Application of the diffraction theory for photothermal deflection to measurements of thermophysical and mass-diffusion properties of gases

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DOIResolve DOI: http://doi.org/10.1140/epjst/e2008-00402-0
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TypeArticle
Journal titleThe European Physical Journal Special Topics
Volume153
Issue1
Pages99101; # of pages: 3
AbstractThe application of recently developed diffraction theory for cw transverse photothermal deflection spectroscopy (normal deflection only) to the measurements of thermophysical and mass-diffusion properties of gases is presented. Compared with the traditional ray-optics theory, the diffraction theory has one more term in the phase signal. This term quantitatively exhibits the probe-beam size effect on the phase signal. Experimental results demonstrated that even if the ratio of the probe-beam radius to the thermal diffusion length of a deflecting medium was as low as about 0.22, the probe-beam size effect could not be ignored when measuring the distance between the probe beam and a solid sample using the phase signal. With the measured distance, the thermal diffusivity αg and the temperature coefficient of the refractive index dn/dT of pure gases (O2, N2, and CO2) and binary gas mixtures (CO2-O2 and CO2-O2) were precisely measured, resulting in good agreement with literature values. Furthermore the measured dn/dT values of the pure gases had one more significant figure than the literature ones. The concentration dependences of αg and dn/dT were employed for the determination of mass-diffusion coefficients of CO2-O2 and CO2-N2, and the results were consistent with literature values.
Publication date
AffiliationNational Research Council Canada; NRC Institute for Fuel Cell Innovation
Peer reviewedNo
NPARC number8901061
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Record identifier80d5e076-f0e3-412e-a830-504854a34fb9
Record created2009-04-22
Record modified2016-05-09
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