SMN Bariloche

(Rainproof, Remote operation: yes)

The lidar is operated at the Bariloche International Airport by the Argentinean Meteorological Sevice assisted remotely by CEILAP (Centro de Investigaciones en Láseres y Aplicaciones). Other operators may be needed to perform 20/24 measurements. This lidar was conceived to monitor range-resolved (100 m to 13 km AGL) aerosol optical properties from the IR to the near UV spectral region in the whole troposphere. Its emission system is a 20 Hz – 150 mJ (1064 nm) solid state Nd:YAG laser (Brilliant – Quantel). The fundamental laser line is doubled and tripled to obtain 532 nm and 355 nm respectively. The backscattered radiation is collected by an f/10, 2 m focal length Cassegrainian telescope, focused into a 1 mm diameter optical fiber to achieve a field of view of 0.5 mrad. The detection unit is a dichroic/interference filter-based polychromator unit that separates the elastic and Raman-shifted backscattered radiation. The detection units are photomultiplier modules (Hamamatsu H6780-03) for the ultraviolet and H6780-20 visible wavelengths and a detector module (LICEL) based on an NIR enhanced Si-avalanche photodiode set (EG&G) for the infrared wavelength.

Rayleigh detection: 1064, 532 and 355 nm Raman detection: 607, 408 and 387 nm (nocturnal measurement only)

Transmitter

• Laser type: Solid stale Nd:YAG laser (Brilliant - Quantel)

• Wavelength: 1064 nm, 532 nm, 355nm

• Pulse energy: 360 mJ @ 1064nm

• Repetition: 20 Hz

• Divergence: < 0.7 mrad

• Pulse duration: 4 - 6 nm

• Expander: not used

• FOV: ---

• Rain proof: yes

• Emission: Coaxial

Receiver

• Telescope: 

  • Schmit-Cassegrain

  • Diameter = 20 cm

  • Focal length = 2 m

• Detectors: 

  • PMT 355 - Hamamatsu H6780-03

  • PMT 532 - Hamamatsu H6780-20

  • APD 1064 - LICEL APD 3.0

  • PMT 387 - Hamamatsu H6780-03

  • PMT 408 - Hamamatsu H6780-03

  • PMT 607 - Hamamatsu H6780-20

Data acquisition

• Detection range (approximate): 350 m - 13 km

• Range resolution: 7,5 m

• Elastic channels: Transient recorder. 12 Bit, 20Ms/s. (TR20-12bit-LICEL)

• Raman channels: Transient recorder. 250 MHz. (TR20-12bit-LICEL)