A sapphire fiber thermometer for high temperature measurement in tundish based on the fast Fourier transform

Gui-mei Wang; Dong-sheng Wang; Wei-wei Pan

doi:10.1117/12.819584

31 December 2008 A sapphire fiber thermometer for high temperature measurement in tundish based on the fast Fourier transform

Gui-mei Wang, Dong-sheng Wang, Wei-wei Pan

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Proceedings Volume 7130, Fourth International Symposium on Precision Mechanical Measurements; 71301A (2008) https://doi.org/10.1117/12.819584
Event: Fourth International Symposium on Precision Mechanical Measurements, 2008, Anhui, China

Abstract

A sapphire fiber thermometer for high temperature measurement is described. The mechanism of the fluorescence temperature measurement is based on the basic physical phenomenon of photoluminescence. The so-called photoluminescence essentially is the superthermal radiation luminescence when some materials are stimulated by ultraviolet, visible or a certain form of the infrared electromagnetic radiation. The fluorescence lifespan and fluorescence strength of all fluorescence materials will imply some temperature correlation within some homologous temperatures. It uses a specially grown sapphire fiber as thermometer probe. The end part of the sapphire fiber is doped with Cr3+ion by means of the laser heat pedestal growth (LHPG) method and coated with some high radiant material to constitute a mini fiber cavity. The fluorescence thermal probe offers the advantages of a compact structure, a high performance and the ability to withstand high temperatures in detection. According to the surface temperature, we can obtain the inner temperature by the temperature field. It can be used to measure the steel fluid of the tundish in continuous cast steel machines. An experimental system of the thermometer and the preliminary experimental results are presented.

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Gui-mei Wang, Dong-sheng Wang, and Wei-wei Pan "A sapphire fiber thermometer for high temperature measurement in tundish based on the fast Fourier transform", Proc. SPIE 7130, Fourth International Symposium on Precision Mechanical Measurements, 71301A (31 December 2008); https://doi.org/10.1117/12.819584

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KEYWORDS

Temperature metrology

Luminescence

Sapphire

Sensors

Fiber optics

Fiber optics sensors

Temperature sensors

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