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High Temperature Oxygen Sensing Using K2Mo6Cl14 Luminescence

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4 Author(s)
Po Zhang ; Dept. of Phys. & Astron., Michigan State Univ., East Lansing, MI ; D. J. Osborn ; G. L. Baker ; R. N. Ghosh

A reflection mode optical sensing system for monitoring oxygen in high temperature gas flows, 25-220degC and 500 sccm, is presented. The sensor is based on 3O2 quenching of the red emission from K2Mo6Cl14, one member of a family of hexanuclear molybdenum chloride clusters. One advantage of using inorganic Mo-clusters as the lumophore is the lack of sensitivity to gases typically present in a coal-fired boiler due to the triplet nature of the transition from the excited to ground state. The sensor is prepared by dip-coating fiber tip in a sol-gel solution containing K2Mo6Cl14 particle clusters. Drying and aging yields a composite film with K2Mo6Cl14 immobilized in a porous silica matrix. The composite film deposited on a planar substrate was characterized via in-situ spectroscopic measurement up to 200degC. The emission intensity is constant following 56 cumulative hours of heating at 200degC, demonstrating long-term stability at high temperature

Published in:

IEEE Sensors, 2005.

Date of Conference:

Oct. 30 2005-Nov. 3 2005