Thermal measuring and testing – Determination of inherent thermal property – Thermal conductivity
Patent
1994-06-14
1996-12-24
Cuchlinski, Jr., William A.
Thermal measuring and testing
Determination of inherent thermal property
Thermal conductivity
73159, G01N 2518
Patent
active
055868240
ABSTRACT:
A metal or graphite fiber is suspended in a working fluid having a high refractive index change with the temperature and a modulated laser beam heats the fiber producing a synchronous thermal wave in the fiber whose amplitude and phase are measured by passing a probe laser beam through the liquid close to the fiber and converting the probe beam deflections into an electric signal. A theoretical model of the thermal wave is used to calculate the amplitude and phase shift of a theoretical thermal wave for points along the fiber from physical characteristics of the lasers and the fiber including an estimate of the thermal conductivity of the fiber. The straight line slope of the log amplitude or of the phase shift of the theoretical wave versus distance is compare against the straight line slope of the log amplitude or the phase shift versus distance for the electrical signal and the estimated value for the thermal conductivity of the fiber is adjusted until the theoretical slope and the electrical signal slope are the same which means that the thermal conductivity of the fiber has been found.
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Barkyoumb John
Kabacoff Lawrence T.
Land David J.
Cuchlinski Jr. William A.
Forrest John
Hirshfeld Andrew
Johnson Roger D.
The United States of America as represented by the Secretary of
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