Rayleigh-backscattering doppler broadening correction for differential absorption lidar

Lanlan Fan; Yinchao Zhang; Siying Chen; Pan Guo; He Chen

doi:10.1117/12.2214707

5 November 2015 Rayleigh-backscattering doppler broadening correction for differential absorption lidar

Lanlan Fan, Yinchao Zhang, Siying Chen, Pan Guo, He Chen

Proceedings Volume 9795, Selected Papers of the Photoelectronic Technology Committee Conferences held June–July 2015; 979517 (2015) https://doi.org/10.1117/12.2214707
Event: Selected Proceedings of the Photoelectronic Technology Committee Conferences held June-July 2015, 2015, Hefei, Suzhou, and Harbin, China

Abstract

The spectral broadening by Rayleigh backscattering can cause large changes in water vapor echo signals, causing errors when the water vapor concentration is inversed by differential absorption lidar (DIAL). A correction algorithm is proposed to revise the errors due to the effect of laser spectral broadening. The relative errors of water vapor are calculated in cases of different aerosol distribution and temperature changes before and after correction. The results show that measurement errors due to the Doppler broadening are more than 5% before correction and a 2% measurement error after corrected for the case of a smooth, background aerosol distribution. However, due to the high aerosol gradients and strong temperature inversion, errors can be up to 40% and 10% with no corrections for this effect, respectively. The relative errors can reduce to less than 2% after correction. Hence, the correction algorithm for Rayleigh Doppler broadening can improve detection accuracy in H₂O DIAL measurements especially when it is applied to high aerosol concentration or strong temperature inversion.

Citation Download Citation

Lanlan Fan, Yinchao Zhang, Siying Chen, Pan Guo, and He Chen "Rayleigh-backscattering doppler broadening correction for differential absorption lidar", Proc. SPIE 9795, Selected Papers of the Photoelectronic Technology Committee Conferences held June–July 2015, 979517 (5 November 2015); https://doi.org/10.1117/12.2214707

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