1 / 20

LIDAR'S TELESCOPE AUTO-ALIGNMENT SYSTEM FOR CTA

LIDAR'S TELESCOPE AUTO-ALIGNMENT SYSTEM FOR CTA. Auteurs principaux : Mr. PALLOTTA, Juan Co-auteurs : Dr. RISTORI, Pablo 1 ; Dr. OTERO, Lidia 1 ; Mr. CHOUZA,Fernando 1 ; Mr. D'ELIA, Raul 1 ; Dr. ETCHEGOYEN, Alberto 2 ; Dr. QUEL, Eduardo 1

yuki
Download Presentation

LIDAR'S TELESCOPE AUTO-ALIGNMENT SYSTEM FOR CTA

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LIDAR'S TELESCOPEAUTO-ALIGNMENT SYSTEM FORCTA 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)

  2. 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

  3. Argentine Multi-angle Raman Lidar Main Features: • Emission: • Nd:Yag laser Inlite II-50 from Continuum. Energy per pulse 60mJ @ 532nm. • Reception Optics: • 6 receptionmirrors: • Ø = 40cm • F=1m. With optical fiber Ø = 1 mm at its focus. • Detectionlines: 3 elastic and 3 Raman. • Elastic: 355, 532 and 1064 nm • Raman: 387, 408 and 607 nm 3

  4. 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.

  5. 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.

  6. Auto-alignment Mirror System. Hardware

  7. Auto-alignment Mirror System. Hardware

  8. 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

  9. Auto-alignment Mirror System. Algorithm(2) • Alignment is performed evaluating the mean of the lidar signal over a certain range.

  10. 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 self-alignment system, which is a cooperative procedure performed by PC software running from the acquisition module and connected via WiFi to a microcontroller.

  11. Alignment vs. Simulation

  12. Alignment under different weather conditions

  13. Auto-alignment Mirror System. Algorithm(3)

  14. Spectrometric box • Detectionlines: 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.

  15. Spectrometric box • Detectionlines: 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. Same optics being used at Comodoro Rivadavia’s Lidar

  16. 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

  17. 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 Same unit operational at CITEDEF

  18. Telescope technology intercomparison

  19. Telescope technology intercomparison

  20. 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.

More Related