KEYWORDS: Digital micromirror devices, LIDAR, 3D image processing, Laser applications, 3D acquisition, Mirrors, Stereoscopy, Laser imaging, Micromirrors, Imaging systems
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. In this paper we develop a novel 3D imaging LiDAR that works in the way of pushbroom. It
converts the time of flight (TOF) into the space with digital mirror device (DMD). When pulse arrives at the DMD, the
micromirrors are shifting from a status to another. Because the TOFs of pulses hit on different targets are different, there
will be the streak on the focal plane array (FPA) of the sensor, which shows the relative position. The relative position of
the streak can be used to reconstruct the range profile of the target. 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. First,
this article introduces the theory of digital micromirror laser 3D imaging LiDAR, and then it analyses the technical indicator
of the core component. At last, it gives the process of computing the detection range, theoretically demonstrating the
feasibility of this technology.
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