Temperature dependent fluorescent emission lines ofseveral rare-earth-doped ceramic phosphors have made theseand similar materials the focus of major efforts in the field ofnon-contact thermometry over the past few decades. In theapplication of phosphor thermography one of the technicalissues encountered is that of bonding (i.e., secure adhesion of)the phosphor particles to the surface undergoing thermography.A simple novel bonding technique is proposed here, whichsignificantly increases the utility of the method and saves aconsiderable amount of time for short-term measurements innon-erosive environments. The process discussed is based onthe use of chalk, in which phosphor is mixed with in equalparts with plaster of paris and a small amount of water and thensolidified. This phosphor chalk is easily applied to surfacesand has been shown to yield acceptable results formeasurements with the 514-nm line of La2O2S: Eu. A steelblock was also coated with Mg4FgeO6: Mn chalk and heated to900 C and then successfully used to measure lowertemperatures showing the phosphor to still be attached to theblock.
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