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Multiple scattering reduction in instantaneous gas phase phosphor thermometry: applications with dispersed seeding

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
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Multiple scattering reduction in instantaneous gas phase phosphor thermometry: applications with dispersed seeding
Language: English
Date: 9 January 2024
Place of Publication: Darmstadt
Year of primary publication: 2019
Place of primary publication: Bristol
Publisher: IOP Publishing
Journal or Publication Title: Measurement Science and Technology
Volume of the journal: 30
Issue Number: 5
Collation: 11 Seiten
DOI: 10.26083/tuprints-00020465
Corresponding Links:
Origin: Secondary publication DeepGreen

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.

Uncontrolled Keywords: fluid thermometry, laser-induced phosphorescence, thermographic phosphor particles, multiple scattering, structured illumination
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-204657
Additional Information:

The Inaugural International Conference on Phosphor Thermometry (ICPT 2018)

Classification DDC: 500 Science and mathematics > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 07 Department of Chemistry > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie
16 Department of Mechanical Engineering > Institute of Reactive Flows and Diagnostics (RSM)
Date Deposited: 09 Jan 2024 10:37
Last Modified: 05 Mar 2024 10:56
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20465
PPN: 515972614
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