Adsorption cryogenic vacuum pumps with sorbent elements based on zeolite and cooper powders

2020 ◽  
Author(s):  
P. A. Kuznetsov ◽  
A. O. Prostorova ◽  
V. P. Tretyakov ◽  
M. V. Yakovitskaya
Keyword(s):  
Cryogenic Vacuum

Cryogenic Vacuum Testing of Lunar Rover Drivetrain

2018 ◽  
Author(s):  
Perry Edmundson ◽  
Peter Visscher ◽  
Josh Newman ◽  
Joseph O’Connell ◽  
Martin Picard
Keyword(s):  
Lunar Rover ◽  
Cryogenic Vacuum ◽  
Vacuum Testing

scholarly journals Surface Measurement of a Large Inflatable Reflector in Cryogenic Vacuum

Photonics ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
Henry Quach ◽  
Hyukmo Kang ◽  
Siddhartha Sirsi ◽  
Aman Chandra ◽  
Heejoo Choi ◽  
...  
Keyword(s):  
Shape Change ◽  
Pressure Change ◽  
Membrane Properties ◽  
Surface Measurement ◽  
Membrane Structures ◽  
Thermal Vacuum ◽  
Pixel Resolution ◽  
Optical Surfaces ◽  
Cryogenic Vacuum ◽  
Initial Measurement

The metrology of membrane structures, especially inflatable, curved, optical surfaces, remains challenging. Internal pressure, mechanical membrane properties, and circumferential boundary conditions imbue highly dynamic slopes to the final optic surface. Here, we present our method and experimental results for measuring a 1 m inflatable reflector’s shape response to dynamic perturbations in a thermal vacuum chamber. Our method uses phase-measuring deflectometry to track shape change in response to pressure change, thermal gradient, and controlled puncture. We use an initial measurement as a virtual null reference, allowing us to compare 500 mm of measurable aperture of the concave f/2, 1-meter diameter inflatable optic. We built a custom deflectometer that attaches to the TVAC window to make full use of its clear aperture, with kinematic references behind the test article for calibration. Our method produces 500 × 500 pixel resolution 3D surface maps with a repeatability of 150 nm RMS within a cryogenic vacuum environment (T = 140 K, P = 0.11 Pa).

Increasing Ice Collection Rates on Engineered Cold Plate under Cryogenic Vacuum Conditions

2021 ◽  
Author(s):  
Nathaniel I. Jurado ◽  
Aaron D. Amato ◽  
Priscilla A. Mendoza ◽  
Emmanuel Negron-Ortiz ◽  
Itzel A. Torres ◽  
...  
Keyword(s):  
Cold Plate ◽  
Cryogenic Vacuum

Hydrogen Sensor for Cryogenic Vacuum Objects

2002 ◽  
pp. 41-47 ◽  
Author(s):  
A. L. Gusev ◽  
V. M. Belousov ◽  
I. V. Bacherikova ◽  
L. V. Lyashenko ◽  
E. V. Rozhkova
Keyword(s):  
Hydrogen Sensor ◽  
Cryogenic Vacuum

Measurement method of the wave front aberration of optical system in cryogenic vacuum environment

2018 ◽  
Vol 47 (7) ◽  
pp. 717004
Author(s):  
阴刚华 Yin Ganghua ◽  
栗孟娟 Li Mengjuan ◽  
李 凌 Li Ling ◽  
金忠瑞 Jin Zhongrui ◽  
王兆明 Wang Zhaoming ◽  
...  
Keyword(s):  
Wave Front ◽  
Optical System ◽  
Measurement Method ◽  
Cryogenic Vacuum

Measurement of the accumulation of water ice on optical components in cryogenic vacuum environments

2012 ◽  
Author(s):  
Trevor M. Moeller ◽  
L. Montgomery Smith ◽  
Frank G. Collins ◽  
Jesse M. Labello ◽  
James P. Rogers ◽  
...  
Keyword(s):  
Optical Components ◽  
Water Ice ◽  
Cryogenic Vacuum
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