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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 4 — Feb. 1, 2013
  • pp: B93–B101

Low cost “laserless” FTIR spectrometer on the farm for real-time nitrous oxide soil emission measurements

Karl Henrik Haugholt, Matthieu Lacolle, Marion O’Farrell, Atle Honne, Kari Anne Hestnes Bakke, and Aina Lundon  »View Author Affiliations


Applied Optics, Vol. 52, Issue 4, pp. B93-B101 (2013)
http://dx.doi.org/10.1364/AO.52.000B93


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Abstract

A low-cost Fourier transform infrared (FTIR) instrument was developed where the traditional He–Ne reference laser was replaced by a low-cost linear encoder. An RMS sampling error of less than 20 nm was achieved by oversampling both the interferogram and the encoder signal and then resampling the interferogram using a correction table for the encoder. A gas calibration model was developed for the system, which was chosen to have a stroke length of 21 mm and, thereby, a resolution of 0.4cm1 after apodization. The instrument was mounted on a vehicle and employed in an agricultural field test for measuring soil emissions, in particular nitrous oxide (N2O). The concentration of N2O was measured with a root mean squared error of 6 ppb. The results compared well with lab-based gas chromatography measurements.

© 2013 Optical Society of America

OCIS Codes
(300.0300) Spectroscopy : Spectroscopy
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(300.6340) Spectroscopy : Spectroscopy, infrared

History
Original Manuscript: October 17, 2012
Revised Manuscript: December 20, 2012
Manuscript Accepted: January 3, 2013
Published: January 30, 2013

Citation
Karl Henrik Haugholt, Matthieu Lacolle, Marion O’Farrell, Atle Honne, Kari Anne Hestnes Bakke, and Aina Lundon, "Low cost “laserless” FTIR spectrometer on the farm for real-time nitrous oxide soil emission measurements," Appl. Opt. 52, B93-B101 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-4-B93

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