Temperature field measurements in liquids using ZnO thermographic phosphor tracer particles

Abram, Christopher; Pougin, Miriam; Beyrau, Frank

doi:10.1007/s00348-016-2200-2

Cited by 28 publications

(24 citation statements)

References 40 publications

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“…Finally, the measurement uncertainty is not only related to signal statistics but can also be raised by cross-dependencies of the measured quantity on other parameters, or by interferences from other light sources. As for the other phosphors investigated, no evidence were found of an effect of the number density of particles on the optical path on the measured temperature [21,22,24,30].…”

Section: Discussionmentioning

confidence: 62%

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Investigation of the tin-doped phosphor (Sr,Mg)₃(PO₄)₂:Sn²⁺ for fluid temperature measurements

Fond

Abram

Pougin

et al. 2019

Opt. Mater. Express

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The photoluminescence properties of the phosphor (Sr,Mg) 3 (PO 4) 2 :Sn 2+ were investigated for luminescence thermometry in fluids. The luminescence emission intensity at 300 K is on the order of 10 6 photons per particle and the lifetime is 26 µs. With increasing temperature, the wide emission band exhibits a pronounced blue shift which can be exploited for temperature imaging using a two-colour ratiometric approach. The measured temperature sensitivity in an imaging configuration is 0.6%/K at 300 K. The T 50 quenching temperature is 650 K, similar to the phosphor BaMgAl 10 O 17 :Eu 2+ , but the estimated temperature sensitivity at 700 K is a factor 7 higher (0.36%/K). Moreover, the excitation laser fluence has a negligible effect on the measured temperature (0.6 K for a 10% change in the fluence), a five-to-tenfold improvement over phosphors previously investigated for fluid thermometry. The phosphor (Sr,Mg) 3 (PO 4) 2 :Sn 2+ therefore offers significant improvements for thermometry applications in turbulent flows in the 300-900 K range.

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Section: Discussionmentioning

confidence: 62%

“…Therefore phosphor-liquid dispersions were prepared according to the method outlined in Ref. [21]. A set mass of particles were dispersed in deionised water using an ultrasonic homogeniser and dilution was used to obtain mass loads in the range of 1 to 20 mg/L.…”

Section: Liquid Dispersion and Particle Countingmentioning

confidence: 99%

Investigation of the tin-doped phosphor (Sr,Mg)₃(PO₄)₂:Sn²⁺ for fluid temperature measurements

Fond

Abram

Pougin

et al. 2019

Opt. Mater. Express

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“…It also suggests that a calibration in the powder may be suitable to calibrate gasphase measurements. This is in contrast with ratio-based measurements, which often require in-situ calibration, as discussed in an upcoming review article [18]. In this regard, measurements at 1 MHz using the stack of powder were performed with increasing the PMT gain (set by the supply voltage) from 182 V to 570 V. It was noted that the phase shift decreases with increasing gain from 1.45 to 1.32 rad, so it is necessary to operate on the same supply voltage during experiments.…”

Section: Evaluation Of Potential Interference From In-phase Signalsmentioning

confidence: 99%

Thermographic laser Doppler velocimetry using the phase-shifted luminescence of BAM:Eu^2+ phosphor particles for thermometry

Ojo¹,

Fond²,

Abram³

et al. 2017

Opt. Express

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Simultaneous point measurements of gas velocity and temperature were recently demonstrated using thermographic phosphors as tracer particles. There, continuous wave (CW) excitation was used and the spectral shift of the luminescence was detected with a two-colour intensity ratio method to determine the gas temperature. The conventional laser Doppler velocimetry (LDV) technique was employed for velocimetry. In this paper, an alternative approach to the gas temperature measurements is presented, which is instead based on the temperature-dependence of the luminescence lifetime. The phase-shift between the luminescence signal and time-modulated excitation light is evaluated for single BaMgAl10O17:Eu 2+ phosphor particles as they cross the probe volume. Luminescence lifetimes evaluated in the time domain and frequency domain indicate that in these experiments interferences from in-phase signals such as stray excitation laser light are negligible. The dependence of the phase-shift on flow temperature is characterised. In the temperature sensitive range above 700 K, precise gas temperature measurements can be obtained (8.6 K at 840 K) with this approach.

