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The strong influence of heat losses on the accurate measurement of thermal diffusivity using lock-in thermography
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10.1063/1.3236782
/content/aip/journal/apl/95/12/10.1063/1.3236782
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/12/10.1063/1.3236782

Figures

Image of FIG. 1.
FIG. 1.

Geometry of the problem, indicating the heat fluxes at each surface.

Image of FIG. 2.
FIG. 2.

Simulation of the radial dependence of the natural logarithm of the temperature amplitude multiplied by and of the phase for a thermally thick sample. Without heat losses (continuous line), with conduction to the gas (dashed line). Data: , , , , , and .

Image of FIG. 3.
FIG. 3.

Simulation of the radial dependence of the natural logarithm of the temperature amplitude multiplied by and of the phase for a thermally thin sample. Without heat losses (continuous line), with conduction to the gas (dashed line), and with the combined effect of conductive, convective, and radiative losses (dotted line). Data: , , , , , , , and . In dots, experimental data obtained at room pressure for a thick PEEK film (, ).

Image of FIG. 4.
FIG. 4.

Thermal diffusivity dependence on air pressure for a thick PEEK film . The continuous line represents the simulation from Eq. (3) by taking into account the pressure dependence of . The dashed line represents the simulation neglecting the conduction to the gas.

Tables

Generic image for table
Table I.

Thermal diffusivity . Uncertainty: ±5%.

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/content/aip/journal/apl/95/12/10.1063/1.3236782
2009-09-23
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The strong influence of heat losses on the accurate measurement of thermal diffusivity using lock-in thermography
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/12/10.1063/1.3236782
10.1063/1.3236782
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