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5/16/2017  |   3:55 PM - 4:20 PM   |  3

Mapping of the Thermal Properties and Molecular Bonding of Ceramic Materials via Complementary Raman Scanning Thermal Microscopy (CRSThM)

This project will extend the capability of a Raman instrument to provide information on molecular bonds and also measure the local thermophysical properties (such as thermal conductivity) of ceramic materials. This Complementary Raman Scanning Thermal Microscope (CRSThM) would allow a map of the chemical composition of solid samples to be superimposed on a map of the thermophysical properties. The CRSThM is a modified Raman microscope with a temperature control stage that retains microscopy functionality, with the potential to add a fiber optic probe for remote sensing. Additionally, a long wavelength IR laser will be added to the system to provide local pulsed or modulated heating, from which thermophysical properties can be determined. To determine local thermophysical properties (such as thermal conductivity and diffusivity), thermal wave techniques are used where modulated heating from a laser at a fixed frequency causes variations in the material’s temperature. Because the Raman spectra is function of temperature, locking-in to variations in the Raman spectra that occur at the modulation frequency greatly improves the signal-to-noise ratio of the temperature signal. Thermal wave models can then be used to determine the thermal property of the material at the point of laser irradiation. The ability to spatially resolved thermophysical properties does exist, but coupling the thermophysical property data to what chemical species is present at specific locations is of interest with nuclear materials by allowing for accurate quantification of fission product effect on the property as a function of fuel burnup.

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Troy Munro (Primary Presenter), BYU,;

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