Fabrication of ruby phosphor sheet for the fluorescence thermometer application

A fluorescence thermometer using the temperature dependence of the phase shift of fluorescence response was developed using a ruby phosphor sheet. The ruby phosphor sheet was compounded of ruby powder and silicone resin. The fluorescence lifetime from the ruby phosphor sheet was measured with a phase shift measurement technique. The phase shift of the fluorescence response from the ruby phosphor sheet decreased linearly with temperature from $270to350K$⁠. The ruby phosphor sheet is found to be powerful tool for temperature measurement, and can be used for noncontact temperature measurement.