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Optical Engineering

Determination of thermal diffusivity of opaque materials using the photothermal mirror method
Author(s): Aristides Marcano; Gabriel Gwanmesia; Mark King; Daniel Caballero
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Paper Abstract

A pump-probe photothermal mirror (PTM) method has been developed to determine the thermal diffusivity of opaque solid samples. The method involves the detection of the distortion of a probe beam whose reflection profile is affected by the photoelastic deformation of a polished material surface induced by the absorption of a focused pump field. We have measured the time dependence of the PTM signal of Ti, Al, Cu, Sn, Ag, and Ni samples. We show theoretically and experimentally that the time derivative of the signal in the first microseconds is proportional to the square root of the thermal diffusivity coefficient. The method affords a simple calibration and efficient interpretation of experimental data for a sensitive determination of the thermal diffusivity coefficient for materials. We demonstrate the applicability of the technique by measuring the thermal diffusivities of wadsleyite (β-Mg2SiO4) and diopside (MgCaSi2O6), two important minerals relevant to geophysical studies.

Paper Details

Date Published: 8 December 2014
PDF: 6 pages
Opt. Eng. 53(12) 127101 doi: 10.1117/1.OE.53.12.127101
Published in: Optical Engineering Volume 53, Issue 12
Show Author Affiliations
Aristides Marcano, Delaware State Univ. (United States)
Gabriel Gwanmesia, Delaware State Univ. (United States)
Mark King, Delaware State Univ. (United States)
Daniel Caballero, Delaware State Univ. (United States)

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