서지주요정보
開口變調가 光學系 Optical transfer function에 미치는 影響 = Effect of aperture modulation on optical transfer function
서명 / 저자 開口變調가 光學系 Optical transfer function에 미치는 影響 = Effect of aperture modulation on optical transfer function / 洪京憙.
저자명 홍경희 ; Hong, Kyung-Hee
발행사항 [서울 : 한국과학기술원, 1980].
Online Access 원문보기 원문인쇄

소장정보

등록번호

4000746

소장위치/청구기호

학술문화관(문화관) 보존서고

DAP 8001

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

A photographic lens is evaluated by calculating the optical transfer function (OTF) from its design data and by measuring experimentally its OTF. Through the finite ray tracing, the wavefront aberration of the lens under test is obtained numerically to the second order for the extra axial object point and to the sixth order for the axial object point. The optical transfer function is then obtained as the auto-correlation of the pupil function. The computer calculation is carried out by using the mini computer NOVA 840 or FACOM 230-25 at the field angles 0˚, 7˚, 14˚, 21˚, and 28˚. In the experimental measurement of its OTF, the single slit object (4 ㎛ ×1cm) is placed on the optical axis and illuminated by mercury monochromatic light source. The image formed by the lens under test is scanned by the motorized knife edge and the data processed by a digital computer to obtain OTF. The MTF curves are obtained at F/2.8, F/4, and F/8 for the accurately focussed image and several defocussed ones, and then are compared with the theoretical curves. The OTF's of aperture modulated optical system, free from aberration, are investigated to examine their characteristic spatial frequency responses. In this work, the aperture modulation is carried out by providing an opaque annulus and/or an opaque and an opaque central disc. Those are all double annular apertures. Including the transmission band at s=O, we may say the double annular apertures provide three, four, or five frequency transmission bands throughout the whole frequency region within the cut-off frequency. The location and width of the broad frequency response peaks change as the aperture modulating conditions vary. The OTF's of the Tessar type photographic lens produced in Korea are extensively investigated. As the lens design data is known, both axial and off axial aberration characteristics are derived through computation. And the OTF is calculated for modulated aperture which are loaded with aberrations. The spatial frequency filtering properties differ greatly from those of aberration free modulated aperture. The OTF's of the lens are improved by properly positioning an opaque annulus. The performance of any optical system can be improved and specialized in optical uses by proper aperture modulation. The spatial frequency filtering property in aperture modulated lenses in the new special physical nature in addition to the coherent optical frequency analyzing feature of lenses.

서지기타정보

서지기타정보
청구기호 {DAP 8001
형태사항 v, 186 p. : 삽도, 수표 ; 26 cm
언어 한국어
일반주기 Appendix : A, Program for calculation of axial wave front aberration. - B, Program for off-axis wave frontaber-ration. - C, Program for OTF calculation from design data. - D, Program for data processing of OTF measurement.- E, Program for calculation of OTF andits extremal values
저자명의 영문표기 : Kyung-Hee Hong
지도교수의 한글표기 : 이상수
지도교수의 영문표기 : Sang-Soo Lee
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 181-185
주제 Lenses.
Aberration.
전달 함수. --과학기술용어시소러스
렌즈. --과학기술용어시소러스
수차 (광학). --과학기술용어시소러스
Transfer functions.
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