Abstract

We have demonstrated the 1.6μm cw modulation hard-target differential absorption lidar system for CO2 sensing. In this system, ON and OFF wavelength laser lights are intensity modulated with cw signals. Received lights of the two wavelengths from the hard target are discriminated by modulation frequencies in the electrical signal domain. The optical circuit is fiber based, and this makes the system compact and reliable. It is shown that a stable CO2 concentration measurement corresponding to a fluctuation of 4 ppm (rms) (ppm is parts per million) has been achieved in 32 s measurement intervals and the 1 km path.

© 2009 Optical Society of America

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References

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  1. R. M. Menzies and D. M. Tratt, Appl. Opt. 42, 6569 (2003).
    [CrossRef] [PubMed]
  2. G. J. Koch, B. W. Barns, M. Petros, J. Y. Beyon, F. Amzajerdian, J. Yu, R. E. Davis, S. Ismail, S. Vay, M. J. Kavaya, and U. N. Singh, Appl. Opt. 43, 5092 (2004).
    [CrossRef] [PubMed]
  3. G. J. Koch, J. Y. Beyon, F. Gibert, B. W. Barnes, S. Ismail, M. Petros, P. J. Petzar, J. Yu, E. A. Modlin, K. J. Davis, and U. N. Singh, Appl. Opt. 47, 944 (2008).
    [CrossRef] [PubMed]
  4. P. H. Flamant, in Proceedings of the International Laser Radar Conference (2006), p. 347.
  5. A. Amediek, A. Fix, M. Wirth, and G. Ehret, in Proceedings of the 23rd International Laser Radar Conference (2006), p. 143.
  6. S. Kameyama and Y. Hirano, “Differential absorption lidar apparatus having multiplexed light signals with two wavelengths in a predetermined beam size and beam shape,” U.S. patent 7,361,922 (April 22, 2008).

2008 (1)

2004 (1)

2003 (1)

Amediek, A.

A. Amediek, A. Fix, M. Wirth, and G. Ehret, in Proceedings of the 23rd International Laser Radar Conference (2006), p. 143.

Amzajerdian, F.

Barnes, B. W.

Barns, B. W.

Beyon, J. Y.

Davis, K. J.

Davis, R. E.

Ehret, G.

A. Amediek, A. Fix, M. Wirth, and G. Ehret, in Proceedings of the 23rd International Laser Radar Conference (2006), p. 143.

Fix, A.

A. Amediek, A. Fix, M. Wirth, and G. Ehret, in Proceedings of the 23rd International Laser Radar Conference (2006), p. 143.

Flamant, P. H.

P. H. Flamant, in Proceedings of the International Laser Radar Conference (2006), p. 347.

Gibert, F.

Hirano, Y.

S. Kameyama and Y. Hirano, “Differential absorption lidar apparatus having multiplexed light signals with two wavelengths in a predetermined beam size and beam shape,” U.S. patent 7,361,922 (April 22, 2008).

Ismail, S.

Kameyama, S.

S. Kameyama and Y. Hirano, “Differential absorption lidar apparatus having multiplexed light signals with two wavelengths in a predetermined beam size and beam shape,” U.S. patent 7,361,922 (April 22, 2008).

Kavaya, M. J.

Koch, G. J.

Menzies, R. M.

Modlin, E. A.

Petros, M.

Petzar, P. J.

Singh, U. N.

Tratt, D. M.

Vay, S.

Wirth, M.

A. Amediek, A. Fix, M. Wirth, and G. Ehret, in Proceedings of the 23rd International Laser Radar Conference (2006), p. 143.

Yu, J.

Appl. Opt. (3)

Other (3)

P. H. Flamant, in Proceedings of the International Laser Radar Conference (2006), p. 347.

A. Amediek, A. Fix, M. Wirth, and G. Ehret, in Proceedings of the 23rd International Laser Radar Conference (2006), p. 143.

S. Kameyama and Y. Hirano, “Differential absorption lidar apparatus having multiplexed light signals with two wavelengths in a predetermined beam size and beam shape,” U.S. patent 7,361,922 (April 22, 2008).

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Figures (5)

Fig. 1
Fig. 1

System configuration of the 1.6 μ m cw modulation hard-target DIAL system.

Fig. 2
Fig. 2

Configuration of the wavelength locking circuit for the ON wavelength.

Fig. 3
Fig. 3

Measured result on wavelength stability with temperature changing at the phase modulator.

Fig. 4
Fig. 4

Result of the calibration test with environmental temperature changing.

Fig. 5
Fig. 5

Time record of CO 2 concentration measured by the DIAL system and that measured by the in situ CO 2 sensor.

Tables (1)

Tables Icon

Table 1 System Parameters of the System

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