Abstract
A technique is experimentally demonstrated, allowing one, with a time resolution of a few ns, to remotely measure the temperature distribution on surfaces that are accessible to light. The surfaces are coated with a polymer containing fluorescing dye. When excited at the desired moment with a flashlight this is induced to fluoresce. As the fluorescence yield is temperature dependent, the temperature distribution during the fluorescence decay time can be uniquely determined. The fluorescence is recorded first in thermal equilibrium and then at the elevated temperature for which knowledge of the temperature distribution is desired. From the ratio of the spatially resolved fluorescence yields the temperature distribution can be evaluated. With spatial resolutions down to 2 μm, temperatures in the range 20°–120°C are measured with accuracies of ±1°C, where the measurement intervals are as short as 18 ns.
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References
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Free running flashlamp-pumped erbium laser (JK 2000)
Zeiss IM 35 inverse microscope for fluorescence microscopy
Fischer NANOLITE KL-L with air filling at atmospheric pressure
EG & G FX 280
Philips XX 1410 proximity focused micro-channel plate
Matrox Mvp-AT
The response function of the imaging system was experimentally determined at spatial frequencies ranging from 1 linepair/mm to 228 linepairs/mm by taking digital pictures of the calibrated line patterns of a resolution target and then determining the modulation transfer function of the imaging system with image processing methods
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Dedicated to Prof. Dr. Herbert Welling on the occasion of his 60th birthday