Temperature measurement techniques for gas and liquid flows using thermographic phosphor tracer particles

Abram, Christopher; Fond, Benoît; Beyrau, Frank

doi:10.1016/j.pecs.2017.09.001

Cited by 178 publications

(142 citation statements)

References 208 publications

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“…1, leads to different intensity ratio values as a function of the temperature and so it cannot be used as an ex-situ calibration. Some of the difference can be attributed to the different physical state of the material between bulk powder and coating, leading to variations in the optical and thermal properties (which were discussed in Fond et al (2015) and Abram et al (2018) in the context of dispersed particles versus bulk powder) as well as interference from binder fluorescence. The knowledge of the spectral response of the various optical components is also not known with sufficient accuracy, in particular for non-collimated light and for the spectral range below 400 nm.…”

Section: Calibration Procedures and Measurement Uncertaintymentioning

confidence: 99%

Planar measurements of spray-induced wall cooling using phosphor thermometry

et al. 2018

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The wall cooling induced by spray impingement is investigated using phosphor thermometry. Thin coatings of zinc oxide (ZnO) phosphor were applied with a transparent chemical binder onto a steel surface. Instantaneous spatially resolved temperatures were determined using the spectral intensity ratio method directly after the injection of UV-grade hexane onto the surface using a commercial gasoline injector. The investigations showed that 2D temperature measurements with high spatial and shot-to-shot precision of, respectively, 0.5 and 0.6 K can be achieved, allowing the accurate resolution of the cooling induced by the spray. The presence of a liquid film over the phosphor coating during measurements showed no noticeable influence on the measured temperatures. However, in some cases a change in the intensity ratio at the spray impingement area, in the form of a permanent "stain", could be observed after multiple injections. The formation of this stain was less likely with increasing annealing time of the coating as well as lower plate operating temperatures during the injection experiments. Finally, the experimental results indicate a noticeable influence of the thickness of the phosphor coating on the measured spray-induced wall cooling history. Hence, for quantitative analysis, a compromise between coating thickness and measurement accuracy needs to be considered for similar applications where the heat transfer rates are very high.

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Section: Calibration Procedures and Measurement Uncertaintymentioning

confidence: 99%

Planar measurements of spray-induced wall cooling using phosphor thermometry

et al. 2018

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“…These emitters must exhibit a fully reproducible radiative lifetime vs. temperature dependence, and demonstrate an invariant behavior towards excitation-light intensity. While emitters satisfying these conditions do exist, the precision of thermometry utilizing them was so far reported to be only in the 0.1-1 °C range 9,15,18 . This level of precision can be again attributed to two factors: the often moderate thermal sensitivity of available thermographic luminophores 18 , and the PL lifetime measurement techniques that have been traditionally applied in industry.…”

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confidence: 99%

“…While emitters satisfying these conditions do exist, the precision of thermometry utilizing them was so far reported to be only in the 0.1-1 °C range 9,15,18 . This level of precision can be again attributed to two factors: the often moderate thermal sensitivity of available thermographic luminophores 18 , and the PL lifetime measurement techniques that have been traditionally applied in industry. As a result, progress in the development of PL-lifetime thermography suffered from the exclusive use of expensive, bulky techniques that are in fact single-point measurements, which prohibit fast image acquisition.…”

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confidence: 99%

High-resolution remote thermometry and thermography using luminescent low-dimensional tin-halide perovskites

Yakunin¹,

Benin²,

Shynkarenko³

et al. 2019

Nat. Mater.

277

258

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bolometric detectors, owing to advancements in MEMS-technologies (Micro-Electro-Mechanical Systems) 6,7 , have already entered the consumer electronics market, and are able to record thermal images with both high speed and high resolution. However, their thermographic performance, based on measurements of IR radiation intensity, is inherently limited by the transparency and emissivity/reflectivity of an observed object and, more importantly, by any material and medium (window, coating, matrix, solvent etc.) situated within the path between the detector and an object ( Fig. 1). As one of the major consequences, IR thermography cannot be easily combined with conventional optical microscopy or other enclosed optical systems such as cryostats or microfluidic cells.An alternative method for remote thermography, which is unhindered by enclosures or IRabsorptive media, utilizes temperature sensitive luminophores (i.e. fluorophores or phosphors) with PL in the visible spectral range (Fig. 1c) that are deposited onto, or incorporated into, the object of interest as temperature probes [8][9][10][11][12][13][14][15][16] . To probe an object's temperature, the luminophore is then excited by an ultraviolet or visible (UV-Vis) pulsed source (e.g. laser or light-emitting diode) and the temperature-dependent PL lifetime decay is then analyzed by time-resolving detectors.This PL-lifetime approach exhibits several benefits: the excitation power and, consequently the PL intensity, can be adjusted to a value appropriate for the dynamic range of the detector.Additionally, the use of UV-Vis light, rather than mid-to long-wavelength IR radiation, allows for the direct integration of this method with conventional optical spectroscopy and microscopy applied in biological studies and materials research. Furthermore, higher spatial resolutions can be obtained with visible light (400-700 nm) as the diffraction-limit is ca. 20-times sharper than for LWIR (7-14 µm); this potentially extends the utility of remote thermography to intracellular, in vitro, and in vivo studies 17 .

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“…The large number of review articles that are frequently published in these areas is evidence of this. Recent examples have focused on applications of optical diagnostics to gas phase environments [1][2][3][4][5], liquids [1,4,6,7], and multiphase systems [7][8][9][10]. A key feature of such light-based methods is that they are usually non-intrusive, and hence they do not notably affect the system under investigation.…”

Section: Introductionmentioning

confidence: 99%