Comparison studies of the Scheimpflug lidar
technique and the pulsed lidar technique for
atmospheric aerosol sensing
Posted on 2019-11-08 - 15:23
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°. 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 profiles 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 increasing of
the measurement distance primarily due to the decreased range resolution of the SLidar
technique. The promising results suggested that the SLidar technique, featuring of short blind
range, could be suitable for aerosol sensing particularly in the planetary boundary layer.
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Mei, Liang; Ma, Teng; Kong, Zheng; Gong, Zhenfeng; Li, Hui (2019). Comparison studies of the Scheimpflug lidar
technique and the pulsed lidar technique for
atmospheric aerosol sensing. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4621247.v1
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AUTHORS (5)
LM
Liang Mei
TM
Teng Ma
ZK
Zheng Kong
ZG
Zhenfeng Gong
HL
Hui Li