Multistage wavefront control for a segmented primary mirror with annular-sector subaperture

2007 ◽  
Author(s):  
Bing Dong ◽  
Xin Yu
Keyword(s):  
Wavefront Control ◽  
Primary Mirror ◽  
Annular Sector

scholarly journals Filament-induced breakdown spectroscopy signal enhancement using optical wavefront control

2021 ◽  
pp. 126902
Author(s):  
L.A. Finney ◽  
J. Lin ◽  
P.J. Skrodzki ◽  
M. Burger ◽  
J. Nees ◽  
...  
Keyword(s):  
Signal Enhancement ◽  
Wavefront Control ◽  
Breakdown Spectroscopy

Thermal control of primary mirror of Space Solar Telescope

Optik ◽  
2021 ◽  
Vol 229 ◽  
pp. 166290
Author(s):  
Shuang Yang ◽  
Changshuai Du ◽  
Xianwei Yang ◽  
Chunlong Liu ◽  
Yan Xiong ◽  
...  
Keyword(s):  
Thermal Control ◽  
Solar Telescope ◽  
Primary Mirror ◽  
Space Solar Telescope

Thermally developing forced convection flow through porous concentric pipes annular duct

2021 ◽  
pp. 095440622110022
Author(s):  
Farhan Ahmed
Keyword(s):  
Flow Region ◽  
Axial Direction ◽  
Darcy Number ◽  
Convection Flow ◽  
Axial Distance ◽  
Cross Sectional ◽  
Developing Flow ◽  
Annular Sector ◽  
Flow Through ◽  
The Cross

This article shows the thermally developing flow through concentric pipes annular sector duct by describing the Darcy Brinkman flow field. The cross sectional convection-diffusion terms are transformed in power law discretized form by integrating over the differential volume, whereas backward difference scheme is used in the axial direction of heat flow. With the help of semi implicit method for pressure linked equations-revised ( SIMPLE-R), we get the solution of the governing problem. The graphs of velocity profiles against R and average Nusselt number against axial distance are plotted for different values of Darcy number and geometrical configuration parameters. It has been pointed out that velocity and thermal entrance length decrease, when we decrease the value of Darcy number. By decreasing the cross section of the concentric pipes annular sector duct in the transverse direction, thermally fully developed flow region develops earlier.

Phase change induced active metasurface devices for dynamic wavefront control

2020 ◽  
Vol 53 (20) ◽  
pp. 204001
Author(s):  
Shaolin Zhou ◽  
Yufei Wu ◽  
Shanri Chen ◽  
Shaowei Liao ◽  
Honglin Zhang ◽  
...  
Keyword(s):  
Phase Change ◽  
Wavefront Control

Perspectives on primary mirror figure control for a space-based optical telescope

2000 ◽  
Author(s):  
Douglas C. Neam ◽  
Paul A. Lightsey ◽  
James H. Crocker
Keyword(s):  
Optical Telescope ◽  
Primary Mirror
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