Abstract

Scanners with one pair of Risley prisms are robust and precise and they can be operated continuously. In this paper, we present a new scanner based on the use of two pairs of Risley prisms. The concept was driven by the need to add flexibility to Risley prism scanners used for lidar 3D mapping applications, while maintaining compactness and robustness. The first pair covers a FOV narrower than the second pair. The second pair is used to position the first Risley pair scan pattern anywhere within its own, larger, FOV. Doing so, it becomes possible, without additional scanner components, to increase the sampling point density at a specific location, to increase the sampling uniformity of the scanned area, and, while in motion, to maintain the sampling of a specific area of interest.

Laser coarse-fine coupling tracking by cascaded rotation Risley-prism pairs

Anhu Li, Wansong Sun, Xingsheng Liu, and Wei Gong
Appl. Opt. 57(14) 3873-3880 (2018)

Inverse solutions for a Risley prism scanner with iterative refinement by a forward solution

Anhu Li, Xinjian Gao, Wansong Sun, Wanli Yi, Yongming Bian, Hongzhan Liu, and Liren Liu
Appl. Opt. 54(33) 9981-9989 (2015)

Investigation of scan errors in the three-element Risley prism pair

Anhu Li, Wei Gong, Yang Zhang, and Xingsheng Liu
Opt. Express 26(19) 25322-25335 (2018)

Limits on field of view for Risley prisms

Yuan Zhou, Ying Chen, Peidong Zhu, Guobao Jiang, Fangrong Hu, and Shixun Fan
Appl. Opt. 57(30) 9114-9122 (2018)

Rotation double prisms steered by noncircular gear pairs to scan specified nonlinear trajectories

Anhu Li, Yang Zhang, Xingsheng Liu, and Wanli Yi
Appl. Opt. 58(2) 283-290 (2019)