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LIDAR'S TELESCOPE
AUTO-ALIGNMENT SYSTEM FOR
CTA
Auteurs principaux : Mr. PALLOTTA, Juan
Co-auteurs : Dr. RISTORI, Pablo1; Dr. OTERO, Lidia1; Mr.
CHOUZA,Fernando1; Mr. D'ELIA, Raul1; Dr. ETCHEGOYEN, Alberto2; Dr.
QUEL, Eduardo1
Intervenant : Dr. RISTORI, Pablo1 on behalf of Mr. PALLOTTA, Juan
1.- CEILAP (CITEDEF-CONICET), UMI-IFAECI-CNRS (3351)
2.- ITeDA (CNEA-CONICET-UNSAM)
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Outlook
- Multiwavelength Scanning Raman Lidar. Main
features.
- New shelter-dome to host the lidar.
- Remote Operation System: Principles
- Auto-alignment Procedure: the hardware
- Auto-alignment Procedure: the software
- Auto-alignment Procedure: examples
- Others: Spectrometric Box
- Others: Scanning Structure
- Others: Telescope Improvements
- Conclusions
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Argentine Multi-angle Raman Lidar
Main Features:
Emission:
 Nd:Yag laser Inlite II-50 from
Continuum. Energy per pulse 60mJ
@ 532nm.
Reception Optics:
 6 reception mirrors:
 Ø = 40cm
 F=1m.
With optical fiber Ø = 1 mm at its
focus.
Detection lines: 3 elastic and 3 Raman.
 Elastic: 355, 532 and 1064 nm
 Raman: 387, 408 and 607 nm
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3
Shelter-Dome
 Based on the idea of CLUE
shelter, built from a standard
20 ft. shelter modified
completely as is shown in the
figures.
 For open/close the shelter,
hydraulic cylinders were
installed and can be
controlled manualy on site or
remotely via WiFi.
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Remote Operation System
 The whole multiangle lidar is
controlled remotely via WiFi link
between the control PC and the
lidar shelter.
 Data-taking procedure highly
automated.
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Auto-alignment Mirror System. Hardware
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Auto-alignment Mirror System. Hardware
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Auto-alignment Mirror System. Algorithm(1)
 Auto-alignment system procedure
is based on tilting the telescope,
acquiring lidar signal, and quantifying
the overlap factor.
Due to the fact that overlap factor
modulates the lidar function,
alignment condition can be assured
by evaluating the signal through a
certain range. The best overlap will
be attained when the signal reaches
its maximum value over this range
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Auto-alignment Mirror System. Algorithm(2)
 Alignment is performed evaluating the mean of the lidar signal over a
certain range.
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Auto-alignment Mirror System. Algorithm(3)
 The tilt angle of the telescopes is driven by a set of stepper motors, handled
by a RCM2200 Rabbit System microcontroller. It has a built-in Ethernet
interface with an integrated TCP/IP stack. This interface is used to link the
Multiangle Raman lidar with the control lidar PC.

The telescopes are
controlled by a selfalignment system, which is
a cooperative procedure
performed by PC software
running from the
acquisition module and
connected via WiFi to a
microcontroller.
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Alignment vs. Simulation
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Alignment under different weather
conditions
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Auto-alignment Mirror System. Algorithm(3)
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Spectrometric box
 Detection lines: 3 elastic and 3 Raman.
 Elastic: 355, 532 and 1064 nm
 Raman:
 Nitrogen: 387 and 607 nm (from 355 and
532).
 Water vapor: 408 nm (from 355 nm).
 Planned to be manufactured in collaboration of
the Advanced Modeling Laboratory at CITEDEF
with a sintering machine. This will improve
deployment time, reduce the size, weight of the
whole detection system.
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Spectrometric box
 Detection lines: 3 elastic and 3 Raman.
 Elastic: 355, 532 and 1064 nm
 Raman:
 Nitrogen: 387 and 607 nm (from 355 and
532).
 Water vapor: 408 nm (from 355 nm).
 Planned to be manufactured in collaboration of
the Advanced Modeling Laboratory at CITEDEF
with a sintering machine. This will improve
deployment time, reduce the size, weight of the
whole detection system.
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2013
New azimuth-zenithal scannign bench
 System being build with Mechanical Department of CITEDEF.
 Already tested, highly rouged and stable.
 Max. azimuth/zenithal velocity: 5 rpm.
 Max. azimuth/zenithal aceleration: 1,7 rad/s2
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New azimuth-zenithal scannign bench
 System being build with Mechanical Department of CITEDEF.
 Already tested, highly rouged and stable.
 Max. azimuth/zenithal velocity: 5 rpm.
 Max. azimuth/zenithal aceleration: 1,7 rad/s2
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Telescope technology intercomparison
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Telescope technology intercomparison
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Summary
 Argentinean multiangle Raman lidar is
already hosted in its shelter-dome and
can be operated remotely via WiFi.
 Lidar signals were taken with only one
telescope. The rest of them rest to be
installed in near future.
 Rest to implement the new scanning
bench and program the scanning
software.
The data acquisition software is already
operational, and few features left to be
done.
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2013