• 한국컴퓨터산업학회논문지
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• 제2권12호
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• pp.1609-1616
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• 2001

본 논문에서는 체적 홀로그램을 이용한 무안경 3차원 디스플레이 시스템을 제안하였다. 디스플레이 평면에서 다시점 스테레오 영상을 관찰할 수 있도록 각 다중화된 기준파와 물체파를 간섭시킨 후 격자 패턴을 체적홀로그램에 기록하였다. 디스플레이 하고자 하는 다안식 영상으로 구성된 물체파가 시분할적으로 update 되며 광굴절 매질에 입사될 때 브래그 조건을 만족시키면, 출력 평면에서는 회절된 영상으로부터 다안식 3차원 영상을 관찰할 수 있다. 본 시스템을 이용함으로써 시점의 증가에 따른 해상도의 저하가 없는 고해상 다시점 3차원 디스플레이를 구성할 수 있다.

• 천문학회보
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• 제39권2호
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• pp.90-90
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• 2014

The Immersion Grating Infrared Spectrometer (IGRINS) is the first astronomical spectrograph that uses a silicon immersion grating as its dispersive element. IGRINS fully covers the H and K band atmospheric transmission windows in a single exposure. It is a compact high-resolution cross-dispersion spectrometer whose resolving power R is 40,000. An individual volume phase holographic grating serves as a secondary dispersing element for each of the H and K spectrograph arms. On the 2.7m Harlan J. Smith telescope at the McDonald Observatory, the slit size is $1^{{\prime}{\prime}}{\times}15^{{\prime}{\prime}}$. IGRINS has a plate scale of 0.27" pixel-1 on a $2048{\times}2048$ pixel Teledyne Scientific & Imaging HAWAII-2RG detector with a SIDECAR ASIC cryogenic controller. The instrument includes four subsystems; a calibration unit, an input relay optics module, a slit-viewing camera, and nearly identical H and K spectrograph modules. The use of a silicon immersion grating and a compact white pupil design allows the spectrograph collimated beam size to be 25mm, which permits the entire cryogenic system to be contained in a moderately sized ($0.96m{\times}0.6m{\times}0.38m$) rectangular Dewar. The fabrication and assembly of the optical and mechanical components were completed in 2013. From January to July of this year, we completed the system optical alignment and carried out commissioning observations on three runs to improve the efficiency of the instrument software and hardware. We describe the major design characteristics of the instrument including the system requirements and the technical strategy to meet them. We also present the instrumental performance test results derived from the commissioning runs at the McDonald Observatory.