1. Optimization of the LiDAR optical design for measurement of the aerosol extinction vertical profile.
Alessia Sannino *1, Antonella Boselli 3, Gaetano Sasso4, Nicola Spinelli1, Xuan Wang2 .
1 Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM) and Dip. Fisica “E. Pancini”, Università degli Studi di Napoli Federico II, Napoli, Italy , 2 Istituto Superconduttori, Materiali innovativi e Dispositivi (SPIN) – CNR, Italy , 2 Istituto di Metodologie per l’Analisi Ambientale (IMAA) – CNR, Italy ,4ALA Advanced LiDAR Applications s.r.l., Napoli, Italy

2. OVERVIEW Why low range atmosphere information are so important
LiDAR capabilities
Our proposal
Results and Conclusions
25 September, Anacapri

3. ARMOSPHERIC PARTICLES
INTRODUCTION
Radius (range covered:107)
Anthropogenic
Source
ARMOSPHERIC PARTICLES
MOLECULAS
AEROSOL
Shape
p, T → δ(r)
Geographical source
Generation processes
Natural Source
25 September, Anacapri

4. INTRODUCTION Lidar Equation: Overlap Function Backscattering coeff.
Extinction coeff.
Overlap Function
A. L. Oramas
COAXIAL
BIAXIAL
25 September, Anacapri
25 September, Capri

5. PERFORMING LIDAR PROTOTYPE FEATURES
500mm
400mm
Output laser wavelength
355nm
Repetition Frequency
2kHz
Telescope
200mm Cassegrain
F/n
2.5
Channels
355S, 355p, 386
Weight
35kg
290mm
25 September, Capri
25 September, Anacapri

6. RESULT I Raman Overlap (res.60m) Horizontal Overlap (res.15m)
compared with
Simulated Overlap function
(res 15m)
120m
25 September, Anacapri
25 September, Capri

7. Comparison of the signals measured with different Lidar systems
RESULT II
Comparison of the signals measured
with different Lidar systems
MALIA is
- the fixed system based at the Physics Department of University “Federico II” di Napoli
Actris and EARLINET network.
3 beta and 2 alpha
2 depolarization channels
telescope field of view at 1.33 mrad
300 mm Newtonian telescope
532nm and 355nm nm
25 September, Anacapri
25 September, Capri

8. RESULT III Comparison of the signals measured with different
Lidar systems
ACTRIS facilities
Cassegrain telescope
200mm/48mm
Field of view: 2.5 mrad
25 September, Capri
25 September, Anacapri

9. SUMMARY AND CONCLUSION
A study on several optical assembly has been conducted in order to find the best configuration system which guaranteed a good signal started from the lowest possible altitude.
The optimized optical system has been obtained with a choice on F-number of 2.5.
This optimized optical system has been realized for a compact Lidar system which allowed to test both with simulated and measured results its Overlap function. The test results shown an Overlap function of a few tens on meters (~120m).
25 September, Anacapri
25 September, Capri

10. Thanks!

11. RESULT III Comparison of the signals measured with different
Lidar systems
ACTRIS facilities
Cassegrain telescope
200mm/48mm
Field of view: 2.5 mrad
25 September, Capri
25 September, Anacapri