Zhang Peng, Du Xiaoping, Zhao Jiguang, Song Yishuo, Chen Hang
Appl Opt. 2017 May 1;56(13):3889-3894. doi: 10.1364/AO.56.003889.
Two high resolution flash LIDAR systems based on polarization modulation are demonstrated in this paper. One utilizes a polarization beam splitter (PBS) and two charge coupled device (CCD) arrays; the other utilizes a micro-polarizer array and a CCD array. Compared with the traditional flash LIDAR systems, the main advantage of the presented flash LIDAR systems is replacing high bandwidth detectors with a polarization modulator and low bandwidth detectors. The polarization modulator is used to modulate the polarization state of the received laser pulse in time and the range information can be mapped into the intensity received by the low bandwidth detectors. The distance between the target and the system can be derived from intensity images that can be read out using low bandwidth detectors. Comparisons of the two systems indicate that they have the same range precision. Both demonstrated systems can achieve a high range precision of several millimeters. The system using a PBS and two CCD arrays can obtain higher resolution images, but it is crucial to align the two CCD arrays precisely.
本文展示了两种基于偏振调制的高分辨率闪光激光雷达系统。一种利用偏振分束器（PBS）和两个电荷耦合器件（CCD）阵列；另一种利用微偏振器阵列和一个CCD阵列。与传统的闪光激光雷达系统相比，所展示的闪光激光雷达系统的主要优点是用偏振调制器和低带宽探测器取代了高带宽探测器。偏振调制器用于及时调制接收到的激光脉冲的偏振态，距离信息可以映射到低带宽探测器接收到的强度中。目标与系统之间的距离可以从使用低带宽探测器读出的强度图像中得出。两种系统的比较表明它们具有相同的距离精度。两个展示的系统都能实现几毫米的高距离精度。使用PBS和两个CCD阵列的系统可以获得更高分辨率的图像，但精确对准两个CCD阵列至关重要。
