Thesis

Temperature and stress measurements based on praseodymium (Pr³⁺) doped optical fibre

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Awarding institution
  • University of Strathclyde
Date of award
  • 2013
Thesis identifier
  • T13639
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Abstract
  • In this thesis, praseodymium (Pr³⁺) doped optical fibre is investigated as a physical sensor measuring temperature and stress. The project investigates the spectroscopic properties of Pr³⁺doped silica fibre as a potential sensor for environmental properties such as temperature and stress. The measurements have two parts: spectral and decay time. In the spectral part, Pr³⁺ doped optical fibre is excited by an OPO laser or a continuous-wave Argon-ion laser. The intensity and wavelength of the fluorescence are used to determine the effect of temperature and stress. In the decay time measurements, the fibre is excited by the OPO laser. These measurements revealed a 2 components decay - a fast component in the order of 5µs and a slower component in the order of 300µs. Within the experimental constraints on the range on temperature and stress of 0-100 and 0-900g respectively, the wavelengths of the three emission peaks and the excitation peak do not show any obvious change and the FWHM of the three emission peaks also does not show any trends or changes. Only two of the three emission peaks were measured in the decay time measurements. The decay time is measured in the temperature range 20-100°C, the stretch range 0-450g and compression range 0-5kg. Two components of the decay time for the two emission peaks are detected in the experiments. The fast component of the decay time of both emission peaks with temperature shows quite little decrease. The slow component of the decay time of the two emission peaks shows a positive trend with weight. These results follow similar trend for other rare earth doped optical fibre [1].
Resource Type
DOI
Date Created
  • 2013
Former identifier
  • 1004586

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