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Calibration-free scanned wavelength modulation spectroscopy – application to H2O and temperature sensing in flames
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.ORCID-id: 0000-0002-5065-7786
2015 (engelsk)Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 23, nr 12, s. 16492-16499Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A calibration-free scanned wavelength modulation spectroscopy scheme requiring minimal laser characterization is presented. Species concentration and temperature are retrieved simultaneously from a single fit to a group of 2f/1f-WMS lineshapes acquired in one laser scan. The fitting algorithm includes a novel method to obtain the phase shift between laser intensity and wavelength modulation, and allows for a wavelengthdependent modulation amplitude. The scheme is demonstrated by detection of H2O concentration and temperature in atmospheric, premixed CH4/air flat flames using a sensor operating near 1.4 μm. The detection sensitivity for H2O at 2000 K was 4 × 10−5 cm−1 Hz-1/2, and temperature was determined with a precision of 10 K and absolute accuracy of ~50 K. A parametric study of the dependence of H2O and temperature on distance to the burner and total fuel mass flow rate shows good agreement with 1D simulations.

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2015. Vol. 23, nr 12, s. 16492-16499
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URN: urn:nbn:se:umu:diva-105147DOI: 10.1364/OE.23.016492ISI: 000356902500128OAI: oai:DiVA.org:umu-105147DiVA, id: diva2:823570
Tilgjengelig fra: 2015-06-18 Laget: 2015-06-18 Sist oppdatert: 2018-06-07bibliografisk kontrollert

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Qu, ZhechaoGhorbani, RaminValiev, DamirSchmidt, Florian M

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