Uni- and multivariate calibration of tempe­rature from the neodymium fluorescence spectra in nanocrystals of yttrium-gadolinium oxide and yttrium-gadolinium garnet

The use of neodymium-doped nanocrystalline powders yttrium-gadolinium oxide and yttrium gadolinium garnet to increase the sensitivity local fluorescent optical temperature sensors is considered. Based on dependences neodymium fluorescence spectra in this powders, univariate (using intensity ratio from thermally coupled energy levels activator) multivariate partial least squares method) calibration models are developed. When using spectral range 860 – 950 nm falling into first biological transparency window (700 980 nm), both have a standard deviation about 10 % comparable accuracy. variables selection by searching combination moving model made it possible reduce root mean square error for more than 12 times (from 9.8 0.8 °C), 2 times(from 8.7 4.0 °С). result obtained indicatesthe proposed methods can be used localise areas with febrile temperatures medical purposes.