Three Dimensional Imaging LIDAR And Optical System

Current research on scannerless three dimensional imaging lidar mainly focus on the phase scannerless imaging lidar, the multiple-slit streak tube imaging lidar and the flash lidar. But there are the disadvantages, such as short detection range, the complicated structure of vacuum unit and lacking the grayscale images corresponding to the three kinds of lidar listed above. Three dimensional imaging LIDAR is the combination of photographic technique and the technique of distance detection and ranging. One dimensional information is come from imaging, another dimensional information can be acquried by moving the measurement platform, and the third dimensional infromation can be computed with the time of laser pulse flight. With modern computer technologies, it is convenient to reconstruct the three demensional model of the real world. As one of the most efficient and effective techniques to get the three dimensional information, LIDAR is widely used in military reconnaissance, disaste relief, agriculture, forestry, ecology, digital city and so on.This paper presents a novel three-dimensional laser imaging technology, which shapes the beam to be narrow band-like and cuts it into multiple segments in space at transmitter end. In every segments, it is encoded, so that each section has a identify information from others. At the receiving end, the required number of the sensor unit is reduced by mergering the light from corresponding sequence optical fiber. That is to say it is able to achieve high-resolution three-dimensional imaging with the sensor array having less units. Compared with other three dimensional imaging method, this new method has the advantages of high rate imaging, large field of view, simple structure and small size. This paper describes the theory of push-broom three dimensional imaging laser radar technology, focusing on optical system design and detailed analysis of the key technologies involved in the optical system, including beam shaping, coding and the use of fiber-optic image bundle beam coupling. Finally, the experiment is done to test the performance of optical system.