Optoelectronic systems for addressing Ru oxygen sensors: their design optimization and calibration process

E. A.D. Austin; John P. Dakin

doi:10.1117/12.456098

14 February 2002 Optoelectronic systems for addressing Ru oxygen sensors: their design optimization and calibration process

E. A.D. Austin, John P. Dakin

Author Affiliations +

Proceedings Volume 4578, Fiber Optic Sensor Technology and Applications 2001; (2002) https://doi.org/10.1117/12.456098
Event: Environmental and Industrial Sensing, 2001, Boston, MA, United States

Abstract

The paper describes research at Southampton University, aimed at optimizing the design of fibre-remoted dissolved-oxygen sensors, using immobilized fluorescent Ru²⁺ indicators. The design and construction of two types of fluorescence lifetime monitoring units, one type using phase-delay-monitoring and the other using photon-counting, is described. Results from a detailed theoretical study of a photon-counting RLD fluorescence lifetime sensor are presented, with specific attention to noise aspects. By numerical modeling of an analytical solution, the optimum time-window boundaries for the photon-counting system are identified. A surprising result is that the signal/noise can actually be improved by not using photon counts from all of the exponential decay, but leaving a time-gap in the measurement improves lifetime accuracy. Our previously reported Ti³⁺ - doped sapphire fluorescence-lifetime calibration probe is described, and a new method for RLD interrogator verification using the probe is demonstrated.

Citation Download Citation

E. A.D. Austin and John P. Dakin "Optoelectronic systems for addressing Ru oxygen sensors: their design optimization and calibration process", Proc. SPIE 4578, Fiber Optic Sensor Technology and Applications 2001, (14 February 2002); https://doi.org/10.1117/12.456098

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