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In situ H2O and temperature detection close to burning biomass pellets using calibration-free wavelength modulation spectroscopy
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (TEC-Lab)ORCID iD: 0000-0002-5065-7786
2015 (English)In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 119, no 1, 45-53 p.Article in journal (Refereed) Published
Abstract [en]

The design and application of an H2O/temperature sensor based on scanned calibration-free wavelength modulation spectroscopy (CF-WMS) and a single tunable diode laser at 1.4 μm is presented. The sensor probes two H2O absorption peaks in a single scan and simultaneously retrieves H2O concentration and temperature by least-squares fitting simulated 1f-normalized 2f-WMS spectra to measured 2f/1f-WMS signals, with temperature, concentration and nonlinear modulation amplitude as fitting parameters. Given a minimum detectable absorbance of 1.7×10-5 cm-1 Hz-1/2, the system is applicable down to an H2O concentration of 0.1 % at 1000 K and 20 cm path length (200 ppm·m). The temperature in a water-seeded lab-scale reactor (670-1220 K at 4 % H2O) was determined within an accuracy of 1 % by comparison with the reactor thermocouple. The CF-WMS sensor was applied to real- time in situ measurements of H2O concentration and temperature time histories (0.25 s time resolution) in the hot gases 2 to 11 mm above biomass pellets during atmospheric combustion in the reactor. Temperatures between 1200 and 1600 K and H2O concentrations up to 40 % were detected above the biofuels. 

Place, publisher, year, edition, pages
2015. Vol. 119, no 1, 45-53 p.
National Category
Renewable Bioenergy Research Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-99509DOI: 10.1007/s00340-015-6026-zISI: 000352292500007OAI: oai:DiVA.org:umu-99509DiVA: diva2:787580
Funder
Bio4EnergySwedish Energy Agency
Available from: 2015-02-10 Created: 2015-02-09 Last updated: 2017-12-04Bibliographically approved

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Qu, ZhechaoSchmidt, Florian M.
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