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| Titel |
Developing a portable, autonomous aerosol backscatter lidar for network or remote operations |
| VerfasserIn |
K. B. Strawbridge |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 3 ; Nr. 6, no. 3 (2013-03-26), S.801-816 |
| Datensatznummer |
250017849
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| Publikation (Nr.) |
 copernicus.org/amt-6-801-2013.pdf |
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| Zusammenfassung |
| Lidar has the ability to detect the complex vertical structure of the
atmosphere and can therefore identify the existence and extent of aerosols
with high spatial and temporal resolution, making it well suited for
understanding atmospheric dynamics and transport processes. Environment
Canada has developed a portable, autonomous lidar system that can be
monitored remotely and operated continuously except during precipitation
events. The lidar, housed in a small trailer, simultaneously emits two
wavelengths of laser light (1064 nm and 532 nm) at energies of
approximately 150 mJ/pulse/wavelength and detects the backscatter signal at
1064 nm and both polarizations at 532 nm. For laser energies of this
magnitude, the challenge resides in designing a system that meets the
airspace safety requirements for autonomous operations. Through the
combination of radar technology, beam divergence, laser cavity interlocks and
using computer log files, this risk was mitigated. A Continuum Inlite small
footprint laser is the backbone of the system because of three design
criteria: requiring infrequent flash lamp changes compared to previous
Nd : YAG Q-switch lasers, complete software control capability and a
built-in laser energy monitoring system. A computer-controlled interface was
designed to monitor the health of the system, adjust operational parameters
and maintain a climate-controlled environment. Through an Internet
connection, it also transmitted the vital performance indicators and data
stream to allow the lidar profile data for multiple instruments from near
ground to 15 km, every 10 s, to be viewed, in near real-time via a website.
The details of the system design and calibration will be discussed and the
success of the instrument as tested within the framework of a national lidar
network dubbed CORALNet (Canadian Operational Research Aerosol Lidar
Network). In addition, the transport of a forest fire plume across the
country will be shown as evidenced by the lidar network, HYSPLIT back
trajectories, MODIS imagery and CALIPSO overpasses. |
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