What is it about?
Phosphor thermometry is an optical method for surface temperature measurement which exploits the luminescence of a phosphor coating, applied to a surface, which changes with temperature. It has the potential to overcome the limitations of traditional thermometry techniques and can be independent of the surface emissivity and unperturbed by strong background thermal radiation. Thermographic phosphors exhibit a change in their temporal or spectral luminescence properties during or following excitation with UV or near-UV light. With suitable calibration against the International Temperature scale of 1990 (ITS-90), these properties can be related traceably to temperature.
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Why is it important?
Accurate, traceable temperature measurements are critical in many industrial processes particularly at elevated temperatures. For example, successful thermal processing of metals during forging and forming processes is critically dependent on process temperature. Traditionally, surface temperatures are determined by infrared thermometry (spot pyrometers or thermal images) or sprung-loaded thermocouples. However, it is known that these approaches can have large uncertainties, due to unknown emissivity and background radiation in the former case and due to variable contact and heat-sink effects in the latter. Phosphor thermometry addresses these challenges.
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This page is a summary of: Imaging luminescence thermometry: Recent developments at NPL, January 2024, American Institute of Physics,
DOI: 10.1063/5.0234178.
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