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Vol. 113, Issue 2, February 2010, pp. 18-32




Crossed-Optical-Fiber Oxygen Sensors with Intensity and Temperature Referencing
for Use in High-Spatial-Resolution Sensor Arrays


1Maria Veronica RIGO, 2Robert OLSSON and 1Peter GEISSINGER

1University of Wisconsin-Milwaukee, Department of Chemistry & Biochemistry,

3210 N. Cramer Street, Milwaukee, WI 53211-3029, USA

2Milwaukee School of Engineering, Department of Physics & Chemistry,

1025 North Broadway, Milwaukee, WI 53202-3109, USA

Fax: (414) 229-5530, tel.: (414) 229-5230

E-mail: geissing@uwm.edu



Received: 23 January 2010   /Accepted: 19 February 2010   /Published: 26 February 2010


Abstract: We investigated the fabrication of an optical-fiber oxygen sensor based on luminescence quenching of a ruthenium (II) complex for our optical-fiber-sensor arrays. Sensor regions are located between two optical fibers forming orthogonal fiber-fiber junctions. Ruthenium molecules are embedded in a photo-polymerized hydrogel matrix, which is covalently attached to the surface-modified fiber-core. For the optical evaluation of these sensors, the fiber sensor junctions are placed in a flow cell. When gaseous oxygen diffuses into the hydrogel, it quenches the luminescence, with the degree of quenching correlating with oxygen partial pressure; this behavior was indeed observed in the crossed-fiber configuration with a sensor response time of 1 s. To account for intensity fluctuations, an oxygen-insensitive dye in an adjacent fiber-fiber junction was used for intensity referencing, which markedly improved the response curves. The oxygen sensor was also corrected for the temperature-dependence of the ruthenium complex using the dye Kiton Red.


Keywords: Optical fiber, Oxygen sensor, Ruthenium complex, Hydrogel, High-Spatial-Resolution


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