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김경석(Koungsuk Kim),강기수(Kisoo Kang),윤철성(Chulsung Yoon),양승필(Seungphil Yang) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
In recent years, shearogrpahy has significantly improved capabilities in the areas of unbond and<br/> separation detection in tires. Although shearography has many advantages for qualitative evaluation, the<br/> technique remains the problem of quantitative analysis of inside defects, because shearography needs<br/> several effective factors including the amount of shearing, shearing direction and induced load, which<br/> exist as barrier for the quantitative analysis of inside defects. Since the factors are highly dependent on<br/> inspectors skill and also affect the in-situ workability. The factors were optimized and the size of<br/> cracks inside of pipeline and tire has been quantitatively determined.
Shearography의 1차도함수로부터 면외변위의 정량적 추출
김경석(Koungsuk Kim),윤홍석(Hongseok Yoom),박찬주(Chanju Park),최정석(Jungsuk Choi) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The paper describes the quantitative determination of out-of-plane displacement from result of Shearogrpahy, which can measure the first-order partial derivative of out-of-plane displacement directly. However, the differential sensitivity of Shearography is related to the amount of shearing, which is manually adjustable in optical interferometer and affects the quantitative determination. The relationship between those is inspected by comparing ESPI with Shearography. From the result, the amount of shearing plays a modulation factor of out-or-plane displacement and small amount of shearing gives good agreement with out-of-plane displacement.
Time Average ESPI 와 Euler-Bernoulli 방정식에 의한 탄성계수 측정
김경석(Koungsuk Kim),강기수(Kisoo Kang),이항서(Hangseo Lee),강영준(Youngjun Kang) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.7
The paper proposes a new sonic resonance test for a elastic modulus measurement which is based on time-average electronic speckle pattern interferometry(TA-ESPI) and Euler-Bernoulli equation. Previous measurement technique of elastic constant has the limitation of application for thin film or polymer material because contact to specimen affects the result. TA-ESPI has been developed as a non-contact optical measurement technique which can visualize resonance vibration mode shapes with whole-field. The maximum vibration amplitude at each vibration mode shape is a clue to find the resonance frequencies. The dynamic elastic constant of test material can be easily estimated from EulerBernoulli equation using the measured resonance frequencies. The proposed technique is able to give high accurate elastic modulus of materials through a simple experiment set up and analysis.
ESPI와 Pulse ESPI를 이용한 모형교량의 거동해석
김경석,백상규 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.2
본 논문에서는 현재 건축물의 안전진단에 있어서 스트레인 게이지 기법과 가속도계법이 널리 사용되고 있다. 아무리 이 방법들이 잘 알려져있더라도 제한을 받는다. 그러나 ESPI와 Pulse ESPI는 비접촉, 전면검사, 실시간적인 중요한 검사방법이다. 특별히 Pulse ESPI방법은 외란에 둔감하고 아주 짧은 시간내에 검사를 마칠 수 있다. 이 기법은 다양한 piont 방식의 응용과 설치가 빠르며 Laser가 조사되는 전면에 대한 동적거동 해석이 용이 하다. 이 논문은 기존 안전진단기술의 한계를 보완하여 새로운 방안을 제시 할 수 있을 것이다. At present strain gage technique and accelerometer are used widely for the diagnosis safety of constructions. However, the limits of these methods are revealed. But ESPI(Electronic Speckle Pattern Interferometry) and Pulse ESPI is noncontact. whole-field, real-time measuring method. Especially Pulse ESPI method is insensitive to disturbance and can achieve test result in a very short time. It has various strong points in spot application, swift establishment, and dynamic conduct analysis for the entire field of Laser illumination. In this paper a new approach for safety diagnosis on bridges based on speckle interferometry techniques is presented.