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Irradiated Single Crystals for High Temperature Measurements in Space Applications

Published online by Cambridge University Press:  01 February 2011

Alex A. Volinsky ,
V. A. Nikolaenko ,
V. A. Morozov  and
V. P. Timoshenko
Alex A. Volinsky
Affiliation:
University of South Florida, Department of Mechanical Engineering, Tampa FL 33620USA, [email protected]; http://www.eng.usf.edu/~volinsky
V. A. Nikolaenko
Affiliation:
Russian Research Center “Kurchatov Institute”, Moscow, Russia 123182
V. A. Morozov
Affiliation:
Russian Research Center “Kurchatov Institute”, Moscow, Russia 123182
V. P. Timoshenko
Affiliation:
Molniya-T, Moscow, Russia 123459
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Abstract

While spacecrafts experience temperatures from -120 to 110°C on the orbit, their surface reaches extremely high temperatures, well above 1000 °C, during descent into the atmosphere due to aerodynamic heating. Sophisticated insulation systems are designed for thermal protection. One of the steps in designing a protection system is experimental temperature measurements.

Neutron flux induces point defects formation and accumulation in diamond and SiC single crystals, which causes overall lattice expansion. During thermal annealing this process is reversed, so the annealing temperature and time result in the “reduced” lattice parameter (measured by X-Ray diffraction), which allows determining the maximum temperature, if the exposure time is known. This paper describes the use of irradiated single crystal high temperature sensors for measuring temperatures in thermal protection systems during spacecraft descent, as well as other space applications. These additional applications include measuring the furnace temperature during single crystal growth in space at zero gravity, and measuring the rocket combustion chamber turbo pump temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 851: Symposium NN – Materials for Space Applications , 2004 , NN1.4
Copyright
Copyright © Materials Research Society 2005

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References

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