Improved measurement precision in decay time-based phosphor thermometry

Nada, Fahd Jouda Abou; Knappe, Christoph; Aldén, Marcus; Richter, Mattias

doi:10.1007/s00340-016-6446-4

Cited by 9 publications

(7 citation statements)

References 19 publications

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“…In addition, systematic errors can contribute to the uncertainty. The influence of the laser energy has been investigated for some phosphors before (for example SV67 [27], YAG:Dy and YAG:Eu [28] and CdWO 4 [29]). Considering pulse-to-pulse laser energy fluctuations of less than 10%, the contribution is well below 0.1 % and therefore of minor importance.…”

Section: Calibration and Uncertainty Analysismentioning

confidence: 99%

“…Considering pulse-to-pulse laser energy fluctuations of less than 10%, the contribution is well below 0.1 % and therefore of minor importance. Differences in the detection system (for example PMT and oscilloscope settings) can cause systematic errors of several Kelvin [29]. Furthermore the data evaluation procedure influences the obtained decay rate.…”

Section: Calibration and Uncertainty Analysismentioning

confidence: 99%

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Wall Temperature Measurements in Gas Turbine Combustors With Thermographic Phosphors

Nau

Yin

Lammel

et al. 2018

Journal of Engineering for Gas Turbines and Power

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Phosphor thermometry has been developed for wall temperature measurements in gas turbines and gas turbine model combustors. An array of phosphors has been examined in detail for spatially and temporally resolved surface temperature measurements. Two examples are provided, one at high pressure (8 bar) and high temperature and one at atmospheric pressure with high time resolution. To study the feasibility of this technique for full-scale gas turbine applications, a high momentum confined jet combustor at 8 bar was used. Successful measurements up to 1700 K on a ceramic surface are shown with good accuracy. In the same combustor, temperatures on the combustor quartz walls were measured, which can be used as boundary conditions for numerical simulations. An atmospheric swirl-stabilized flame was used to study transient temperature changes on the bluff body. For this purpose, a high-speed setup (1 kHz) was used to measure the wall temperatures at an operating condition where the flame switches between being attached (M-flame) and being lifted (V-flame) (bistable). The influence of a precessing vortex core (PVC) present during M-flame periods is identified on the bluff body tip, but not at positions further inside the nozzle.

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Section: Calibration and Uncertainty Analysismentioning

confidence: 99%

Section: Calibration and Uncertainty Analysismentioning

confidence: 99%

Wall Temperature Measurements in Gas Turbine Combustors With Thermographic Phosphors

Nau

Yin

Lammel

et al. 2018

Journal of Engineering for Gas Turbines and Power

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“…The BGO scintillator used in this study was characterized in an optical He flow cryostat using a calibrated Cernox temperature sensor from Lakeshore. Since the accuracy of the calibration may be affected by factors other than temperature (Abou Nada et al, 2016), it is important to ensure that the calibration is carried out under the same conditions as during real measurements. This requirement is rather difficult to satisfy as the setup used for the calibration measurements differs from the thermometry system described in the previous section.…”

Section: Sensor Calibrationmentioning

confidence: 99%

Non-contact luminescence lifetime cryothermometry for macromolecular crystallography

2017

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Temperature is a very important parameter when aiming to minimize radiation damage to biological samples during experiments that utilize intense ionizing radiation. A novel technique for remote, non-contact, in situ monitoring of the protein crystal temperature has been developed for the new I23 beamline at the Diamond Light Source, a facility dedicated to macromolecular crystallography (MX) with long-wavelength X-rays. The temperature is derived from the temperature-dependent decay time constant of luminescence from a minuscule scintillation sensor (<0.05 mm 3 ) located in very close proximity to the sample under test. In this work the underlying principle of cryogenic luminescence lifetime thermometry is presented, the features of the detection method and the choice of temperature sensor are discussed, and it is demonstrated how the temperature monitoring system was integrated within the viewing system of the endstation used for the visualization of protein crystals. The thermometry system was characterized using a Bi 4 Ge 3 O 12 crystal scintillator that exhibits good responsivity of the decay time constant as a function of temperature over a wide range (8-270 K). The scintillation sensor was calibrated and the uncertainty of the temperature measurements over the primary operation temperature range of the beamline (30-150 K) was assessed to be AE 1.6 K. It has been shown that the temperature of the sample holder, measured using the luminescence sensor, agrees well with the expected value. The technique was applied to characterize the thermal performance of different sample mounts that have been used in MX experiments at the I23 beamline. The thickness of the mount is shown to have the greatest impact upon the temperature distribution across the sample mount. Altogether, these tests and findings demonstrate the usefulness of the thermometry system in highlighting the challenges that remain to be addressed for the in-vacuum MX experiment to become a reliable and indispensable tool for structural biology.

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“…However, these earlier studies only investigated detection system effects at a fixed or slightly varying decay times. Furthermore, these studies did not always sufficiently decouple the effects due to changing phosphorescence intensity, PMT gain and laser fluence [6,[8][9][10][11]. The importance of decoupling these factors becomes evident when studying the relation between laser fluence and measured decay time.…”

Section: Introductionmentioning

confidence: 98%

Sources of error for single-shot PMT-based phosphor thermometry in harsh conditions

Feuk

Sanned

Richter

et al. 2021

Meas. Sci. Technol.

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This study investigates photomultiplier tube (PMT) nonlinearities, relevant for lifetime phosphor thermometry, at various decay times to assess and minimize the impact on temperature measurement accuracy. The focus is single-shot measurements performed in harsh environments where phosphor signal attenuation often is a concern. The sensitivity of decay time measurements to changing phosphorescence intensity is therefore investigated. The experimental results show that for the studied phosphors and detectors, shorter decay times between 20 ns and 6 µs, saturation effects in the PMTs decreased the measured decay time with increasing signal attenuation. For longer phosphorescence decay times, in the millisecond regime, nonlinearity effects led to an increase in the measured decay time with increasing signal attenuation. The specific detector nonlinearity response will vary among detectors, but the introduced methodology for detector analysis is a useful resource for assessing and improving accuracy in lifetime phosphor thermometry measurements.

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Improved measurement precision in decay time-based phosphor thermometry

Cited by 9 publications

References 19 publications

Wall Temperature Measurements in Gas Turbine Combustors With Thermographic Phosphors

Wall Temperature Measurements in Gas Turbine Combustors With Thermographic Phosphors

Non-contact luminescence lifetime cryothermometry for macromolecular crystallography

Sources of error for single-shot PMT-based phosphor thermometry in harsh conditions

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