High-resolution three-dimensional imaging based on all-fiber photon-counting Lidar system

A 1064 nm photon-counting Lidar system was experimentally demonstrated to realize high-resolution three-dimensional(3D) imaging all day. Herein, the optical system was composed of all-fiber components, which improved the system stability. Objects in long distance could be detected by Lidar system through whole machine scanning and the scanning view reached 360° in horizon and ±30° in azimuth direction. Also, the geometry distortion was avoided compared to swing mirror scanning. Additionally, the spatial resolution was increased by using a sub-pixel scanning method. Finally, 3D images could be reconstructed by a multi-range reconstruction algorithm with self-adaptive noise threshold. Results showed that a 3D object 3.1 km away was successfully reconstructed in daytime with clear features. The ranging accuracy was 0.11 m. The spatial resolution was about 0.11 m, beyond the diffraction limit of the optical system.