Development of a wing-beat-modulation scanning lidar system for insect studies

2017 ◽  
Author(s):  
Kurt M. Fristrup ◽  
Joseph A. Shaw ◽  
Martin J. Tauc
Keyword(s):  
Wing Beat ◽  
Lidar System ◽  
Scanning Lidar

Aerosol density distribution in the boundary layer measured by a scanning LIDAR system

1993 ◽  
Author(s):  
Shlomo Fastig ◽  
Y. Benayahu ◽  
Abraham Englander ◽  
E. Glaser
Keyword(s):  
Boundary Layer ◽  
Density Distribution ◽  
Lidar System ◽  
Scanning Lidar

scholarly journals A new mobile and portable scanning lidar for profiling the lower troposphere

2015 ◽  
Vol 4 (1) ◽  
pp. 35-44 ◽  
Author(s):  
C.-W. Chiang ◽  
S. K. Das ◽  
H.-W. Chiang ◽  
J.-B. Nee ◽  
S.-H. Sun ◽  
...  
Keyword(s):  
Atmospheric Aerosols ◽  
High Speed ◽  
Stimulated Raman Scattering ◽  
Layer Structure ◽  
Lower Troposphere ◽  
Sea Breeze ◽  
Industrial Area ◽  
Atmospheric Pollutants ◽  
Lidar System ◽  
Scanning Lidar

Abstract. An in-house developed mobile and portable three-dimensional scanning lidar system is discussed in this work. The system uses a stimulated Raman-scattering technique for the continuous observation of atmospheric aerosols, clouds and trace gases. This system has a fast scanning technique with a high-speed data acquisition, and permits the real-time measurement of atmospheric pollutants with the temporal resolution of 1 min. This scanning lidar system provides typical horizontal coverage of about 8–10 km while scanning; however, in zenith mode, good quality backscattered signals can be from 20 km, depending upon the laser power and sky conditions. This versatile lidar system has also overcome the drawbacks which are popular in the traditional scanning lidar systems such as complicated operation, overlap height between laser beam and telescope field of view In this system, the optical damage is reduced by using an integral coaxial transmitter and receiver. Some of the initial results obtained from the scanning lidar system are also presented. This study shows that boundary-layer structure and land–sea breeze circulation can be resolved from the developed scanning lidar system. The application of this lidar system to measure the pollutants over an industrial area is also discussed.

SNR Analysis under Multi Pulse Accumulation of Non-Scanning Lidar System

2012 ◽  
Vol 49 (5) ◽  
pp. 051401
Author(s):  
高峰 Gao Feng ◽  
杨进华 Yang Jinhua ◽  
姜成昊 Jiang Chenghao ◽  
朱彦 Zhu Yan
Keyword(s):  
Lidar System ◽  
Scanning Lidar

Spaceborne scanning lidar system (SSLS)

2005 ◽  
Author(s):  
M. Nimelman ◽  
J. Tripp ◽  
G. Bailak ◽  
J. Bolger
Keyword(s):  
Lidar System ◽  
Scanning Lidar

scholarly journals A Portable Airborne Scanning Lidar System for Ocean and Coastal Applications

2009 ◽  
Vol 26 (12) ◽  
pp. 2626-2641 ◽  
Author(s):  
Benjamin D. Reineman ◽  
Luc Lenain ◽  
David Castel ◽  
W. Kendall Melville
Keyword(s):  
Inertial Navigation System ◽  
Differential Gps ◽  
Lidar System ◽  
Ship Wake ◽  
Wave Measurements ◽  
Scanning Lidar ◽  
La Jolla ◽  
Lagoon Reef ◽  
Topographic Surveys ◽  
Rms Errors

Abstract A portable compact airborne scanning lidar system based on the Riegl LMS-Q240i has been developed and its functionality demonstrated for oceanographic and coastal measurements. Differential GPS (DGPS) and an inertial navigation system are synchronized with the lidar, resulting in vertical rms errors of less than 9 cm. Surveys with this airborne system are compared with ground-based DGPS surveys of fixed targets. Measurements of the southern California coastline and nearshore surface wave fields from 17 research flights between August 2007 and December 2008 are analyzed and discussed. The October 2007 landslide on Mt. Soledad in La Jolla, California, was documented by two of the flights. The topography, lagoon, reef, and surrounding wave field of Lady Elliot Island in Australia’s Great Barrier Reef were measured with the airborne scanning lidar system on eight research flights in April 2008. Applications of the system, including coastal topographic surveys, wave measurements, ship wake studies, and coral reef research, are presented and discussed.

