지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2017.4
- 수록면
- 107 - 112 (6page)
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초록· 키워드
오류제보하기
An adaptive optics system can be simulated or analyzed to predict its closed-loop performance. However,this type of prediction based on various assumptions can occasionally produce outcomes which are farfrom actual experience. Thus, every adaptive optics system is desired to be tested in a closed loop onan optical test bench before its application to a telescope. In the close-loop test bench, we need anatmospheric simulator that simulates atmospheric disturbances, mostly in phase, in terms of spatial andtemporal behavior. We report the development of an atmospheric turbulence simulator consisting of twopoint sources, a commercially available deformable mirror with a 12×12 actuator array, and two randomphase plates. The simulator generates an atmospherically distorted single or binary star with varying stellarmagnitudes and angular separations. We conduct a simulation of a binary star by optically combining twopoint sources mounted on independent precision stages. The light intensity of each source (an LED witha pin hole) is adjustable to the corresponding stellar magnitude, while its angular separation is preciselyadjusted by moving the corresponding stage. First, the atmospheric phase disturbance at a single instance,i.e., a phase screen, is generated via a computer simulation based on the thin-layer Kolmogorov atmosphericmodel and its temporal evolution is predicted based on the frozen flow hypothesis. The deformable mirroris then continuously best-fitted to the time-sequenced phase screens based on the least square method.
Similarly, we also implement another simulation by rotating two random phase plates which were manufacturedto have atmospheric-disturbance-like residual aberrations. This later method is limited in its abilityto simulate atmospheric disturbances, but it is easy and inexpensive to implement. With these two methods,individually or in unison, we can simulate typical atmospheric disturbances observed at the Bohyun Observatoryin South Korea, which corresponds to an area from 7 to 15 cm with regard to the Fried parameterat a telescope pupil plane of 500 nm.
목차
등록된 정보가 없습니다.
참고문헌 (21)
참고문헌 신청
J. M. Beckers / 1993 / Adaptive optics for astronomy: principles, performance, and applications / Annu. Rev. Astron. Astrophys 31:13~62
R. K. Tyson / 1990 / Adaptive optics system performance approximations for atmospheric turbulence correction / Opt. Eng 29:1165~1173
B. W. Frazier / 2004 / Performance of a compact adaptive-optics system / Appl. Opt 43:4281~4287
M. A. van Dam / 2004 / Performance of the keck observatory adaptive-optics system / Appl. Opt 43:5458~5467
B. L. Ellerbroek / 1994 / First-order performance evaluation of adaptive-optics systems for atmospheric-turbulence compensation in extended-field-of-view astronomical telescopes / J. Opt. Soc. Am. A 11:783~805
R. K. Tyson / 1990 / Adaptive optics system performance approximations for atmospheric turbulence correction / Opt. Eng 29:1165~1173
B. W. Frazier / 2004 / Performance of a compact adaptive-optics system / Appl. Opt 43:4281~4287
M. A. van Dam / 2004 / Performance of the keck observatory adaptive-optics system / Appl. Opt 43:5458~5467
B. L. Ellerbroek / 1994 / First-order performance evaluation of adaptive-optics systems for atmospheric-turbulence compensation in extended-field-of-view astronomical telescopes / J. Opt. Soc. Am. A 11:783~805
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