Abstract
An innovative flash LIDAR (light detection and ranging) system with high spatial resolution and high range precision is proposed in this paper. The proposed system consists of a polarization modulating Pockels cell (PMPC) and a micro-polarizer CCD camera (MCCD). The Pockels cell changes its polarization state with respect to time after a laser pulse is emitted from the system. The polarization state of the laser-return pulse depends on the arrival time. The MCCD measures the intensity of the returning laser pulse to calculate the polarization state, which gives the range. A spatial resolution and range precision of 0.12 mrad and 5.2 mm at 16 m were obtained, respectively, in this experiment.
Highlights
Three-dimensional imaging LIDAR systems obtain range information of an interesting target, and use that data to generate 3D images
Some applications require 3D images which have both high spatial resolution and range precision, and to address these requirements, we propose an innovative flash LIDAR system which can produce high spatial resolution 3D images with high range precision
We proposed and successfully demonstrated an innovative flash LIDAR system composed of a polarization modulating Pockels cell (PMPC) and a micro-polarizer CCD camera (MCCD)
Summary
Three-dimensional imaging LIDAR systems obtain range information of an interesting target, and use that data to generate 3D images. The range precision of the flash LIDAR system is limited by several factors, including the pulse width of the laser, the bandwidth of the detector, the temporal resolution of the timing circuit, shot noise, the timing jitters generated by electronics, and so on [8]. CMOS is used for detecting the polarization state, so that high spatial resolution 3D images can be acquired This system requires two cameras and a polarization discriminator to detect the polarization state, and it is difficult to align them so that the pixels of both cameras are looking at the same point. The large number of pixels in the MCCD can provide high resolution 3D images, and in this study it was shown that the PMPC technique can achieve a high range precision of 5.2 mm
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