Abstract
We present, to the best of our knowledge, a new method for differential temperature measurement based on thermal sensitivity of the fluorescence lifetime of thermographic phosphors. Pairs of thermographic phosphors are excited with intensity-modulated light at frequencies and . The phase shift of the summary fluorescence intensity beat signal envelope is measured. A prototype of a fluorometric differential temperature sensor is developed, and feasibility of the method is experimentally demonstrated with a crystal and the transition for high thermal sensitivity. The observed linear dependence between envelope phase shift and temperature difference agrees with the theoretical prediction. Sensitivity of was achieved. This method could also be applied to differential measurements of any parameter affecting fluorescence lifetime.
© 2018 Optical Society of America
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