For the transpiration determination of vaporization properties whose interconsistency is critical, the simultaneous vaporization of a reference substance such as uncontaminated gold is suggested as an alternative to accurate pyrometry. Calculations suggest that gold would be superior to all but the most accurate pyrometry in the temperature range 1700 to 2300 K. An application to seeking unreported gaseous hydrates of beryllia is illustrated by calculations based on estimated thermodynamic parameters.
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http://dx.doi.org/10.6028/jres.076A.046 | DOI Listing |
Microsc Microanal
November 2024
Department of Materials Science & Engineering, University of California Irvine, Irvine, CA 92697, USA.
Recent work in ultra-high temperature in situ electron microscopy has presented the need for accurate, contact-free temperature determination at the microscale. Optical measurement based on thermal radiation (pyrometry) is an attractive solution but can be difficult to perform correctly due to effects, such as emissivity and optical transmission, that must be accounted for. Here, we present a practical guide to calibrating and using a spectral pyrometry system, including example code, using a Czerny-Turner spectrometer attached to a transmission electron microscope.
View Article and Find Full Text PDFSensors (Basel)
January 2023
NORCE Norwegian Research Centre AS, 4630 Kristiansand, Norway.
Real-time closed-loop control of metallurgical processes is still in its infancy, mostly based on simple models and limited sensor data and challenged by extreme temperature and harsh process conditions. Contact-free thermal imaging-based measurement approaches thus appear to be particularly suitable for process monitoring. With the potential to generate vast amounts of accurate data in real time and combined with artificial intelligence methods to enable real-time analysis and integration of expert knowledge, thermal spectral imaging is identified as a promising method offering more robust and accurate identification of key parameters, such as surface temperature, morphology, composition, and flow rate.
View Article and Find Full Text PDFSensors (Basel)
December 2022
Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA.
Accurate and high-speed transient surface-temperature measurements of combustion devices including internal combustion (IC) engines, gas turbines, etc., provide validation targets and boundary conditions for computational fluid dynamics models, and are broadly relevant to technology advancements such as performance improvement and emissions reduction. Development and demonstration of a multi-infrared-channel pyrometry-based optical instrument for high-speed surface-temperature measurement is described.
View Article and Find Full Text PDFRev Sci Instrum
September 2022
CEA, DES, IRESNE, DEC, Cadarache, F-13108 Saint-Paul-Lez-Durance, France.
Experimental research into severe nuclear accidents often requires the accurate measurement of high temperatures of molten materials. Measurements of very high temperatures (1500-2500 °C) in liquid materials using standard pyrometry can entail uncertainties in the order of 5%-10%. Pyroreflectometry is a powerful technique with the potential to significantly reduce these uncertainties.
View Article and Find Full Text PDFRev Sci Instrum
April 2021
Department of Mechanical Engineering, IIT Bombay, Powai, Mumbai, Maharashtra 400076, India.
The accurate measurement of temperature in sooty flames remains a challenging task. In this study, the procedure for calibration and use of a consumer-grade digital single-lens reflex (DSLR) camera for the measurement of temperature in sooty flames using color-ratio pyrometry (CRP) is elucidated. Owing to the necessity of acquiring RAW images for CRP, investigations conducted thus far have been limited to stable flames.
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