Development of high-speed and wide-angle visible observation diagnostics on Experimental Advanced Superconducting Tokamak using catadioptric optics

2013 ◽  
Vol 84 (8) ◽  
pp. 085102 ◽  
Author(s):  
J. H. Yang ◽  
X. F. Yang ◽  
L. Q. Hu ◽  
Q. Zang ◽  
X. F. Han ◽  
...  
Keyword(s):  
High Speed ◽  
Wide Angle ◽  
Superconducting Tokamak

scholarly journals Design of Wide Angle and Large Aperture Optical System with Inner Focus for Compact System Camera Applications

2019 ◽  
Vol 10 (1) ◽  
pp. 179 ◽  
Author(s):  
Hojong Choi ◽  
Jaemyung Ryu
Keyword(s):  
Optical System ◽  
High Speed ◽  
Resolving Power ◽  
Wide Angle ◽  
Phase Detection ◽  
Half Angle ◽  
Stepper Motors ◽  
Angle Of View ◽  
Floating Type ◽  
Focusing Lens

Conventionally, a bright, very wide-angle optical system is designed as a floating type optical system that moves two or more lens groups composed of multiple lens in order to focus accurately. These have been widely used as phase detection auto focus (AF) methods within conventional digital single-lens reflex (DSLR) cameras. However, a phase detection AF optical system cannot be used when recording motion pictures. In contrast, a compact system camera (CSC) performs AF by the contrast method, where a stepper motor is used as the driving source for moving the optical lens. Nonetheless, to ensure that the focusing lens is lighter, these stepper motors should not have high torque and AF must be possible by moving only one lens. Yet, when focusing is performed with only one lens, aberration change due to focusing lens movement is magnified. Therefore, a very wide-angle optical system comprised of a half-angle of view more than 40 degrees and F of 1/4 has not been developed. Here, a very wide-angle optical system was designed with high resolving power that enables high speed AF, even in contrast mode, by moving only one lens while minimizing aberration change.

Mt. Dushak-Erekdag Observatory: A Chance to Close the Asian Gaps in WET Coverage

2003 ◽  
Vol 12 (2) ◽  
Author(s):  
T. N. Dorokhova ◽  
N. I. Dorokhov
Keyword(s):  
Soviet Union ◽  
Central Asia ◽  
Former Soviet Union ◽  
High Speed ◽  
Astronomical Observatory ◽  
Light Pollution ◽  
Wide Angle ◽  
International Programs ◽  
Low Light ◽  
Stable Economy

AbstractThe Mt. Dushak-Erekdag Observatory (Central Asia, Turkmenistan, 58° E longitude) is located just in the longitudes gap of asteroseismological networks. It is the southernmost observatory of the former Soviet Union, its latitude is +38°. The sky seeing at the site is one of the best in Central Asia: a low light pollution, high and stable sky transparency, over 200 usable nights per year. The altitude is above 2000 m.Odessa Astronomical Observatory has its 0.8 m telescope with a two-star high-speed photometer there, which frequently participates in international programs and multi-site campaigns. An accuracy of the photometry amounts to 1 mmag. Besides, a 1 m wide-angle telescope and a dual-tube telescope with 0.5m mirrors are installed at the observatory.The developed infrastructure at the site and the stable economy in Turkmenistan make the Mt. Dushak-Erekdag Observatory very interesting for the WET observations.

Filament identification in wide-angle high speed imaging of the mega amp spherical tokamak

2019 ◽  
Vol 90 (9) ◽  
pp. 093502
Author(s):  
T. Farley ◽  
N. R. Walkden ◽  
F. Militello ◽  
M. Sanna ◽  
J. Young ◽  
...  
Keyword(s):  
High Speed ◽  
Spherical Tokamak ◽  
Wide Angle ◽  
High Speed Imaging

scholarly journals On-Line Wide-Angle X-Ray Scattering Measurements During High-Speed Melt-Spinning of Poly(Ethylene Terephthalate) Fiber

2013 ◽  
Vol 62 (1) ◽  
pp. 8-12 ◽  
Author(s):  
Hirokazu NISHIMURA ◽  
Masaki SEI ◽  
Kenji CHIZUKA ◽  
Masato MASUDA ◽  
Hitoshi YAMAZAKI ◽  
...  
Keyword(s):  
High Speed ◽  
Melt Spinning ◽  
Ethylene Terephthalate ◽  
Wide Angle ◽  
X Ray ◽  
X Ray Scattering ◽  
Poly Ethylene Terephthalate ◽  
Scattering Measurements ◽  
On Line ◽  
Poly Ethylene
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