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Proceedings Paper

Intensity based luminescent optical fiber oxygen sensor using quantum dots
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Paper Abstract

The suitability of semiconductor nanoparticles to provide a reference signal in luminescence based chemical sensors is addressed. A CdSe-ZnS nanocrystal, with emission peak at 520 nm is used to provide a reference signal. Measurements of oxygen concentration, which are based on the dynamic quenching of the luminescence of a Ruthenium complex, are performed. Both dye and the nanocrystal are immobilized in a sol-gel matrix and are excited by a blue LED. Results are presented showing that the ratio between the reference and the sensor signals is highly insensitive to fluctuations of the excitation optical power. Preliminary results show that nanocrystals could be used to measure temperature and provide a reference signal.

Paper Details

Date Published: 23 May 2005
PDF: 4 pages
Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); doi: 10.1117/12.623643
Show Author Affiliations
Pedro Jorge, Univ. of North Carolina/Charlotte (United States)
INESC Porto (Portugal)
Univ. do Porto (Portugal)
M. Mayeh, Univ. of North Carolina/Charlotte (United States)
R. Benrashid, Waveguide Solutions, Inc. (United States)
P. Caldas, Univ. do Porto (Portugal)
INESC (Portugal)
J. L. Santos, Univ. do Porto (Portugal)
INESC (Portugal)
Faramarz Farahi, Univ. of North Carolina/Charlotte (United States)

Published in SPIE Proceedings Vol. 5855:
17th International Conference on Optical Fibre Sensors
Marc Voet; Reinhardt Willsch; Wolfgang Ecke; Julian Jones; Brian Culshaw, Editor(s)

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