Fiber Optical Micro-detectors for Oxygen Sensing in Power Plants

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

Michigan State University

关键词: On-Line Measurement Systems;    Monitoring;    Oxygen;    Fiber Optics;    Molybdenum Chlorides;   

DOI  :  10.2172/883174
RP-ID  :  none
RP-ID  :  FC26-02NT41582
RP-ID  :  883174

美国|英语

来源: UNT Digital 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. Previously we described a particle-in-binder approach to immobilizing the potassium salt of the molybdenum cluster, K{sub 2}Mo{sub 6}Cl{sub 14}, at the tips of optical fibers. Compared to previous methods, the particle-in-binder approach affords fibers with greatly improved mechanical properties. The response of the sensor to oxygen at 40, 70 and 100 C was measured in 2-21% gas phase oxygen. The normalized sensor signal is linear with molar oxygen concentration and fits the theoretical Stern-Volmer relationship. Although the sensitivity decreases with temperature, at 100 C the sensitivity is 160 [O{sub 2}]{sup -1}. These are promising results for a high temperature fiber optical oxygen sensor based on molybdenum chloride clusters.