National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Fiber Optical Micro-detectors for Oxygen Sensing in Power Plants. Quarterly Report, October 1, 2004-December 31, 2004.

DE2005838219

Publication Date	2005
Personal Author	Baker, G. L.; Ghosh, R. N.; Osborn, D. J.
Page Count	22
Abstract	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 1 hour at 250 C. Quenching of a factor of 4X between pure nitrogen and 21% oxygen was observed for films cured directly at 200 C. These are promising results for a high temperature fiber optical oxygen sensor based on molybdenum chloride clusters.
Keywords	Thermal power plants Oxygen sensors Fiber optics Luminescence Molybdenum chlorides Permeability Reflection Potassium chlorides Sol-gel processes
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Michigan State Univ., East Lansing. Dept. of Chemistry.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200520

Fiber Optical Micro-detectors for Oxygen Sensing in Power Plants. Quarterly Report, October 1, 2004-December 31, 2004.

Fiber Optical Micro-detectors for Oxygen Sensing in Power Plants. Quarterly Report, October 1, 2004-December 31, 2004.
DE2005838219

Publication Date	2005
Personal Author	Baker, G. L.; Ghosh, R. N.; Osborn, D. J.
Page Count	22
Abstract	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 1 hour at 250 C. Quenching of a factor of 4X between pure nitrogen and 21% oxygen was observed for films cured directly at 200 C. These are promising results for a high temperature fiber optical oxygen sensor based on molybdenum chloride clusters.
Keywords	Thermal power plants Oxygen sensors Fiber optics Luminescence Molybdenum chlorides Permeability Reflection Potassium chlorides Sol-gel processes
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Michigan State Univ., East Lansing. Dept. of Chemistry.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200520