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Digitale Medien

Effects of detector nonlinearity and specimen size on the apparent thermal diffusivity of NIST 8425 graphite (1990)

Hasselman, D. P. H. ; Donaldson, K. Y.

Springer

International journal of thermophysics 11 (1990), S. 573-585

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ISSN: 1572-9567

Schlagwort(e): detector nonlinearity ; graphite ; laser-flash method ; standard materials ; thermal diffusivity

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract With the use of a graphite thermal conductivity standard it is demonstrated that optical detector non-linearity, coupled with excessive laser pulse energies, is primarily responsible for the anomalous specimen size dependence of the thermal diffusivity measured by the laser-pulse technique. High laser pulse energies also result in an anomalous positive temperature dependence for thin specimens near room temperature, in contrast to the expected negative temperature dependence. Using moderately thick specimens and attenuated laser pulses yields excellent agreement with thermal diffusivity calculated from standard thermal conductivity data.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00500847

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