Application of CdSe-nanocrystallite-doped glass for temperature measurements in fiber sensors

A temperature fiber sensor based on CdSe-nanocrystallite-doped phosphate gl ass as a sensing element is reported. This glass is shown to exhibit a reve rsible temperature-induced absorption edge shift at temperatures less than the annealing temperature of the glass (<370 degrees C). A dual-wavelength detection scheme based on a reflective grating and bi-cell photodiode is em ployed to eliminate the effects of variable signal losses in the intensity- dependent sensor. A sensor prototype, tested in the temperature range of -2 0 to +120 degrees C, is shown to exhibit a linear response to temperature v ariations, (C) 2000 Society of Photo-Optical Instrumentation Engineers. [S0 091-3286(00)02308-4].