Results 151 to 160 of about 714 (189)

Dynamic analysis of a segmented telescope testbed

1997 European Control Conference (ECC), 1997
This paper describes the control analysis and simulation of a test rig currently being designed within the Gran Telescopio Canarias (GTC) project. This project is now in the preliminary stage of development and consists in designing a very large optical and infrared telescope with a segmented primary mirror in the range of 10+ meters in diameter.
J. M. Fuertes, S. de Miguel, R. Villa, J. C. Gonzalez, J. Castro   +4 more
openaire   +1 more source

Laser Guide Star for Segmented Telescopes

2001
We present an application of laser guide star for the alignment of segmented mirror telescopes. A combination of curvature and Shack—Hartmann wavefront sensors permits to detect the local piston and tilt errors of the elements of the primary mirror. We also achieve, with these sensors, the distortion of the wavefront due to atmospheric turbulence.
J. M. Rodríguez-González, J. J. Fuensalida, J. M. Rodríguez-Ramos   +2 more
openaire   +1 more source

Design and production of segment mirrors for the large-sized telescopes of the Cherenkov Telescope Array

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 2020
CTA (Cherenkov Telescope Array) is a project for the next generation of the ground-based gamma-ray observatory. CTA will cover a wide energy range, 20 GeV and 300 TeV, by 3 types of the telescopes whose diameters are different. The Large-Sized Telescopes (LSTs) of the CTA are designed to cover the lowest energy range.
Tomohiro Inada, Satoshi Fukami, Koji Noda, Michiyuki Chikawa, Mika Kagaya, Hideaki Katagiri, Daniel Mazin, Koutaro Obara, Akira Okumura, Takayuki Saito, Masahiro Teshima, Tokonatsu Yamamoto, Tatsuo Yoshida, Ievgen Vovk   +13 more
openaire   +1 more source

Aberration Correction In A Telescope With A Segmented Primary

SPIE Proceedings, 1989
In a Cassegrain telescope with a segmented primary mirror, wavefront aberrations are introduced by segment figure errors, segment positioning errors, secondary figure errors, and secondary positioning errors. We give here an analytic description of these errors. The various sources contribute different aberrations to the wavefront.
Jerry Nelson, Terry Mast, Gary Chanan
openaire   +1 more source

Real-time control of a segmented telescope test-bed

42nd IEEE International Conference on Decision and Control (IEEE Cat. No.03CH37475), 2004
The control of large segmented telescopes is a challenging one due to the complexity and high order of the system. The high order dynamics lead to high order controllers that require more memory and faster computations for implementation. While this may not pose a serious problem for a small number of segments, as the number of segments increases the ...
Ali A. Abdullah, Petros A. Ioannou
openaire   +1 more source

Geostationary Earth Observation Satellite with Large Segmented Telescope

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
To mitigate human damage by a catastrophic disaster, such as Great East Japan Earthquake and Tsunami happened in 2011, a quick satellite observation and data distribution are the keys to recognize damaged area and make plans to rescue. Geosynchronous orbit is the best solution to provide an instantaneous observation from the occurrence of the disaster.
Toshiyoshi Kimura, Tadahito Mizutani, Yoji Shirasawa, Michito Sakai, Ayaka Kumeta, Seichi Sato, Norihide Miyamura, Akira Iwasaki   +7 more
openaire   +1 more source

Mathematical and Computer Model for Designing Telescope with Segmented-Mirror

International Optical Design, 2006
Mathematical and computer modeling of a segmented system are designed and applied to a telescopic system. Segment results are discussed and image quality of the design based on these results is evaluated in this paper.
Dewen Cheng, Yongtian Wang, Jun Chang, M. M. Talha   +3 more
openaire   +1 more source

Segmented optics for large space telescopes

AIAA Defense and Civil Space Programs Conference and Exhibit, 1998
Segmented optics provide the greatest growth potential for the large astronomical telescopes of interest for future space missions, but efficient utilization of their benefits will require a fully integrated active system and radically new design paradigms.
openaire   +1 more source

Optimization of the performance of segmented-telescopic penetrators

AIP Conference Proceedings, 1998
The performance of segmented-telescopic penetrators is investigated in this numerical study. It is shown that the penetration depth of single segmented-telescopic penetrators impacting a semi-infinite target is exceptional. However, the penetration depth of multiple segment trains can be marginal; the degradation in performance is a result of segment ...
openaire   +1 more source

Production of 8.4m segments for the Giant Magellan Telescope

SPIE Proceedings, 2012
Production of segments for the Giant Magellan Telescope is well underway at the Steward Observatory Mirror Lab. We report on the completion of the first 8.4 m off-axis segment, the casting of the second segment, and preparations for manufacture of the remaining segments.
H. M. Martin, R. G. Allen, J. H. Burge, D. W. Kim, J. S. Kingsley, K. Law, R. D. Lutz, P. A. Strittmatter, P. Su, M. T. Tuell, S. C. West, P. Zhou   +11 more
openaire   +1 more source