FIBER OPTICAL MICRO-DETECTORS FOR OXYGEN SENSING IN POWER PLANTS

Technical Report · Fri Apr 01 04:00:00 EST 2005

DOI:https://doi.org/10.2172/840102· OSTI ID:840102

Baker, Gregory L; Ghosh, Ruby N; Osborn, III, D J; Zhang, Po

A reflection mode fiber optic oxygen sensor that can operate at high temperatures for power plant applications is being developed. The sensor is based on the {sup 3}O{sub 2} quenching of the red emission from hexanuclear molybdenum chloride clusters. One of the critical materials issues is to demonstrate that the luminescent cluster immobilized in the sol-gel porous support can withstand high temperature. At the same time the sol-gel matrix must have a high permeability to oxygen. Using a potassium salt of the molybdenum clusters, K{sub 2}Mo{sub 6}Cl{sub 14}, we have established the conditions necessary for deposition of optical quality sol-gel films. From spectroscopic measurements of the film we have shown that the cluster luminescence is stable following heat cycling of 54 hours at 200 C. Quenching of a factor of 1.5X between pure nitrogen and 21% oxygen was observed from in-situ measurements of films heated directly at 200 C. An automated system for characterizing fiber optic oxygen sensors up to 220 C with a temporal resolution better than 10 s is under construction. We estimate a signal of 6 x 10{sup 8} photons/s after complete quenching in 21% oxygen. These are promising results for a high temperature fiber optical oxygen sensor based on molybdenum chloride clusters.

• Research Organization: Michigan State University (US)
• Sponsoring Organization: (US)
• DOE Contract Number: FC26-02NT41582
• OSTI ID: 840102
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
47 OTHER INSTRUMENTATION
DESIGN
FIBER OPTICS
FOSSIL-FUEL POWER PLANTS
LUMINESCENCE
MOLYBDENUM CHLORIDES
ON-LINE MEASUREMENT SYSTEMS
OXYGEN
PERFORMANCE
PERMEABILITY