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On-line wavelength calibration of pulsed laser for CO2 DIAL sensing

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Abstract

Accurate on-line wavelength calibration is a crucial procedure for sensing atmospheric CO2 using the DIAL technique. Drastic fluctuations in the intensity of a pulsed laser pose a great challenge for accurate on-line wavelength determination and stabilization, resulting in CO2 retrievals lacking the desired accuracy for global climate change and carbon cycle research. To tackle this problem, a two-stage wavelength calibration method based on Voigt fitting was proposed in this work. Simulation analysis demonstrated that the proposed method is superior to the conventional method and provides wavelength calibration results with an accuracy of 0.1 pm when the noise level does not exceed than 5 %. This conclusion was confirmed through experiments with real signals. Furthermore, simulation analysis revealed that the proposed method could yield results with an accuracy of 0.1 pm by increasing the number of sample points, even for signals with noise levels of up to 20 %. This is a promising feature that could facilitate the development of DIAL systems without gas cells.

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Acknowledgments

This work was supported by National Nature Science Foundation of China (NFFC) No. 41127901 and No. 41201362.

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Authors and Affiliations

  1. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Luoyu Road 129, Wuhan, 430079, China

    Ge Han, Wei Gong, Hong Lin, Xin Ma & Chengzhi Xiang

  2. School of Physics and Electronic-Information Engineering, Hubei Engineering University, Xiaogan, 432000, Hubei, China

    Hong Lin

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Correspondence to Wei Gong.

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Han, G., Gong, W., Lin, H. et al. On-line wavelength calibration of pulsed laser for CO2 DIAL sensing. Appl. Phys. B 117, 1041–1053 (2014). https://doi.org/10.1007/s00340-014-5925-8

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