Koziol, Bernhard Georg (2004) Temperature and strain dependence of fluorescence in praseodymium-doped silica optical fibre. Research Master thesis, Victoria University of Technology.

Abstract

Temperature and strain measurement is an important requirement in many industrial processes. In areas where high electromagnetic fields, flammable environments or other adverse environments limit the use of electronic-based sensors, optical fibrebased sensors can be incorporated. In this thesis, praseodymium (Pr3)-doped silica optical fibres were investigated for their temperature and strain properties using the fluorescence lifetime technique. These fibres had a Pr3+-ion concentration of 700 ppm and lOOOppm, the latter of which was co-doped with Al+3 at a concentration of 4000 ppm. The Pr3+ ion were excited with light from an argon-ion laser, centred at a wavelength of 488 nm. Two fluorescence wavelengths that emanated from the 1D2 energy level were detected and measured, as the doped optical fibre was subject to temperatures between 20 and 700 °C, or was strained over a range from 0 to 1957 µε. Results from these measurements indicate that the temperature and strain sensitivity from these two fibres is comparable to that of other rare-earth-doped silica optical fibres. The fluorescence lifetime strain-dependence from the optical fibre with a Pr3+ concentration of 1000 ppm had a negative trend with increasing strain; this is contrary to other rare-earth-doped silica fibre strain sensitivities.

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