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Noncontact Methods for Measuring Thermal Barrier Coating Temperatures
Author(s) -
Gentleman Molly M.,
Lughi Vanni,
Nychka John A.,
Clarke David R.
Publication year - 2006
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2006.02069.x
Subject(s) - materials science , thermal barrier coating , pyrometer , dopant , luminescence , raman spectroscopy , coating , cubic zirconia , optoelectronics , temperature measurement , composite material , doping , optics , ceramic , physics , quantum mechanics
Three noncontact, optical methods for measuring temperature are reviewed with an emphasis on their application to the measurement of temperatures of thermal barrier coatings (TBCs). The methods are: infrared pyrometry, Raman spectroscopy, and photo‐stimulated luminescence from lanthanide‐doped coatings. Although each has the capability of measuring temperatures pertinent to monitoring TBCs, the finite thickness of typical coatings together with the optical properties of zirconia place severe restrictions on the depth from which the temperature sensing can be obtained. Some of these limitations can be circumvented using photo‐stimulated luminescence with coatings containing dopants at specific locations. To illustrate this, it is demonstrated that by depositing coatings with a lanthanide dopant, such as Eu 3+ , at specific locations, for instance in contact with the metallic alloy, temperature sensing can be performed with much higher spatial resolution.