Sapphire-fiber-based pyrometer for harsh environment applications

Juntao Wu; Kung-Li Deng; Zhe Wang; Boon Lee; Renato Guida

doi:10.1117/12.681040

24 August 2006 Sapphire-fiber-based pyrometer for harsh environment applications

Juntao Wu, Kung-Li Deng, Zhe Wang, Boon Lee, Renato Guida

Proceedings Volume 6314, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications XII; 63140Z (2006) https://doi.org/10.1117/12.681040
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

It is very critical to develop sensor that can operate in high temperature and chemically harsh environments. Sapphire (Al₂O₃) material, which possesses a melting point of 2050°C and a wide transmission wavelength region as high as ~3.5μm, has been demonstrated to be an ideal candidate for high temperature fiber-based environmental sensing applications. Under harsh environment, the performance of conventional blackbody radiation based sapphire fiber high temperature sensor could be easily affected due to the lack of cladding. In this paper, a fiber-optic temperature sensor with a single-crystal sapphire fiber as the light guide and a high temperature ceramic coating as the sensing element as well as the protection layer was presented. The radiance emitted from the ceramic coating is used to measure the temperature, and it is transmitted to optical receiver through the sapphire fiber. This ceramic coating greatly improved the stability and dynamical range of pyrometer. Preliminary experimental results demonstrated that the sensor is very promising for measuring ultra-high temperature up to 1900°C in the harsh environment.

Citation Download Citation

Juntao Wu, Kung-Li Deng, Zhe Wang, Boon Lee, and Renato Guida "Sapphire-fiber-based pyrometer for harsh environment applications", Proc. SPIE 6314, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications XII, 63140Z (24 August 2006); https://doi.org/10.1117/12.681040

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