Mr. Weijie Wang Profile

Weijie Wang

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Publications (6)

Proceedings Article | 13 December 2024 Paper

Research on calibration method for optical characteristics of pedestrian targets in autonomous vehicle testing

Weijie Wang, Houping Wu, Chundi Zheng, Tao Liang, Shaozhe Cui, Xikuai Xie, Guojin Feng, Haiyong Gan, Yingwei He

Proceedings Volume 13498, 134980C (2024) https://doi.org/10.1117/12.3047661

KEYWORDS: Calibration, Bidirectional reflectance transmission function, Light sources, Cameras, Reflection, Standards development, 3D acquisition, 3D imaging standards, Unmanned vehicles, Safety

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Proceedings Article | 13 December 2024 Paper

Research on spectral retro-reflection standard measurement and calibration device

Chundi Zheng, Guojin Feng, Tianshuo Li, Houping Wu, Weijie Wang, Tao Liang, Xikuai Xie, Qiaozhang Zhang, Haiyong Gan, Yingwei He

Proceedings Volume 13498, 134980B (2024) https://doi.org/10.1117/12.3047641

KEYWORDS: Calibration, Reflection, Standards development, Measurement devices, Reflectivity, Light sources, Safety, Spectroscopy, Roads, Precision optics

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Proceedings Article | 13 December 2024 Paper

Dataset coverage evaluation for aircraft detection in SAR images using angle classification method

Shaozhe Cui, Weijie Wang, Xiaolu Zhan, Zhe Peng, Yuanrui Dong, Yingwei He, Guojin Feng, Wende Liu, Haiyong Gan

Proceedings Volume 13496, 1349614 (2024) https://doi.org/10.1117/12.3048170

KEYWORDS: Object detection, Synthetic aperture radar, Education and training, Target detection, Image processing, Image classification, Data modeling, Scattering, Data processing, Computer vision technology

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Proceedings Article | 4 December 2024 Paper

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

Proceedings Volume 13283, 132834J (2024) https://doi.org/10.1117/12.3037247

KEYWORDS: Reflectivity, Reflection, LIDAR, Mirrors, Sensors, Calibration, Autonomous driving, Integrating spheres, Measurement devices, Reliability

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Proceedings Article | 11 October 2024 Paper

Optical path design facing θ/θ reflectance measurement of test targets for autonomous vehicles

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

Proceedings Volume 13278, 132781D (2024) https://doi.org/10.1117/12.3032329

KEYWORDS: LIDAR, Reflectivity, Reflection, Spectrometers, Optical fibers, Calibration, Unmanned vehicles, Design, Incident light, Autonomous driving

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As a pair of "wise eyes" for autonomous vehicles to perceive the external environment, Lidar (Light detecting and Ranging) plays a crucial role in detecting target characteristics in driving scenarios. To ensure the accuracy and reliability of Lidar, precise measurement of target reflectance under θ/θ reflection conditions is an indispensable step. Determining the reflectance value of targets under θ/θ reflection conditions is a critical part of completing Lidar calibration and traceability. When designing the θ/θ optical path, a significant challenge lies in achieving almost perfect overlap between the lighting and detecting paths while ensuring system compactness and measurement accuracy. Fiber optic spectrometers, known for their fast and accurate measurement capabilities, can be directly applied to measure target reflectance. Therefore, combining a compact θ/θ reflection optical path with a fiber optic spectrometer is key to achieving small-angle reflectance measurements for Lidar, marking an important step towards improving the calibration and traceability chain. For Lidar under θ/θ reflection conditions, various "N+1" lighting/detecting combined optical paths based on fiber bundles have been designed. Simulation analysis of these designs has been conducted using ray-tracing methods, comparing the uniformity and optical flux efficiency of the tested samples. The results indicate that when N=6, the uniformity and incident flux efficiency are optimal. Based on the simulation results, a "6+1" lighting/detecting fiber optic spectrometer has been developed, and actual measurements have been performed on a standard diffuser. The measurement data shows that the angular accuracy under 0/0 and 45/45 conditions is better than 0.1°, and the optimal relative error of the reflection measurement results in the 905nm laser wavelength was less than 0.5%. This meets the requirements for on-site measurements and is significant for further improving the Lidar measurement traceability chain.

Proceedings Article | 30 April 2024 Paper

Illumination pattern and path control through laser beam steering using a calibrated two-dimensional galvo scanner

Qi Zang, Shaozhe Cui, Weijie Wang, Tao Liang, Xiaolu Zhan, Wende Liu, Yingwei He, Zhengang Lu, Haiyong Gan

Proceedings Volume 13153, 1315318 (2024) https://doi.org/10.1117/12.3018684

KEYWORDS: Laser scanners, Galvanometers, Calibration, Mirrors, Beam controllers, Servomechanisms, Light sources and illumination, Laser frequency, Beam steering, Scanners

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