Research on absolute measurement of reflectance at small angles near LiDAR reflection conditions

Tao Liang; Weijie Wang; Guojin Feng; Chundi Zheng; Guozheng Song; Xikuai Xie; Shaozhe Cui; Qi Zang; Xiaolu Zhan; Haiyong Gan; Qiaoning Yang; Yingwei He

doi:10.1117/12.3037247

4 December 2024 Research on absolute measurement of reflectance at small angles near LiDAR reflection conditions

Tao Liang, Weijie Wang, Guojin Feng, Chundi Zheng, Guozheng Song, Xikuai Xie, Shaozhe Cui, Qi Zang, Xiaolu Zhan, Haiyong Gan, Qiaoning Yang, Yingwei He

Author Affiliations +

Proceedings Volume 13283, Conference on Spectral Technology and Applications (CSTA 2024); 132834J (2024) https://doi.org/10.1117/12.3037247
Event: Conference on Spectral Technology and Applications (CSTA 2024), 2024, Dalian, China

Abstract

Accurate traceability of LiDAR(Light Detection and Ranging) is still a difficult issue in the autonomous driving industry, as it serves as crucial 'eyes' for perception. To address this issue, a device was developed for absolute measurement of reflectance at small angles near θ/θ reflection condition of LiDAR. Through the fine design of the small angle optical path, the problem of mutual occlusion between the light source and the detector due to the actual size under this condition was optimized, the accurate value of the incident and reflected radiant flux were obtained, and the absolute measurements of the reflectance with the minimum angle better than 0.1°/-0.1° were realized. To verify the accuracy and reliability of the device, one 1 -inch diameter UV-enhanced aluminum film plane mirror and one 1-inch diameter silver film plane mirror were used. Absolute reflectance measurements were conducted at light source wavelengths of 532nm and 905nm, with reflection angles of 12°/-12°and 45°/-45°. The measured results were then compared with their calibrated values, achieving an optimal relative deviation of 0.4%, thereby providing preliminary validation of the device's measurement accuracy and reliability. Meanwhile, the light source and detection part of this device are planned to be extended to 1550 nm, providing better support for LiDAR reflection traceability in the autonomous driving industry.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Tao Liang, Weijie Wang, Guojin Feng, Chundi Zheng, Guozheng Song, Xikuai Xie, Shaozhe Cui, Qi Zang, Xiaolu Zhan, Haiyong Gan, Qiaoning Yang, and Yingwei He "Research on absolute measurement of reflectance at small angles near LiDAR reflection conditions", Proc. SPIE 13283, Conference on Spectral Technology and Applications (CSTA 2024), 132834J (4 December 2024); https://doi.org/10.1117/12.3037247

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KEYWORDS

Reflectivity

Reflection

LIDAR

Mirrors

Sensors

Calibration

Autonomous driving

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