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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 11 — Apr. 10, 2011
  • pp: 1560–1569

Performance improvement and analysis of a 1. 6 μm continuous-wave modulation laser absorption spectrometer system for CO 2 sensing

Shumpei Kameyama, Masaharu Imaki, Yoshihito Hirano, Shinichi Ueno, Shuji Kawakami, Daisuke Sakaizawa, and Masakatsu Nakajima  »View Author Affiliations


Applied Optics, Vol. 50, Issue 11, pp. 1560-1569 (2011)
http://dx.doi.org/10.1364/AO.50.001560


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Abstract

In a previous study, we developed a 1. 6 μm continuous-wave (cw) modulation laser absorption spectrometer system for CO 2 sensing and demonstrated the measurement of small fluctuations in CO 2 corresponding to a precision of 4 parts per million (ppm) with a measurement interval of 32 s . In this paper, we present the process to achieve this highly specific measurement by introducing important points, which have not been shown in the previous study. Following the results of preliminary experiments, we added a function for speckle averaging on the optical antenna unit. We additionally came up with some ideas to avoid the influences of etalon effects and polarization dependence in optical components. Because of the new functions, we realized a calibration precision of 0.006 dB (rms), which corresponds to a CO 2 concentration precision of less than 1 ppm for a 2 km path. We also analyzed the CO 2 sensing performance after the improvements described above. The measured short time fluctuation of the differential absorption optical depth was reasonably close to that calculated using the carrier-to-noise ratio of the received signal.

© 2011 Optical Society of America

OCIS Codes
(010.3640) Atmospheric and oceanic optics : Lidar
(280.3640) Remote sensing and sensors : Lidar

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: September 13, 2010
Revised Manuscript: November 12, 2010
Manuscript Accepted: December 11, 2010
Published: April 5, 2011

Citation
Shumpei Kameyama, Masaharu Imaki, Yoshihito Hirano, Shinichi Ueno, Shuji Kawakami, Daisuke Sakaizawa, and Masakatsu Nakajima, "Performance improvement and analysis of a 1.6 μm continuous-wave modulation laser absorption spectrometer system for CO2 sensing," Appl. Opt. 50, 1560-1569 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-11-1560


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