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Title: Fiber Optical Micro-detectors for Oxygen Sensing in Power Plants

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. Previously we described a particle-in-binder approach to immobilizing the potassium salt of a 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. We have extensively characterized two fiber sensors at high temperature. We obtain quenching ratios between pure nitrogen and 21% oxygen as high as 3.9 x at 70 C. For the first sensor at 60 C we obtained a {+-} 1% variation in the quenching ratio over 6 cycles of measurement, and monitored the device performance over 23 days. We were able to operate the second sensor continuously for 14 hours at 70 C, and the sensor quenching ratio was stable to 5% over that time period. These are promising results for a high temperature fiber optical oxygen sensor based on molybdenum chloride clusters.

Authors:
; ; ;
Publication Date:
Research Org.:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
876615
DOE Contract Number:
FC26-02NT41582
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 20 FOSSIL-FUELED POWER PLANTS; FIBER OPTICS; MONITORS; MOLYBDENUM CHLORIDES; OXYGEN; MONITORING; PERFORMANCE; POWER PLANTS; ON-LINE MEASUREMENT SYSTEMS

Citation Formats

Gregory L. Baker, Ruby N. Ghosh, D.J. Osborn III, and Po Zhang. Fiber Optical Micro-detectors for Oxygen Sensing in Power Plants. United States: N. p., 2006. Web. doi:10.2172/876615.
Gregory L. Baker, Ruby N. Ghosh, D.J. Osborn III, & Po Zhang. Fiber Optical Micro-detectors for Oxygen Sensing in Power Plants. United States. doi:10.2172/876615.
Gregory L. Baker, Ruby N. Ghosh, D.J. Osborn III, and Po Zhang. Sun . "Fiber Optical Micro-detectors for Oxygen Sensing in Power Plants". United States. doi:10.2172/876615. https://www.osti.gov/servlets/purl/876615.
@article{osti_876615,
title = {Fiber Optical Micro-detectors for Oxygen Sensing in Power Plants},
author = {Gregory L. Baker and Ruby N. Ghosh and D.J. Osborn III and Po Zhang},
abstractNote = {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 a 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. We have extensively characterized two fiber sensors at high temperature. We obtain quenching ratios between pure nitrogen and 21% oxygen as high as 3.9 x at 70 C. For the first sensor at 60 C we obtained a {+-} 1% variation in the quenching ratio over 6 cycles of measurement, and monitored the device performance over 23 days. We were able to operate the second sensor continuously for 14 hours at 70 C, and the sensor quenching ratio was stable to 5% over that time period. These are promising results for a high temperature fiber optical oxygen sensor based on molybdenum chloride clusters.},
doi = {10.2172/876615},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

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