Thermal Design to Meet Stringent Temperature Gradient/Stability Requirements of Space Camera’s Tube

Accurate thermal modeling for each part in the satellite is needed for achieving temperature gradients. The result of such a modeling will be the temperature gradients of each element of the satellite as a function of time. The aim of this paper is to present a new software which has been developed recently by the author at Space Research Laboratory for thermal analyzing of the satellites that is used to characterize the gradients of subsystems temperature as a function of time in space orbit. The software accomplishes accurate analysis of internal and external thermal loads of each part of the satellite and shows temperature gradients of each element. The purpose of designing this software is to create a useful application for thermal analysis of satellites, which is a helpful manner for testing satellite thermal subsystem. The most important usages of this software are designing thermal control subsystem, choosing proper equipment for thermal control subsystem and finding optimal configuration of satellite for having an ideal temperature gradient. The outputs of this software are validated by comparing them to a different thermal analyzing application.

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The Development of Zero-temperature-gradient Zero-bias Thermally Stimulated Current (ZTGZBTSC) Spectroscopy Technique for the Detection of Defect States in Ultra-thin High-k Dielectric Films

MRS Proceedings ◽

10.1557/proc-0917-e05-18 ◽

2006 ◽

Vol 917 ◽

Author(s):

Wai Shing Lau ◽

Kum Fai Wong ◽

Taejoon Han ◽

N. P. Sandler

Keyword(s):

Temperature Gradient ◽

Thermal Design ◽

Dielectric Films ◽

Zero Temperature ◽

Spectroscopy Technique ◽

Defect States ◽

Thermally Stimulated Current ◽

Zero Bias ◽

High K Dielectric ◽

High Dielectric

AbstractPreviously, we have reported our application of the zero-bias thermally stimulated current (ZBTSC) spectroscopy technique to study defect states in high-dielectric constant insulator films like tantalum oxide (Ta2O5) with much less parasitic current which can be a serious limitation for the conventional thermally stimulated current (TSC) method. However, a parasitic current can still be observed for ZBTSC because of a small parasitic temperature gradient across the sample. The thermal design of the ZBTSC system can be improved, resulting in zero-temperature-gradient ZBTSC (ZTGZBTSC) which can be used to detect deeper traps than ZBTSC.

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Thermal design to meet stringent temperature gradient/stability requirements of SWIFT BAT detectors

10.2514/6.2000-2905 ◽

2000 ◽

Cited By ~ 6

Author(s):

Michael Choi

Keyword(s):

Temperature Gradient ◽

Thermal Design

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Thermal design to meet stringent temperature gradient/stability requirements of SWIFT BAT detectors

Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022) ◽

10.1109/iecec.2000.870806 ◽

2002 ◽

Cited By ~ 1

Author(s):

M.K. Choi

Keyword(s):

Temperature Gradient ◽

Thermal Design

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Three Mirrors Aberrations Optical Transform Function with the Thermal Elastic Deformation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.143-144.181 ◽

2011 ◽

Vol 143-144 ◽

pp. 181-184

Author(s):

Yu Fan ◽

Xue Feng Wu

Keyword(s):

Temperature Gradient ◽

Optical System ◽

Optical Design ◽

Thermal Design ◽

Optical Analysis ◽

Axial Temperature Gradient ◽

Axial Temperature ◽

Design Software ◽

Temperature Loads ◽

Optical Transform

The field angle of TMA (three mirrors aberration) optical system is larger than coaxial optical system and more susceptible to the structure deformation. Thermal optical analysis is proposed for evaluating the optical MTF (module transform function). Temperature loads, such as X axial, Y axial and Z axial temperature gradients, are put on the optical system. The thermal elasticity deformations of reflector mirror surfaces made by frame deformation are computed. The deformations of reflector mirror surfaces are expressed in Zernike polynomial. With the optical design software optical MTF is computed. The results show that the X axial temperature gradient causes the MTF of optical system reduced furthest, the Y axial temperature gradient causes the minor MTF change, and the Z axial temperature gradient causes the least change of MTF. The research jobs could give some guidance and reference for the thermal design for TMA optical system.

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