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Journal of Sensors
Volume 2016, Article ID 6019439, 10 pages
Research Article

An Optimized Method Based on Digitalized Lissajous Curve to Determine Lifetime of Luminescent Materials on Optical Fiber Sensors

Department of Electrical and Electronic Engineering, Public University of Navarra, 31006 Pamplona, Spain

Received 3 January 2016; Revised 29 April 2016; Accepted 10 May 2016

Academic Editor: Hai Xiao

Copyright © 2016 Adrián Ridruejo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A method is proposed to determine lifetime of luminescent emissions based on the phase shift measurement employing the digitalized Lissajous representation: this diagram has been typically used with analogical algorithms, whereas the proposed method is performed in digital domain, showing an improved accuracy and repeatability. The procedure is studied and tested with two different oxygen sensors that show different sensitivities and signal levels in order to confirm the no influence of the signals intensity on the calibration process. The computational cost of the proposed method is low, which makes it possible to monitor in real time luminescence sensors based on reversible quenching with a potential low cost system based on a digital signal processor (DSP).