Sub-second laser heating of thermal impulse sensors

Gunawidjaja, Ray; Anderson, Benjamin R.; Price, Patrick; Diez-y-Riega, Helena; Eilers, Hergen

doi:10.1063/1.4971570

Cited by 10 publications

(10 citation statements)

References 12 publications

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“…Recently, we adapted an ex situ thermal impulse sensing technique (first developed for explosions 4–13 ) for use in structural fire forensics. 14 In this study we test this technique’s TI sensing capability using a “controlled” fire in a burn chamber at ATF’s Fire Research Laboratory.…”

Section: Resultsmentioning

confidence: 99%

“…Given the challenges with current techniques to obtain accurate spatially resolved TI profiles—in both lab-based and structural fires—it is therefore desirable to develop a new TI determination technique that can be used for both purposes. To that end we have recently adapted an ex situ TI technique (first developed for use in explosive fireballs 4–13 ) for use in structural fires. 14 This technique utilizes irreversible phase changes in lanthanide-doped oxide nanoparticles to determine a heating event’s TI.…”

Section: Introductionmentioning

confidence: 99%

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Burn Chamber Test of Ex Situ Thermal Impulse Sensors

et al. 2020

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Recently, we reported on a novel ex situ thermal impulse sensing technique (based on lanthanide-doped oxide precursor nanoparticles) for use in structural fire forensics and demonstrated its functionality in small-scale lab-based tests. As a next step we have now performed a large-scale lab test at the US Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) Fire Research Laboratory using a burn chamber with three sand burners. In this test we demonstrate our technique’s ability to determine the average temperature experienced by surfaces during the fire. While we successfully demonstrate our techniques accuracy, we also discover several previously unknown vulnerabilities. Namely, we find that: (1) our current method of embedding sensors in paint results in our sensor particles being difficult to recover (due to a large quantity of debris), (2) the current test panels have poor survivability, (3) debris from the fire tests interferes with excitation of dopant Dy ions (limiting our sensors’ functionality), and (4) dispersal in paint results in suppression of the (metastable)tetragonal-to-monoclinic phase transition of ZrO2. To overcome these vulnerabilities we are evaluating new panel materials, paints, and lanthanide-dopants.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Burn Chamber Test of Ex Situ Thermal Impulse Sensors

et al. 2020

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“…3+ is a well known lanthanide ion used for a wide variety of optical applications [22][23][24][25][26][27][28][29][30][34][35][36][37][38][39][40][41][42], with a common application being two-color thermometry (TCT) [22][23][24][25][26][27][28][29][30]34]. TCT using Dy relies on two closely spaced Dy energy levels ( 4 I 15/2 and 4 F 9/2 ) to act as a probe of temperature.…”

Section: Dymentioning

confidence: 99%

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

2017

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We develop a two-color thermometry (TCT) phosphor based on [Y1−xDyx(acetylacetonate)3(1,10-phenanthroline)] ([Y1−xDyx(acac)3(phen)]) molecular crystals for use in heterogeneous materials. We characterize the optical properties of [Y1−xDyx(acac)3(phen)] crystals at different temperatures and Dy concentrations and find that the emission is strongly quenched by increasing temperature and concentration. We also observe a broad background emission (due to the ligands) and find that [Y1−xDyx(acac)3(phen)] photodegrades under 355 nm illumination with the photodegradation resulting in decreased luminescence intensity. However, while decreasing the overall emission intensity, photodegradation is not found to influence the integrated intensity ratio of the 4 I 15/2 → 6 H 15/2 and 4 F 9/2 → 6 H 15/2 transitions. This ratio allows us to compute the temperature of the complex Based on the temperature dependence of these ratios we calculate that [Y1−xDyx(acac)3(phen)] has a maximum sensitivity of 1.5 % K −1 and our TCT system has a minimum temperature resolution of 1.8 K. Finally, we demonstrate the use of [Y1−xDyx(acac)3(phen)] as a TCT phosphor by determining a dynamic temperature profile using the emission from [Y1−xDyx(acac)3(phen)].

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“…Dy 3+ is a well known lanthanide ion used for a wide variety of optical applications [22][23][24][25][26][27][28][29][30][34][35][36][37][38][39][40][41][42], with a common application being two-color thermometry (TCT) [22][23][24][25][26][27][28][29][30]34]. TCT using Dy relies on two closely spaced Dy energy levels ( 4 I 15/2 and 4 F 9/2 ) to act as a probe of temperature.…”

Section: Background a Two-color Thermometrymentioning

confidence: 99%

Two-color Thermosensors based on [Y$_{1-X}$Dy$_X$(acetylacetonate)$_3$(1,10-phenanthroline) Molecular Crystals

Anderson,

Gunawidjaja,

Eilers

2017

Preprint

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Sub-second laser heating of thermal impulse sensors

Cited by 10 publications

References 12 publications

Burn Chamber Test of Ex Situ Thermal Impulse Sensors

Burn Chamber Test of Ex Situ Thermal Impulse Sensors

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

Two-color Thermosensors based on [Y$_{1-X}$Dy$_X$(acetylacetonate)$_3$(1,10-phenanthroline) Molecular Crystals

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