Weak signal detection system and noise analysis for aerosol detection lidar

Zong-jia Qiu; Si-ying Chen; Yin-chao Zhang; Yu-zhao Wang; Guo-qiang Ni

doi:10.1117/12.836669

31 August 2009 Weak signal detection system and noise analysis for aerosol detection lidar

Zong-jia Qiu, Si-ying Chen, Yin-chao Zhang, Yu-zhao Wang, Guo-qiang Ni

Proceedings Volume 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging; 73824R (2009) https://doi.org/10.1117/12.836669
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

Abstract

The information of location and scattering intensity of the target can be detected by lidar system. The physical characteristics of the target can be retrieved from the scattering intensity. Since the corresponding relationship between the echo signal intensity and the detection range requires to be measured accurately, a weak signal detection system of lidar is needed, with strong electromagnetic immunity, high sensitivity and wide dynamic range. In this paper, firstly, various characteristics of echo signals obtained by aerosol detection lidar, including the signal intensity and frequency spectrum are analyzed. Secondly, the influencing factors associated with those signal characteristics, such as photoelectric detector response time and the dynamic range, are also described. At last, a signal-to-noise ratio model for lidar is established. The influencing factors of the photomultiplier tube shot noise, dark current noise, and background radiation noise to the final SNR can be assessed. Meanwhile, some effective ways to reduce the interference noise are discussed.

Citation Download Citation

Zong-jia Qiu, Si-ying Chen, Yin-chao Zhang, Yu-zhao Wang, and Guo-qiang Ni "Weak signal detection system and noise analysis for aerosol detection lidar", Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 73824R (31 August 2009); https://doi.org/10.1117/12.836669

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