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论文类型：期刊论文

发表时间：2019-11-10

发表刊物：APPLIED OPTICS

收录刊物：SCIE

卷号：58

期号：32

页面范围：8981-8992

ISSN号：1559-128X

摘要：The Scheimpflug lidar (SLidar) technique has been recently developed for various remote sensing applications, where the lidar signal is detected by an image sensor according to the Scheimpflug principle instead of the time-of-flight principle. Comparison studies between the SLidar technique and the conventional pulsed lidar technique are crucial for understanding the principle as well as the measurement results of the SLidar technique. In this work, a 520-nm Scheimpflug lidar system and a 532-nm pulsed lidar system have been developed for comparison studies. Atmospheric remote measurements as well as statistical analysis have been carried out on a near-horizontal path and on a slant direction with an elevation angle of 30 degrees. The temporal-spatial variations of the atmospheric backscattering maps measured by the 520-nm SLidar system and the 532-nm pulsed lidar system generally agreed well. The median extinction coefficient measured by the SLidar and the pulsed techniques has shown similar temporal evolution during the near-horizontal comparison study, and a correlation coefficient of 0.99 has been achieved through statistical analysis on all lidar measurements. Moreover, the root-mean-square error (RMSE) ratio for each extinction coefficient profile has also been evaluated, and the mean value of the RMSE ratio for all lidar measurements was about 11% in homogeneous atmospheric conditions. During slant comparison studies, the RMSE ratio between the SLidar curve and the pulsed lidar curve was less than 5% in the region of 0.5-2 km, and it generally increased with the increase of measurement distance, primarily due to the decreased range resolution of the SLidar technique. The promising results suggested that the SLidar technique, featuring a short blind range, could be suitable for aerosol sensing, particularly in the planetary boundary layer. (C) 2019 Optical Society of America