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Feasibility of On-line Monitoring of the BTU Content of Natural Gas with a Near-Infrared Fiber Optic System

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Abstract:

Optical-fiber measurements coupled with near-infrared spectra in the range of 5500 to 10,000 cm−1 are used to determine the optimum spectral region for remotely monitoring the energy content of natural gas at above ambient pressures. The system was configured with a Fourier transform near-infrared spectrometer and a fused-silica fiber bundle. The total energy values at a pressure of 100 psi were determined by the partial least-squares (PLS) calibration algorithm. The precision and accuracy for predicting the BTU content of an industry standard gas sample were less than 0.4% in the lower-frequency region of 5700 to 6400 cm−1.

Keywords: Fiber optics; Gas phase; Mutlicomponent analysis; Near-infrared; Process control

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702934066974

Affiliations: 1: Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881 2: United States Tobacco Company, 800 Harrison Street, Nashville, Tennessee 37203

Publication date: June 1, 1993

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