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Monitoring of catalyst performance in CO2 lasers using frequency modulation spectroscopy with diode lasersClosed-cycle CO2 laser operation with removal of O2 and regeneration of CO2 can be achieved by catalytic CO-O2 recombination. Both parametric studies of the optimum catalyst formulation and long-term performance tests require on line monitoring of CO, O2 and CO2 concentrations. There are several existing methods for molecular oxygen detection. These methods are either intrusive (such as electrochemical method or mass spectrometry) or very expensive (such as CARS, UV laser absorption). Researchers demonstrated a high-sensitivity spectroscopic measurement of O2 using the two-tone frequency modulation spectroscopy (FMS) technique with a near infrared GaAlAs diode laser. Besides its inexpensive cost, fast response time, nonintrusive measurements and high sensitivity, this technique may also be used to differentiate between isotopes due to its high spectroscopic resolution. This frequency modulation spectroscopy technique could also be applied for the on-line monitoring of CO and CO2 using InGaAsP diode lasers operation in the 1.55 microns region and H2O in the 1.3 microns region. The existence of single mode optical fibers at the near infrared region makes it possible to combine FMS with optical fiber technology. Optical fiber FMS is particularly suitable for making point-measurements at one or more locations in the CO2 laser/catalyst system.
Document ID
19900015298
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wang, Liang-Guo (College of William and Mary Williamsburg, VA., United States)
Sachse, Glen (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1990
Publication Information
Publication: Low-Temperature CO-Oxidation Catalysts for Long-Life CO2 Lasers
Subject Category
Lasers And Masers
Accession Number
90N24614
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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