Combustion-relevant aerosol phosphor thermometry imaging using Ce,Pr:LuAG, Ce:GdPO4, and Ce:CSSO

Herzog, Joshua; Witkowski, Dustin; Rothamer, David

doi:10.1016/j.proci.2020.06.193

Cited by 9 publications

(11 citation statements)

References 12 publications

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“…As noted in [2], Ce:CSSO exhibits a significant amount of host defect emission when excited at 266 nm. To reduce interference and better observe the photophysical properties of the rare-earth ions, the Ce:CSSO and Ce,Pr:CSSO phosphor samples were annealed.…”

Section: Experimental Methods and Materialsmentioning

confidence: 58%

“…Singly-doped Pr:CSSO has the brightest emission (before quenching), while Ce 3+ in general has the lowest roomtemperature signal. However, Ce 3+ emission increases up to 950 K and does not quench significantly until 1200 K, making its signal intensity the strongest at temperatures >700 K. In fact, for both the singly-doped and co-doped phosphors the Ce 3+ signal is higher than its room temperature value until at least 1100 K. Therefore, is a viable option for temperature imaging above 1000 K as previously demonstrated for the singlydoped Ce:CSSO [2]. Interestingly, the co-doped and singlydoped Ce 3+ emission intensities are similar above 1000 K after the host and Pr 3+ emissions have quenched significantly.…”

Section: Relative Signalmentioning

confidence: 73%

“…The mass density of the phosphor materials is assumed to be equal to that of the host, which is approximately 3510 kg m −3 [15]. Heat capacity is assumed to be the same for each sample as well, and was measured and presented in [2], where the Debye temperature was found to be 878 K and the Dulong-Petit heat capacity is 1020 J (kg•K) −1 ; these values will be used later to quantify intrusiveness for performance estimates.…”

Section: Experimental Methods and Materialsmentioning

confidence: 99%

“…Room temperature lifetime, estimated room temperature signal per particle (for 1.4 µm particle diameter), and 50% quenching temperatures (based on both lifetime and signal) for Ce 3 + and Pr 3 + in CSSO. Signal per particle is estimated from the relative emission intensity at room temperature, scaled by the signal per particle value for annealed Ce:CSSO (Ce 3 + ) from [2]. emission from 3+ , and to a certain extent Ce 3+ , makes it impossible to come to definitive conclusions from the data presented here.…”

Section: Relative Signalmentioning

confidence: 99%

“…Namely, Ce 3+ emission intensity is not strongly temperature-sensitive at temperatures less than 1000 K, limiting the range of measured temperatures. In [2], host defect emission was used in combination with Ce 3+ emission in a host-referenced APT approach to provide temperature measurements between 600 and 800 K, but this was still not sufficient to provide a continuous temperature measurement throughout the entire 300-1400 K range. Additionally, no detailed characterization of the Ce:CSSO phosphor for thermometry was available to aid in experiment design, although previous measurements indicated there is no significant thermal quenching until at least 860 K [4].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Ce:CSSO, Pr:CSSO, and co-doped Ce,Pr:CSSO phosphors for aerosol phosphor thermometry

Herzog¹,

Witkowski²,

Rothamer³

2021

Meas. Sci. Technol.

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The phosphor Ce:Ca3Sc2Si3O12(Ce:CSSO) was recently investigated for aerosol phosphor thermometry (APT) and shown to be capable of temperature imaging up to at least 1400 K. To date, no thorough characterization of the temperature dependent emission properties of the phosphor has been performed up to 1400 K. Additionally, due to limited sensitivity over certain temperature ranges continuous temperature imaging from 300 to 1400 K was not possible. Here, cerium and praseodymium doped into CSSO are investigated to address these limitations. Singly-doped Ce:CSSO and Pr:CSSO, and co-doped Ce,Pr:CSSO phosphor samples were studied. Emission lifetimes and quenching behavior were characterized in a tube furnace for each phosphor. Results from the singly-doped phosphors were used to interpret the co-doped phosphor results. The phosphor characterization data was used to estimate thermometry performance at temperatures relevant to low-temperature ignition studies in engines. The proposed diagnostic uses a combination of co-doped APT, host-referenced APT, and scattering-referenced APT approaches to increase the range over which high-precision temperature measurements can be made. Characterization results include the first reported measurements of luminescence lifetimes for Ce:CSSO and Pr:CSSO at temperatures up to 1400 K, and the highest reported quenching temperature for a phosphor using 4f5d emission (1230 K for Ce:CSSO). Furnace measurements showed a normalized temperature-sensitivity of > 0.25 % K−1 from room temperature to 1400 K for at least one diagnostic approach using the co-doped Ce,Pr:CSSO phosphor. Estimates suggest that the co-doped Ce,Pr:CSSO phosphor is feasible for APT at temperatures ranging from 300 to 925 K and 1030 to at least 1400 K, with better than 40-K single-shot precision. The performance of Ce:CSSO and Ce,Pr:CSSO are similar throughout the investigated temperature range.

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Section: Experimental Methods and Materialsmentioning

confidence: 58%

Section: Relative Signalmentioning

confidence: 73%

Section: Experimental Methods and Materialsmentioning

confidence: 99%

Section: Relative Signalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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