written by James E. Parks

Remote temperature measurements can be made by measuring the lifetimes of fluorescence of light emitted by a phosphor excited with pulsed ultraviolet light. The technique was first used to measure the temperature of the rotator of a centrifuge used to separate isotopes of uranium while it was spinning at an ultrahigh angular velocity. This experiment is a study of the principles involved and measurements are made of the lifetimes of a light from a phosphor as a function of temperature to establish a calibration function. While the initial measurement techniques involved a pulsed nitrogen laser, this experiment uses a newly developed and affordable apparatus that uses a pulsed ultraviolet LED for the measurement. Lifetimes on the order of 1 to 50 µsec are determined.

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Last Modified July 9, 2013

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