A novel strategy to improve the sensitivity of aerosol phosphor thermometry using co-doped phosphors |
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| Institution: | 1. Institute of Combustion Technology, German Aerospace Center (DLR), 70569 Stuttgart, Germany;2. Laboratory for Femtochemistry and Synchrotron Radiation, Paul Scherrer Institute, CH-5232 Villigen, Switzerland;3. Mass Spectrometry in Reactive Flows – Thermodynamics (IVG), University of Duisburg-Essen, 47057 Duisburg, Germany;1. School of Aerospace Mechanical and Mechatronic Engineering, University of Sydney, Level 4, Mechanical Engineering Building J07, NSW 2006, Australia;2. School of Mechanical Engineering, Purdue University, West Lafayette, IN 47906 USA;1. Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551, USA;2. Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA;3. X-Ray Sciences Division, Argonne National Laboratory, Argonne, IL 60439, USA |
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| Abstract: | A novel strategy is presented to improve the temperature sensitivity and potentially extend the temperature range of aerosol phosphor thermometry (APT) by co-doping host materials with two rare-earth ions. The ratio of the emission bands from each ion are measured and calibrated versus temperature to utilize the high sensitivity of thermographic phosphor absolute signal levels. The potential of the technique is illustrated using trivalent cerium (Ce3+) and praseodymium (Pr3+) co-doped into yttrium aluminum garnet (Ce,Pr:YAG). The measured fractional sensitivity of this phosphor from 300–450 K was 0.004–0.006 K−1, a factor of 1.5–2 better than previously observed for Eu:BAM. Additionally, the single-shot precision (1σ) was between 9 and 25 K over the range of temperatures measured, illustrating the utility of this co-doping strategy. The level of temperature sensitivity and single-shot precision observed here should be achievable over different temperature ranges by doping Ce3+ and Pr3+ into different hosts. This new strategy should provide a pathway to ultimately extend the high-temperature single-shot measurement limit for APT to temperatures greater than 1000 K and push forward the state-of-the-art for planar temperature diagnostics in combustion applications. |
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