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Title: Embedded Optical Sensors for Thermal Barrier Coatings

Abstract

In the second year of this program on developing embedded optical sensors for thermal barrier coatings, our research has focused three topics: (1) Eu{sup 3+} doping for temperature sensing, (2) the effect of long-term, high-temperature aging on the characteristics of the luminescence from the Eu{sup 3+} ions of 8YSZ materials, (3) construction of a fiber-optic based luminescence detector system. It has been demonstrated that the variation in luminescence lifetime with temperature is identical for electron-beam evaporated Eu-doped YSZ coatings as for bulk ceramics of the same composition. Experiments indicate that the luminescence lifetime method of measuring temperatures is sensitive up to 1150 C for both Eu-doped YSZ coatings and Eu-doped Gd{sub 2}Zr{sub 2}O{sub 7}. Furthermore, the technique is sensitive up to 1250 C for the composition Eu{sub 2}Zr{sub 2}O{sub 7}. The luminescence spectra Eu-doped YSZ are insensitive to long-term aging at high-temperatures, even to 195 hours at 1425 C, except for a small frequency shift that is probably too small in measure except with instruments of the highest spectral resolution. The temperature of 1425 C is much higher than present engines attain or even planned in the foreseeable future. Nevertheless, experiments are on-going to explore longer term exposures. A fiber-opticmore » based luminescence system has been constructed in which the hottest section of fiber operates to at least 1250 C.« less

Authors:
Publication Date:
Research Org.:
University of California
Sponsoring Org.:
USDOE
OSTI Identifier:
875889
DOE Contract Number:
FG26-03NT41794
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 47 OTHER INSTRUMENTATION; AGING; CERAMICS; PROTECTIVE COATINGS; ENGINES; LUMINESCENCE; RESOLUTION; PROBES; DESIGN; TEMPERATURE MONITORING; EUROPIUM OXIDES; YTTRIUM OXIDES; STRONTIUM OXIDES; ZIRCONIUM OXIDES; GADOLINIUM OXIDES

Citation Formats

David R. Clarke. Embedded Optical Sensors for Thermal Barrier Coatings. United States: N. p., 2005. Web. doi:10.2172/875889.
David R. Clarke. Embedded Optical Sensors for Thermal Barrier Coatings. United States. doi:10.2172/875889.
David R. Clarke. Wed . "Embedded Optical Sensors for Thermal Barrier Coatings". United States. doi:10.2172/875889. https://www.osti.gov/servlets/purl/875889.
@article{osti_875889,
title = {Embedded Optical Sensors for Thermal Barrier Coatings},
author = {David R. Clarke},
abstractNote = {In the second year of this program on developing embedded optical sensors for thermal barrier coatings, our research has focused three topics: (1) Eu{sup 3+} doping for temperature sensing, (2) the effect of long-term, high-temperature aging on the characteristics of the luminescence from the Eu{sup 3+} ions of 8YSZ materials, (3) construction of a fiber-optic based luminescence detector system. It has been demonstrated that the variation in luminescence lifetime with temperature is identical for electron-beam evaporated Eu-doped YSZ coatings as for bulk ceramics of the same composition. Experiments indicate that the luminescence lifetime method of measuring temperatures is sensitive up to 1150 C for both Eu-doped YSZ coatings and Eu-doped Gd{sub 2}Zr{sub 2}O{sub 7}. Furthermore, the technique is sensitive up to 1250 C for the composition Eu{sub 2}Zr{sub 2}O{sub 7}. The luminescence spectra Eu-doped YSZ are insensitive to long-term aging at high-temperatures, even to 195 hours at 1425 C, except for a small frequency shift that is probably too small in measure except with instruments of the highest spectral resolution. The temperature of 1425 C is much higher than present engines attain or even planned in the foreseeable future. Nevertheless, experiments are on-going to explore longer term exposures. A fiber-optic based luminescence system has been constructed in which the hottest section of fiber operates to at least 1250 C.},
doi = {10.2172/875889},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Nov 09 00:00:00 EST 2005},
month = {Wed Nov 09 00:00:00 EST 2005}
}

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