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Differential absorption measurements of carbon dioxide using a temperature tunable distributed feedback diode laser

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3 Author(s)
Repasky, K.S. ; Electrical and Computer Engineering Department, Cobleigh Hall Room 610, Montana State University, Bozeman, Montana 59717 ; Humphries, Seth ; Carlsten, J.L.

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The design and performance of an absorption measurement instrument for monitoring carbon dioxide are presented. The instrument is based on a temperature tunable distributed feedback diode laser capable of tuning between 2.001 and 2.005 μm. Within this wavelength range are 12 absorption lines for carbon dioxide and 9 absorption lines for water vapor. Initial measurements of laser transmission as a function of carbon dioxide concentration are made using a 2 m long absorption cell. The measured values compare well with the expected values using the known line strength of the carbon dioxide absorption feature. Carbon dioxide measurements over a 77.5 m path length made outside the laboratory show the potential for carbon dioxide concentration monitoring.

Published in:

Review of Scientific Instruments  (Volume:77 ,  Issue: 11 )

Date of Publication:

Nov 2006

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