Fluorescent-based lifetime measurement thermometer for use at subroom temperatures (200–300 K)

Abstract
The development, construction, and evaluation of a simple ruby-based fiber optic thermometer, for use over the region 200–300 K, are described. The results are compared with those obtained from a simple theoretical model, which may be used for system calibration, and with those of previously published work, and good agreement is seen. The application of such a sensor to the food processing industry and environmental monitoring is indicated.