Sensors & Transducers Journal
(ISSN 1726- 5479)
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205.767 |
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(ISSN 1726- 5479) |
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Sensors & Transducers Journal 2008 Sensors & Transducers Journal 2007 2000-2002 S&T e-Digest Contents
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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
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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