velocities of shear wave and longitudinal wave to obtain the elastic modulus. The uniqueness is that the velocity of shear wave is measured in the thermo-elastic regime first and then the velocity of longitudinal wave is measured in the ablation regime. This is because the strong mode of generated ultrasound is the shear wave in the thermo-elastic regime while the longitudinal wave in the ablation regime. Regime change can be achieved simply by switching the laser power, with no change in the measurement setup. In order to demonstrate the usefulness of the proposed method, the elastic modulus of aluminum casting alloy has been measured and the results were compared with a conventional contact method and a destructive tensile test. They showed good agreement with each other, which verified the usefulness of the proposed noncontact elastic modulus measurement method.
Keywords
Elastic modulus Laser ultrasound Non-contact Non-destructive분류 | 제목 | 조회 수 |
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Award | 2016 글로벌박사 펠로우십 (Global Ph.D. Fellowship) 1건 선정 - 서호건 (박사과정) | 65105 |
Award | JMST - JMST Contribution Award | 66229 |
Award | 2015 산업부장관 표창 | 67610 |
Award | 대한기계학회 - 우수 학생 논문상 | 66699 |
Award | 비파괴검사학회지 - 우수논문상 | 67799 |
Award | 한국도로공사 교통데이터 공모전 - 대한교통학회 회장상 수상 (김진수) | 114442 |
Award | 비파괴검사학회지 - 우수 논문상 | 71611 |
Award | 한국ITS학회 - 우수논문상 | 77768 |
Award | Best Poster Award, 3rd International Symposium on Laser Ultrasonics and Advanced Sensing (Sungho Choi) | 95782 |
Award | Best Student Poster Presentation Award: FIRST PRIZE, 9th FEOFS (Sung-ho Choi) | 111896 |
Award | 2013 글로벌박사펠로우십 신규 사업 2 건 최종 선정 (박사과정 김진수, 석박통합과정 서호건) | 139672 |
Award | 비파괴검사학회지 우수 논문상 (김정석, 남태형, 최성호, 장경영) | 79785 |