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“…The temperature difference is ~50 °C, and a high measurement precision (<1%) can be maintained over this range. A video of the plume development will be available online as supplementary material [18].…”

Section: Temperature Imaging Demonstrationmentioning

confidence: 99%

Temperature Imaging in Liquids using ZnO Thermographic Phosphor Particles

Abram

Pougin

Fond

et al. 2016

Imaging and Applied Optics 2016

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Temperature field measurements in liquids are demonstrated using zinc oxide (ZnO) thermographic phosphor particles. The particles are added to the liquid as a tracer. Following laser excitation, the temperature-dependent luminescence emission of the particles is imaged and the temperature is determined using a two-colour intensity ratio method. In this work, the particle size requirements for accurate temperature tracing in turbulent liquid flows are calculated using a numerical heat transfer model. Spherical 5 µm-diameter particles are shown to have a 95% response time <35 µs in water between 0-100 °C, suitable for accurate tracing in turbulent flows. A method for preparing particle-liquid mixtures using ultrasonic dispersion was developed. The dispersions were characterised using scanning electron microscope imaging and laser diffraction particle sizing, indicating that the particle size is 1-2 µm. The particle luminescence properties were investigated using spectroscopic and particle luminescence imaging techniques. Using 355 nm laser excitation, the luminescence signal is shown to be the same in water and in air. However, 266 nm excitation is used to avoid spectral overlap between Raman scattering from water and the detected ZnO luminescence emission. It is shown that 266 nm excitation can be used for temperature measurements in water using mass loads as low as 1-5 mg/L, corresponding to measured particle number densities 0.5-2.5x10 12 particles/m 3. In this range, the measured intensity ratio is independent of the mass load. The dependence of the intensity ratio on the laser fluence is also less pronounced using excitation at 266 nm compared to 355 nm. A singleshot, single-pixel temperature precision of 2-3 °C can be achieved over a temperature range spanning 50 °C. The technique was applied to a convection experiment to measure the temperature fields in a buoyant thermal plume, demonstrating the suitability of these imaging diagnostics for the investigation of thermal convection and heat transfer.

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Temperature field measurements in liquids using ZnO thermographic phosphor tracer particles

Cited by 28 publications

References 40 publications

Investigation of the tin-doped phosphor (Sr,Mg)₃(PO₄)₂:Sn²⁺ for fluid temperature measurements

Investigation of the tin-doped phosphor (Sr,Mg)₃(PO₄)₂:Sn²⁺ for fluid temperature measurements

Thermographic laser Doppler velocimetry using the phase-shifted luminescence of BAM:Eu^2+ phosphor particles for thermometry

Temperature Imaging in Liquids using ZnO Thermographic Phosphor Particles

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Temperature field measurements in liquids using ZnO thermographic phosphor tracer particles

Cited by 28 publications

References 40 publications

Investigation of the tin-doped phosphor (Sr,Mg)3(PO4)2:Sn2+ for fluid temperature measurements

Investigation of the tin-doped phosphor (Sr,Mg)3(PO4)2:Sn2+ for fluid temperature measurements

Thermographic laser Doppler velocimetry using the phase-shifted luminescence of BAM:Eu^2+ phosphor particles for thermometry

Temperature Imaging in Liquids using ZnO Thermographic Phosphor Particles

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Investigation of the tin-doped phosphor (Sr,Mg)₃(PO₄)₂:Sn²⁺ for fluid temperature measurements

Investigation of the tin-doped phosphor (Sr,Mg)₃(PO₄)₂:Sn²⁺ for fluid temperature measurements