Ms. ChengCheng Li Profile

ChengCheng Li

at Harbin Institute of Technology

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Proceedings Article | 24 November 2021 Paper

Scattering characteristics of targets at different wavelengths based on Kirchhoff scalar approximation theory

Chengcheng Li, Sining Li, Peng Jiang, Yan Qiao, Jianfeng Sun, Xin Zhou, Hailong Zhang, Qi Wang

Proceedings Volume 12065, 120650Q (2021) https://doi.org/10.1117/12.2603998

KEYWORDS: Scattering, Laser scattering, Reflectivity, Optical simulations, Aluminum, Data modeling, Target recognition, Target detection

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Bi-directional reflection distribution function (BRDF) is a common method to study the laser scattering characteristics of targets, and it is an important parameter for the theoretical demonstration of laser active detection, target recognition and classification. Scholars at home and abroad have proposed many mature BRDF models to describe the scattering characteristics of different targets. However, almost all of these models do not take into account the effect of incident wavelength on scattering characteristics. In addition, limited by the frequency modulation range of the laser, the existing BRDF measurement devices cannot obtain the BRDF data of the target at any wavelength, which restricts the application of the existing BRDF model. In view of this limitation, a method is proposed to calculate the unknown wavelength BRDF data using the BRDF measurement data of known wavelengths. Firstly, based on the Kirchhoff approximation theory, the spatial distribution of the scattered light field of the metal aluminum target at any wavelength was simulated and analyzed. Secondly, the error of the theoretical simulation model was analyzed through the experimental data. Finally, the BRDF data at any wavelength were calculated using the simulation data and the experimental data with known wavelengths. The final results showed that at the 1064nm wavelength, the RMSE value of the calculated data obtained by this method is 0.3553, which is 0.2233 smaller than the RMSE value of the simulation data.This method is effective in calculating the BRDF of metal aluminum targets at different wavelengths.

Proceedings Article | 7 October 2020 Paper

Experimental research on polarized LIDAR imaging based on GM-APD

Changrui Qiu, Jianfeng Sun, Xin Zhou, Peng Jiang, Chengcheng Li, Qi Wang

Proceedings Volume 11571, 1157107 (2020) https://doi.org/10.1117/12.2577063

KEYWORDS: Polarization, Wave plates, LIDAR, Target detection, Pulsed laser operation, Imaging systems, Laser energy, Photons

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Aiming at the problem that the Geiger-mode Avalanche Photodiode (GM-APD) is susceptible to background noise and the detection effect decreases during the day, based on the polarization GM-APD detection model, a set of GM-APDbased polarized lidar imaging experimental equipment is proposed. Using this equipment to image the target in the simulated sunlight environment, the effect of polarization detection on the echo triggering performance was studied. The results show that, compared with the non-polarized system, the polarized system reduces the impact of noise on target detection, improves the image quality, and reduces the false alarm probability of the image. When the laser single pulse energy is 400nJ, and the polarization angle is 135° , the trigger probability of the metal plate is increased by 10.5%, and its false alarm probability is reduced by 4.6%; the trigger probability of the rough wood board is reduced by 15.2%, and its false alarm probability is reduced 8.9%.Due to the deterioration of imaging results caused by background noise, it is proposed to use polarization degree images for further background filtering to extract a more complete target contour. This research work provides experimental support for the effective detection of GM-APD lidar during the day.

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