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Non scanning 3D imaging laser radar technology research

Author: FengBo
Tutor: PengRenJun
School: University of Electronic Science and Technology
Course: Optical Engineering
Keywords: scannerless 3D imaging laser radar the strobe the grating
CLC: TN958.98
Type: Master's thesis
Year: 2012
Downloads: 91
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Abstract


Imaging laser radar has been subject to scholars. Traditional laser imaging radar due to the limitations of the device, mostly two-dimensional scanning by a single point detector for3D images, but also a linear array detector with the one-dimensional scanning3D images. The presence of the scanner increases the system volume, reducing the reliability and stability. Since the1990s, non-scanning3D imaging radar research attention. No need to scan devices, scanning and imaging radar has many significant advantages:small size, compact structure, high frame rate, large field, high reliability. Scan imaging including two direction, one research and development of3D sensors, one2D devices to achieve the3D imaging capabilities.3D sensor for each pixel ranging functions, its cost is very high, and the pixel scale is still relatively limited.2D sensor into a3D image can take advantage of the large pixel scale of the2D device, easy to achieve high angular resolution.2D device without scanning3D imaging systems have been proposed several options, but there are still more or less shortcomings, such as the role of distance is far enough, have high requirements on the laser bandwidth and power, and basically need expensive imaging device ICCD imaging devices require high-pressure control, most remain in the theoretical and experimental research stage. In general, the2D device without scanning3D imaging radar from the practical application of the distance from, it also dictates that we continue to study the new method of the new system of scanning and imaging.This thesis is based on existing use of ICCD imaging devices for3D imaging technology, proposed use to control the ICCD gating time to get3D like in this way reduces the difficulty of control on the ICCD gain, while reducing the laserrequirements. The article also presents a rotating radial grating-based3D imaging radar program, which uses a grating on the emission of light echo modulation, and high-sensitivity CCD integration effect of3D imaging on the scene. Discussed in detail the principle of these two scenarios and problems that may exist, the common feature of both scenarios:ask for much of the launch system and detector, simple operation, do not need complex control circuits. Simulation results show that the imaging program on the former, if the parameter is properly controlled, the fall time of the pulse laser and ICCD gating rise time3D imaging is almost negligible; single point imaging solutions of the latter ranging and imaging the simulation results show that this kind of imaging modalities in the imaging principle is feasible. The final design of the experimental modulation grating disk-based non-scanning3D imaging system, and confirmed by the imaging component is not at the field of view will bring great error.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar: institutional sub- > Optical positioning radar,laser radar
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