A thin film coating for phosphor thermography

Abstract

Phosphor thermography is a laser-induced fluorescence method utilized for the temperature sensing of rotating components within inhospitable environments. Results presented here show that thin film coatings for thermographic sensors have a much higher durability than conventional thick film coatings. Room-temperature measurements demonstrate that the intensity of the luminescent emission from thin films is equivalent to that from thick films. Lifetime measurements carried out at C show that thin films survived for up to ten hours, whereas thick film samples survived for less than one. More importantly, post-run measurements of thin films indicate little degradation in the intensity of the fluorescent signal. This illustrates the capability of thin film sensors for remote temperature sensing.

Planar measurements of spray-induced wall cooling using phosphor thermometry

“…Other works on other phosphors have also shown an influence of annealing or deposition temperature on the luminescence properties. For example, in Ranson et al 1998, where the effects of annealing temperature and duration are investigated, the researchers showed that similar levels of luminescence between radio frequency (RF) magnetron sputtered Y 2 O 3 :Eu thin films and thick sprayed films can be obtained by altering the annealing parameters. In Choy et al 2011, emission-line sharpening and shift effects were observed to various extents at different deposition temperatures for electronassisted chemical vapour deposition (EACVD) Y 2 O 3 :Eu films.…”

Temperature dependent characteristics of La2O2S: Ln [Ln=Eu, Tb] with various Ln concentrations over 5–60°C

“…This is attributed to their accurate sensing capability over a wide range of temperatures, as well as their ability to withstand a harsh environment. For example, europium doped yttrium oxide (Y 2 O 3 : Eu) has been utilised for high temperature sensing within a rotating gas turbine [1,2] and magnesium fluorogermanate doped with manganese (Mg 4 (F)GeO 6 : Mn) has been explored for thermal mapping of hot spots on the walls of a cryogenic fuel tank [3] . Problems associated with temperature monitoring within a magnetic resonance imaging (MRI)…”

Progress towards absolute intensity measurements of emissions from high temperature thermographic phosphors

“…This was in agreement with tests conducted in Refs. [20][21][22]. There were no observable irreversible effects using powdered samples, and it is envisaged that the results from this investigation would be similar to those produced by vapour deposition or plasma splaying methodologies.…”