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Proceedings Paper

Fiber optic oxygen sensor using metal-halide cluster luminescence
Author(s): Ruby N. Ghosh; Gregory L. Baker; Cory Ruud; Daniel G. Nocera
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Paper Abstract

We report on a reflection mode fiber optic oxygen sensor based on the 3O2 quenching of the red emission from hexanuclear molybdenum chloride clusters. Measurements of the probe operating in a 0 - 20% gaseous oxygen environment have been obtained, which is suitable for biological and automotive applications. The luminescence signal increases with decreasing oxygen concentration in accordance with theory. We observe clearly resolvable steps in the sensor response for changes of 0.1% absolute oxygen concentration in the 0 to 1.0% range. The response time of the fiber probe is less than or equal to 30 s, limited at present by the gas mixing system. The sensor is fabricated by immobilizing the clusters in an oxygen permeable polymer at the end of an UV transmissive optical fiber. For a 1.5 m long fiber pumped at 325 nm, the auto-fluorescence is less than 4% of the reflected luminescence signal from 600 - 850 nm, enabling remote probing of oxygen in harsh environments. The present probe is thermally stable to 200 degrees Celsius, limited by the polymer matrix. Since the clusters are synthesized at 1000 degrees Celsius, immobilization of the clusters in an inert sol-gel matrix is an attractive alternative. This will enable oxygen sensing in gaseous environments at elevated temperatures as well as liquid environments with varying salinity and pH.

Paper Details

Date Published: 9 December 1999
PDF: 7 pages
Proc. SPIE 3860, Fiber Optic Sensor Technology and Applications, (9 December 1999); doi: 10.1117/12.372953
Show Author Affiliations
Ruby N. Ghosh, Michigan State Univ. (United States)
Gregory L. Baker, Michigan State Univ. (United States)
Cory Ruud, Michigan State Univ. (United States)
Daniel G. Nocera, Michigan State Univ. and Massachusetts Institute of Technology (United States)


Published in SPIE Proceedings Vol. 3860:
Fiber Optic Sensor Technology and Applications
Michael A. Marcus; Brian Culshaw, Editor(s)

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