TITLE

Noncontact photothermal probe beam deflection measurement of thermal diffusivity in an unconfined hot gas

AUTHOR(S)
Loulergue, J. C.; Tam, A. C.
PUB. DATE
March 1985
SOURCE
Applied Physics Letters;3/1/1985, Vol. 46 Issue 5, p457
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A pulsed CO2 laser beam is used to produce a transient thermal refractive index gradient in a nitrogen gas doped with trace amounts of absorbing Freon 12 at temperatures from 25 to 425 °C. The diffusion of this gradient is probed by a continuous helium-neon laser beam parallel to but displaced from the pulsed beam. The observed defletion signal agrees well with theory, and thermal diffusivity or gas temperature can be derived from the signal.
ACCESSION #
9817192

 

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