scholarly journals Large Space Telescopes Using Fresnel Lens For Power Beaming, Astronomy and Sail Missions

2003 ◽  
Author(s):  
James T. Early
Keyword(s):  
Fresnel Lens ◽  
Space Telescopes ◽  
Large Space ◽  
Power Beaming

Adaptive Solar Array Sun Shield and Heater for Large Space Telescopes

2022 ◽  
Author(s):  
Erika T. Bannon ◽  
Kevin Weed ◽  
J. Scott Knight ◽  
Laura Coyle ◽  
John Harvey ◽  
...  
Keyword(s):  
Solar Array ◽  
Space Telescopes ◽  
Large Space

scholarly journals Multi-beam array stitching method based on scanning Hartmann for imaging quality evaluation of large space telescopes

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Haisong Wei ◽  
Haixiang Hu ◽  
Feng Yan ◽  
Xindong Chen ◽  
Qiang Cheng ◽  
...  
Keyword(s):  
Quality Evaluation ◽  
Space Telescopes ◽  
Large Space ◽  
Imaging Quality ◽  
Beam Array

A Study of Computer Controlled Ultra-Precision Polishing of Silicon Carbide Reflecting Lenses for Enhancing Surface Roughness

2014 ◽  
Vol 625 ◽  
pp. 437-445 ◽  
Author(s):  
Zhuo Lin Li ◽  
Wing Bun Lee ◽  
Benny C.F. Cheung ◽  
L.T. Ho ◽  
Yue Gang Fu
Keyword(s):  
Surface Roughness ◽  
Silicon Carbide ◽  
Optical Quality ◽  
Optical Systems ◽  
Space Telescopes ◽  
Large Space ◽  
High Optical Quality ◽  
Ultra Precision ◽  
Important Means ◽  
Computer Controlled

Reflecting lens is an important component of optical systems, such as high-resolution cameras, large space telescopes and meteorological satellites etc. Among the lens materials, Silicon Carbide (SiC) has attracted a lot of attention as an important optical material because of its excellent mechanical and physical properties. Apart from the form accuracy, the attainment of a consistently high optical quality in polishing SiC is still of a concern. There are advanced ultra-precision polishing machines that can correct geometrical errors and surface finish of the workpiece. These include surface roughness and waviness. However, the hardness of SiC material itself put an challenge for polishing process. In this paper, A computer controlled ultra-precision polishing (CCUP) method based on mechanical polishing is used to produce the SiC lens. Experiments are being designed on a 7-axis ultra precision polishing machine (Zeeko IRP200). As it is difficult to find out slurry which is harder than SiC so that the conventional polishing slurry is be used. It provides a nice consequence that it also efficient when the polish powder is softer than the machined materials. The tool pressure, polishing head speed and the feed rate are varied and optimized to obtain the best reflectivity of the lens being polished. A pilot experiment will be conducted for the corrective polishing for the form error of the optical surface made of SiC. The result from the study will provide an important means to optimize the process for machining SiC reflective lens using the CCUP process.

Stretched membrane with electrostatic curvature (SMEC) mirrors for extremely large space telescopes

2001 ◽  
Author(s):  
Brian L. Stamper ◽  
James Roger P. Angel ◽  
James H. Burge ◽  
Tom Connors ◽  
Brian Duffy ◽  
...  
Keyword(s):  
Space Telescopes ◽  
Large Space

scholarly journals Imaging and Characterization of Extrasolar Planets with the Next Generation of Space Telescopes

Geosciences ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 442
Author(s):  
Ana I. Gómez de Castro
Keyword(s):  
Extrasolar Planets ◽  
Current Status ◽  
Next Generation ◽  
Special Issue ◽  
Space Telescopes ◽  
Large Space ◽  
Design Studies ◽  
Pros And Cons ◽  
Nm Range

The study and characterization of the exoplanets’ atmospheres and composition is in its infancy. The large facilities that will make feasible to image an exo-Earth are currently under study. This contribution to the special issue on “detection and characterization of extrasolar planets” is a summary on the current status of the design studies to build large space-based facilities working in the 100–3000 nm range for this purpose. The three basic designs: Fresnel imagers, starshades, and coronagraphs on large space telescopes are described. An outline of the pros and cons for each design is provided. The relevance of transmission spectroscopy to characterize exoplanets atmospheres is pointed out.

In-flight aberrations corrections for large space telescopes using active optics

2010 ◽  
Author(s):  
M. Laslandes ◽  
M. Ferrari ◽  
E. Hugot ◽  
G. Lemaitre
Keyword(s):  
Space Telescopes ◽  
Large Space ◽  
Active Optics
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