Abstract
Materials that fluoresce efficiently and quench at high temperatures are useful for high temperature thermometry and other sensor usage. As temperature is increased above the quenching threshold, the fluorescence intensity and lifetime decrease as a simple well-behaved function of temperature. This paper discusses the spectroscopy of several rare earth-doped materials, in phosphor of crystal-line form, which belong to this class of materials. In applications, a layer of phosphor or microcrystals is applied to the surface whose temperature is to be diagnosed. The light source and detector are located remotely. Applications may involve environments with high luminous backgrounds such as in combustion engines or materials processing ovens. The surface may be rotating at high speeds. Temperature is usually determined from a measurement of the lifetime (τ) of the fluorescence but can also be ascertained from the ratio of two emission lines. Figure 1 shows portions of calibration curves (τ vs temperature) for several representative materials. It is possible to cover a wide range of temperatures by selection of the appropriate material.
© 1992 Optical Society of America
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