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

Baker, G. L. ; Ghosh, R. N. ; Osborn, D. J.

Technical Information Center Oak Ridge Tennessee

关键词: Thermal power plants;    Oxygen sensors;    Fiber optics;    Luminescence;    Molybdenum chlorides;   

RP-ID  :  DE2005838219

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

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.