T. Kissel

Gd3Ga5O12:Cr—a phosphor for two-dimensional thermometry in internal combustion engines

The lifetime of thermographic phosphors needs to be short enough to resolve the temperature time scales and long enough to be properly resolved by the respective detector. Up until now, there has not been a thermographic phosphor that exhibits an adequate temperature lifetime characteristic for two-dimensional thermometry inside internal combustion engines using high speed cameras. Hence, this study suggests the material Gd3Ga5O12:Cr for this purpose. The emission spectra and the temperature lifetime characteristics were determined and the lifetime is shown to be independent of the composition and the absolute pressure of the surrounding gas phase.

The spectrally resolved luminescence decay of thermographic phosphors

A novel instrumentation for a simultaneous determination of the spectrally and temporally resolved luminescence characteristics of thermographic phosphors is introduced. For this purpose, a spectrometer was combined with a CMOS high-speed camera in order to analyse the materials La2O2S:Eu and LaAlO3:Eu. Lifetime and luminescence intensity plotted against the wavelength as well as luminescence decay curves are presented. Such information in future will guide the best choice for the monitored spectral windows in thermometry applications. The system is shown to be a powerful and efficient tool for a detailed analysis of thermographic phosphors.

Phosphor thermometry at an optically accessible internal combustion engine

Two-dimensional phosphor thermometry based on the temperature-dependent luminescence lifetime using a CMOS high-speed camera was characterized and applied to an optically accessible diesel engine. A temperature transient was monitored in trailed and in fired operation.

Thermometry of Surfaces: Application of a High Speed Camera as a Detector for Laser-Induced Phosphorescence

This study demonstrates the use of CMOS high speed camera systems for two-dimensional surface phosphor thermometry. Using Mg4FGeO6: Mn, a temperature map of a generic system was determined.