About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Spectroscopic Methods and Analysis for Nuclear Energy Related Materials
|
| Presentation Title |
Understanding Temperature in Extreme Conditions |
| Author(s) |
Tiffany Y. McHenry, Donald Brown, Matthew Kerr, Don Lipkin |
| On-Site Speaker (Planned) |
Tiffany Y. McHenry |
| Abstract Scope |
Accurate temperature measurement of high-temperature materials remains a fundamental challenge in thermal metrology due to the inherent coupling between emissivity and temperature in pyrometric measurements. Since most real materials exhibit non-gray behavior, the gray-body emissivity assumption can introduce significant uncertainty in brightness temperature measurements. This work investigates spectroscopic approaches for the simultaneous determination of temperature and emissivity through optimization of physically constrained emissivity models that require no prior knowledge of a material's emissivity. Spectral radiance measurements acquired over a broad wavelength range are analyzed using Planck-based radiative transfer models coupled with parameterized emissivity representations for well-characterized materials. Temperature estimates obtained from spectroscopic measurements will be independently validated through X-ray diffraction (XRD) at the synchrotron, where lattice parameters will be measured and correlated with temperature using established thermal expansion relationships. By combining spectroscopic diagnostics with diffraction-based thermometry, this methodology aims to improve temperature accuracy for non-gray materials in extreme environments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, High-Temperature Materials, Modeling and Simulation |