A new three-dimensional nonscanning laser imaging system based on the illumination pattern of a point-light-source array

Abstract

One of the most important goals of research on three-dimensional nonscanning laser imaging systems is the improvement of the illumination system. In this paper, a new three-dimensional nonscanning laser imaging system based on the illumination pattern of a point-light-source array is proposed. This array is obtained using a fiber array connected to a laser array with each unit laser having independent control circuits. This system uses a point-to-point imaging process, which is realized using the exact corresponding optical relationship between the point-light-source array and a linear-mode avalanche photodiode array detector. The complete working process of this system is explained in detail, and the mathematical model of this system containing four equations is established. A simulated contrast experiment and two real contrast experiments which use the simplified setup without a laser array are performed. The final results demonstrate that unlike a conventional three-dimensional nonscanning laser imaging system, the proposed system meets all the requirements of an eligible illumination system. Finally, the imaging performance of this system is analyzed under defocusing situations, and analytical results show that the system has good defocusing robustness and can be easily adjusted in real applications.

Speed Measurement of the Moving Targets Using the Stepping Equivalent Range-Gate Method

“…In contrast, the array imaging lidar uses a two-dimensional detector array as a receiver to simultaneously acquire a large amount of 3D information on the target surface without waiting for an acquisition time proportional to the number of pixels to be measured, which enables fast 3D detection with large resolution. Therefore, compared with the scanning lidar system, the advantages of surface array imaging lidar, such as small size, fast imaging frame rate, high resolution, etc., make it become a research hot spot at home and abroad [ 6 , 7 , 8 , 9 ].…”