Results 261 to 270 of about 81,818 (284)

Single-acquisition wide-field superresolution for telescopes

Applied Optics, 2016
A simple optical setup is introduced here that is capable of improving the diffraction-limited angular resolution of a telescope at minimal cost to image quality. The system consists of, at minimum, an axicon and a convex lens located in the optical path of the telescope, which can increase the angular resolution by up to 38%.
Steve, Wereley, Yuxing, Zhang, Jian-Wei, Khor, Craig, Snoeyink   +3 more
openaire   +2 more sources

Construction of Wide Field Cryogenic Telescope

Experimental Astronomy, 2002
We constructed a wide field cryogenic telescope (WFCT) containing a whole Ritchey-Chretien system and a focal plane array in a cryostat for near infrared observations to cover the field of view of 0.4°. The telescope has a primary mirror of 220 mm and an engineering grade 256 × 256 InSb array.
Minoru Ando, Tetsuya Nagata, Shuji Sato, Makoto Watanabe, Kunio Itoh, Toshihide Kawai, Hidehiko Nakaya, Yoshiharu Namba, Takeshi Takezawa   +8 more
openaire   +1 more source

Wide-field telescope using spherical mirrors

SPIE Proceedings, 2003
A new class of optical telescope is required to obtain high resolution spectra of many faint, distant galaxies. These dim objects require apertures approaching 30 meters in addition to many hours of integration per object, and simultaneous observation of as many galaxies as possible.
Jim H. Burge, J. Roger P. Angel
openaire   +1 more source

OAJ: 2.6m wide field survey telescope

SPIE Proceedings, 2012
AMOS S.A. is in charge of the development of the telescopes for the "Observatorio Astrofisico de Javalambre" in Spain where a 2.6 m wide field telescope is complemented by an 80 cm telescope. This paper focuses on the 2.6 m telescope Javalambre Survey Telescope (JST): it is combining a large collecting surface with a wide field of view for reaching a
Olivier Pirnay, Vincent Moreau, Grégory Lousberg   +2 more
openaire   +1 more source

Wide field instrument preliminary design for the Wide Field InfraRed Survey Telescope

SPIE Proceedings, 2013
We present the Wide Field Infra-Red Survey Telescope (WFIRST) wide field instrument concept based on the reuse of a 2.4m telescope recently made available to NASA. Two instrument channels are described, a wide field channel (~0.8x0.4degrees, 300Mpix, imaging and spectroscopy over 0.76-2.0um), and an integral field unit (3x3 arcsec, 1Mpix, R{2pixel} ~
David A. Content, Nerses V. Armani, Charles L. Baker, Clifton E. Jackson, Duncan M. Kahle, Jeffrey W. Kruk, John P. Lehan, Mark E. Melton, Eric Mentzell, Joseph J. Miko, David J. Palace, Bert A. Pasquale, Hume L. Peabody, Brian S. Smith, Walter F. Smith, Jeffrey W. Stewart, David A. Vaughnn, Augustyn Waczynski, Thomas E. Wallace   +18 more
openaire   +1 more source

Wide field corrector for the KMTNet telescope

SPIE Proceedings, 2014
We present the design, assembly, alignment, and verification process of the wide field corrector for the Korea Microlensing Telescope Network (KMTNet) 1.6 meter optical telescope. The optical configuration of the KMTNet telescope is prime focus, having a wide field corrector and the CCD camera on the topside of Optical Tube Assembly (OTA).
Yongseok Lee, Sang-Mok Cha, Wade Poteet, Philip Lam, Chung-Uk Lee, Seung-Lee Kim, Byeong-Gon Park, Richard A. Buchroeder, Ho Jin   +8 more
openaire   +1 more source

Sensitivity analysis of a wide-field telescope

Journal of the Korean Physical Society, 2013
We are developing three ground-based wide-field telescopes. A wide-field Cassegrain telescope consists of two hyperbolic mirrors, aberration correctors and a field flattener for a 2-degree field of view. The diameters of the primary mirror and the secondary mirror are 500 mm and 200 mm, respectively.
Juhee Lim, Sangon Lee, Il Kweon Moon, Ho-Soon Yang, Jong Ung Lee, Young-Jun Choi, Jang-Hyun Park, Ho Jin   +7 more
openaire   +1 more source

Collimation of Fast Wide-Field Telescopes

Publications of the Astronomical Society of the Pacific, 1996
In this paper, I present a simple technique for collimating the secondary mirror of fast focal ratio wide-field Cassegrain telescopes. This technique minimizes both coma and astigmatism across the field. Because astigmatism is nearly zero on-axis even in a misaligned system, it is necessary to make measurements off-axis.
openaire   +1 more source

Three-mirror wide-field unobscured telescope designs

Annual Meeting Optical Society of America, 1987
Unobscured telescopes achieving a high degree of aberration correction over moderate fields of view have been studied by others.1 It is well known that for LWIR applications designs of diffraction-limited wide-field low-f/No. three-mirror telescopes can be achieved using general aspheric surfaces.
R. I. Mercado, L. D. Foo
openaire   +1 more source

Fast and compact wide-field Gregorian telescope

SPIE Proceedings, 2012
A traditional Gregorian telescope features an intermediate focus, which makes the system longer than an equivalent fnumber Cassegrain design. One could shorten the Gregorian system by inserting a flat mirror before the secondary mirror. We explore the potential of this compact configuration for sky survey imaging with relaxed requirements for ...
Mehdi Bahrami, Alexander V. Goncharov
openaire   +1 more source