Full-scale testing and platform stabilization of a scanning lidar system for planetary landing

2008 ◽  
Author(s):  
Andrew C. M. Allen ◽  
Christopher Langley ◽  
Raja Mukherji ◽  
Manny Nimelman ◽  
Jean de Lafontaine ◽  
...  
Keyword(s):  
Full Scale ◽  
Lidar System ◽  
Scanning Lidar ◽  
Planetary Landing ◽  
Full Scale Testing

Volumetric Three-Dimensional Wind Measurement Using a Single Mobile-Based LiDAR

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
M. Zendehbad ◽  
N. Chokani ◽  
R. S. Abhari
Keyword(s):  
Wind Speed ◽  
Flow Field ◽  
Measurement Technique ◽  
Complex Terrain ◽  
Wind Farm ◽  
Three Dimensional ◽  
Wind Flow ◽  
Lidar System ◽  
Scanning Lidar ◽  
Utility Scale

A novel approach to measure the wind flow field in a utility-scale wind farm is described. The measurement technique uses a mobile, three-dimensional scanning LiDAR system to make successive measurements of the line-of-sight (LOS) wind speed from three different positions; from these measurements, the time-averaged three-dimensional wind velocity vectors are reconstructed. The scanning LiDAR system is installed in a custom-built vehicle in order to enable measurements of the three-dimensional wind flow field over a footprint that is larger than with a stationary scanning LiDAR system. At a given location, multiple series of plan position indicator (PPI) and velocity azimuthal display scans are made to average out turbulent fluctuations; this series is repeated at different locations across the wind farm. The limited duration of the total measurement time period yields measurements of the three-dimensional wind flow field that are unaffected by diurnal events. The approach of this novel measurement technique is first validated by comparisons to a meteorological mast and SODAR at a meteorological observatory. Then, the measurement technique is used to characterize the wake flows in two utility-scale wind farms: one in complex terrain and the other in flat terrain. The three-dimensional characteristics of the wakes are described in the measurements, and it is observed that in complex terrain the wake has a shorter downstream extent than in flat terrain. A maximum deficit in the wind speed of 20–25% is observed in the wake. The location of the maximum deficit migrates upward as the wake evolves; this upward migration is associated with an upward pitching of the wake flow. A comparison of the measurements to a semi-empirical wake model illustrates how the measurements, at full-scale Reynolds numbers, can support further development of wake models.

Ground-based mobile scanning LIDAR for remote sensing of contrails

1994 ◽  
Vol 12 (10/11) ◽  
pp. 956-961 ◽  
Author(s):  
V. Freudenthaler ◽  
F. Homburg ◽  
H. Jäger
Keyword(s):  
Lower Stratosphere ◽  
Life Cycles ◽  
Meteorological Conditions ◽  
Air Traffic ◽  
Ice Crystals ◽  
Ice Crystal ◽  
Lidar System ◽  
Upper Troposphere ◽  
Scanning Lidar ◽  
Sample Measurement

Abstract. Air traffic is a source of trace gases in the upper troposphere and lower stratosphere. Contrails readily form from water vapor exhausts under favorable meteorological conditions. Since contrails are ice crystal clouds like natural cirrus clouds, they bear a greenhouse potential which has to be investigated. The IFU has built a scanning lidar system employing a pulsed Nd:YAG laser as the emitter and a 52-cm diameter telescope as the receiver. Signals are processed in several channels to investigate depolarization and wavelength dependencies of the light backscattered from ice crystals. These investigations are aimed at the formation and life cycles of contrails, their optical properties, and their climatological consequences in areas of dense air traffic. The experimental lidar setup is described and a sample measurement is shown.

scholarly journals Monitoring of the particles above the unpaved road by lidar technique

2013 ◽  
Vol 13 (4) ◽  
pp. 309-316
Keyword(s):  
Atmospheric Aerosols ◽  
Light Detection And Ranging ◽  
Lidar System ◽  
Unpaved Road ◽  
Range Resolution ◽  
Advantages And Disadvantages ◽  
Maximum Range ◽  
Scanning Lidar ◽  
Basic Concepts ◽  
Elastic Backscattering

Basic concepts of laser-based technique LIDAR (LIght Detection and Ranging) are discussed in this article as well as advantages and disadvantages. Presented are measurements of relative particulate concentrations above an unpaved road which were performed in a rural area near the Iowa City, Iowa, USA. The LIDAR system used in these measurements is a small, scanning LIDAR that uses elastic backscattering to obtain information on the amount of atmospheric aerosols. In the elastic LIDAR, light scattered back towards the LIDAR system from molecules and particles in the atmosphere is collected by a telescope and is detected with a photodiode. A Big Sky Laser model CFR-200 Nd:YAG laser operating at 1.064 microns is used to generate the LIDAR's outgoing signal. The laser is attached directly to the top of a 26 cm, f/10 Cassegrian telescope. A series of pulses are summed to make a single scan. A series of scans is used to build up a twodimensional map of relative atmospheric aerosol concentrations. With a maximum range of about 6-8 km, a range resolution of 2.5 m, and a time resolution of 30 s, the LIDAR is capable of very detailed mapping of aerosols.

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