Stephan, Michael ; Zentgraf, Florian ; Berrocal, Edouard ; Albert, Barbara ; Böhm, Benjamin ; Dreizler, Andreas (2024)
Multiple scattering reduction in instantaneous gas phase phosphor thermometry: applications with dispersed seeding.
In: Measurement Science and Technology, 2019, 30 (5)
doi: 10.26083/tuprints-00020465
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
In this study the structured laser illumination planar imaging (SLIPI) technique is combined with gas phase phosphor thermometry to measure quasi-instantaneously two-dimensional temperature fields with reduced bias from multiple scattering. Different reconstruction strategies are implemented, evaluated and compared, including a two-pulse and one-pulse SLIPI approach. A gradient-based threshold algorithm for particle detection is applied to conventional planar light sheet imaging as an alternative to reduce the bias caused by multiple scattering in seeding-free regions. As a demonstration, measurements are performed in a canonical flow configuration, consisting of a heated, turbulent, air jet surrounded by an ambient co-flow. Both air flows are seeded with the thermographic phosphor BaMgAl₁₇O₁₇:Eu²⁺.
Conventional light sheet imaging in the context of gas phase phosphor thermometry suffers from multiple scattering causing a significant temperature bias and low temperature sensitivity. Applying the gradient threshold algorithm removes areas without any seeding particles which improves accuracy, precision and temperature sensitivity. However, multiple scattering influences are still present and may cause an increasing bias particularly for higher seeding density. One pulse (1p) SLIPI exhibits high accuracy at intermediate precision. Multiply scattered luminescence is not fully removed and spatial resolution is lowered. Two pulse (2p) SLIPI is recommended for high temperature sensitivity and accuracy, removing impact of multiple scattering furthermost. However, 2p-SLIPI exhibits reduced temperature precision.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Stephan, Michael ; Zentgraf, Florian ; Berrocal, Edouard ; Albert, Barbara ; Böhm, Benjamin ; Dreizler, Andreas |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Multiple scattering reduction in instantaneous gas phase phosphor thermometry: applications with dispersed seeding |
| Sprache: | Englisch |
| Publikationsjahr: | 9 Januar 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 2019 |
| Ort der Erstveröffentlichung: | Bristol |
| Verlag: | IOP Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Measurement Science and Technology |
| Jahrgang/Volume einer Zeitschrift: | 30 |
| (Heft-)Nummer: | 5 |
| Kollation: | 11 Seiten |
| DOI: | 10.26083/tuprints-00020465 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/20465 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | In this study the structured laser illumination planar imaging (SLIPI) technique is combined with gas phase phosphor thermometry to measure quasi-instantaneously two-dimensional temperature fields with reduced bias from multiple scattering. Different reconstruction strategies are implemented, evaluated and compared, including a two-pulse and one-pulse SLIPI approach. A gradient-based threshold algorithm for particle detection is applied to conventional planar light sheet imaging as an alternative to reduce the bias caused by multiple scattering in seeding-free regions. As a demonstration, measurements are performed in a canonical flow configuration, consisting of a heated, turbulent, air jet surrounded by an ambient co-flow. Both air flows are seeded with the thermographic phosphor BaMgAl₁₇O₁₇:Eu²⁺. Conventional light sheet imaging in the context of gas phase phosphor thermometry suffers from multiple scattering causing a significant temperature bias and low temperature sensitivity. Applying the gradient threshold algorithm removes areas without any seeding particles which improves accuracy, precision and temperature sensitivity. However, multiple scattering influences are still present and may cause an increasing bias particularly for higher seeding density. One pulse (1p) SLIPI exhibits high accuracy at intermediate precision. Multiply scattered luminescence is not fully removed and spatial resolution is lowered. Two pulse (2p) SLIPI is recommended for high temperature sensitivity and accuracy, removing impact of multiple scattering furthermost. However, 2p-SLIPI exhibits reduced temperature precision. |
| Freie Schlagworte: | fluid thermometry, laser-induced phosphorescence, thermographic phosphor particles, multiple scattering, structured illumination |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-204657 |
| Zusätzliche Informationen: | The Inaugural International Conference on Phosphor Thermometry (ICPT 2018) |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 540 Chemie 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie 16 Fachbereich Maschinenbau > Fachgebiet Reaktive Strömungen und Messtechnik (RSM) |
| Hinterlegungsdatum: | 09 Jan 2024 10:37 |
| Letzte Änderung: | 10 Jan 2024 08:15 |
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- Multiple scattering reduction in instantaneous gas phase phosphor thermometry: applications with dispersed seeding. (deposited 09 Jan 2024 10:37) [Gegenwärtig angezeigt]
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