서지주요정보
레이저 Doppler 속도 간섭계에 의한 충격의 특성에 관한 연구 = Dynamical properties of impact measured by using laser doppler velocity interferometer
서명 / 저자 레이저 Doppler 속도 간섭계에 의한 충격의 특성에 관한 연구 = Dynamical properties of impact measured by using laser doppler velocity interferometer / 김재기.
저자명 김재기 ; Kim, Jai-Ki
발행사항 [서울 : 한국과학기술원, 1982].
Online Access 제한공개(로그인 후 원문보기 가능)원문

소장정보

등록번호

4001546

소장위치/청구기호

학술문화관(문화관) 보존서고

DAP 8202

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Laser Doppler velocimetry systems for measuring wave profiles in shock-loaded solids are critically reviewed with a comprehensive listing of all systems and a thorough examination of optical heterodyne principles. The diaphragm separating nitrogen gas at high pressure from one at low pressure is bursted and a shock wave travelling forward to the low pressure chamber and the rarefaction wave travelling back to the high pressure chamber are generated. In this experiment, the velocities of the shock waves are measured by two different methods; that of using pressure transducer and that of employing laser beam shear displacement. When He-Ne laser beam traverses the windows across the travelling shock wave, it is transversely displaced by the shock pressure induced tilt of the window plate, so that the laser beam coverage on the detector aperture changes. This change produces change in the output of the photodiode. In the present experiment, two pairs of windows separated by 10 cm give two separate photodiode outputs, and from the time intervals of two voltage signals, the velocity of shock wave is determined. The results obtained by this laser optical method accurately agree with those obtained from the method of using a pair of pressure transducers. A mild steel projectile (65.6 gm) with an elivated impact area (1.0cm in dia.) is driven to 25.6 m/sec by shock wave toward the fixed target plate with thickness 0.5-0.8 cm and the bulging deformation at the polished free surface is measured by using laser Doppler velocity interferometer. Initially thick target (1.2-2.4cm) is used for the determination of the velocity of the elastic wave in the solid. In the thinner targets, the free surface gets bulging plastic deformation. Its maximum bulging velocity, which is thickness dependent, are determined for the thickness 0.5-0.8 cm. It is found the maximum bulging velocity decreases approximately inversely with respect to the thickness of the target. and target thickness dependent behaviours of bulging plastic deformation of the mild steel target are obtained for the constant impact velocity and they are discussed on the basis of data obtained by using the laser Doppler velocity interferometer.

서지기타정보

서지기타정보
청구기호 {DAP 8202
형태사항 vi, 205 p. : 삽도, 사진 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jai-Ki Kim
지도교수의 한글표기 : 이상수
지도교수의 영문표기 : Sang-Soo Lee
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 199-204
주제 Impact.
Shock waves.
충격파. --과학기술용어시소러스
속도 측정. --과학기술용어시소러스
레이저 장치. --과학기술용어시소러스
도플러 효과. --과학기술용어시소러스
충격 효과. --과학기술용어시소러스
Laser doppler velocimeter.
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