서지주요정보
Nematic 액정을 이용한 위상변조기의 제작과 digital twyman-green 간섭계에의 응용연구 = Nematic liquidcrystal phase shifter and its application for digital twyman-green interferometry
서명 / 저자 Nematic 액정을 이용한 위상변조기의 제작과 digital twyman-green 간섭계에의 응용연구 = Nematic liquidcrystal phase shifter and its application for digital twyman-green interferometry / 장도일.
저자명 장도일 ; Chang, Do-Il
발행사항 [대전 : 한국과학기술원, 1993].
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소장정보

등록번호

8003550

소장위치/청구기호

학술문화관(문화관) 보존서고

MPH 93024

SMS전송

도서상태

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초록정보

A phase shifter is useful for digital interferometers. The phase shifter was designed and fabricated in this work by using liquid crystal(LC) which has merits of lower working voltage and lower power consumption than any other phase shifter such as PZT. Aberrated optical wavefront was reconstructed by computer analyses in digital Twyman-Green interferometry through the use of LC phase shifter made in this experiment. The LC phase shifter was made with nematic liquid crystal ZLI-2244-100(Merck) and BK-7 glass substrate which was coated with transparent electrode (ITO). Skyrol film (SKC : 12 μm) was used as a spacer. Threshold voltage for Freedericksz transition was measured to be 3.27 vots which was peak amplitude voltage at 2kHz square wave and from this value the splay constant, $K_1$, could be obtained to be $2.7\times10^{-7}dyne$. Voltages for phase shifting 0, π/2, π, 3π/2, and 2π were selected as 4.047, 4.433, 4.932, 5.601, and 6.459 volts respectively. In digital Twyman-Green interferometry the optical path difference between the two interfering wavefronts was changed by controlling the voltage to LC phase shifter. The wavefronts of the reference and the test mirrors were obtained from the 5 digitized interferograms at each phase shifting steps. 3 dimensional reconstruction of wavefronts were reconstructed by Zernike polynomial fittings and removing tilt components.

서지기타정보

서지기타정보
청구기호 {MPH 93024
형태사항 [iii], 66 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Do-Il Chang
지도교수의 한글표기 : 공홍진
지도교수의 영문표기 : Hong-Jin Kong
학위논문 학위논문(석사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 62-66
주제 Interferometers.
Phase shifters.
Liquid crystals.
Twyman-Green 간섭계. --과학기술용어시소러스
위상 변조. --과학기술용어시소러스
액정. --과학기술용어시소러스
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