Temperature-dependent x-ray fluorescent response from thermographic phosphors under x-ray excitation
Abstract
Phosphor thermometry has been successfully applied within several challenging environments. Typically, the thermographic phosphors are excited by an ultraviolet light source, and the temperature-dependent spectral or temporal response is measured. However, this is challenging or impossible in optically thick environments. In addition, emission from other sources (e.g., a flame) may interfere with the optical phosphor emission. A temperature dependent x-ray excitation/emission could alleviate these issues as x-rays could penetrate obscurants with no interference from flame luminosity. In addition, x-ray emission could allow for thermometry within solids while simultaneously x-ray imaging the structural evolution. In this study, select thermographic phosphors were excited via x-ray radiation, and their x-ray emission characteristics were measured at various temperatures. Several of the phosphors showed varying levels of temperature dependence with the strongest sensitivity occurring for YAG:Dy and ZnGa2O4:Mn. This approach opens a path for less intrusive temperature measurements, particularly in optically opaque multiphase and solid phase combustion environments.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 19, 2021
- Source ID
- 10.1063/5.0053469
Entities
People
- Alan Kastengren
- Alex D. Brown
- Enrico C. Quintana
- Eric Westphal
- Kathryn N. Gabet Hoffmeister
- Steven F Son
- Terrence R Meyer
Organizations
- Air Force Office of Scientific Research
- Argonne National Laboratory
- National Aeronautics and Space Administration
- Office of Naval Research
- Purdue University
- Sandia National Laboratories