Multiwavelength Raman Lidar is intended for profiling of microphysical particle parameters in 0.05 – 10 mm radii range.
Atmospheric aerosol of natural and anthropogenic origin is one of the key factors influencing the planet radiation balance. For the modeling of corresponding forcing the information about vertical distribution of particle parameters is demanded. Multiwavelength Raman lidars are the promising tools to provide height resolved microphysical particle parameters without perturbing the aerosol or its surroundings.
Laser beam is expanded by of-axis parabolic collimator. Laser and collimator are fixed on the receiving telescope, thus allowing to perform the measurements at any angle to horizontal Seven-channels LICEL electronic unit makes possible simultaneous analog and photon counting measurements.
- Backscattering coefficients (355, 532, 1064 nm)
- Extinction coefficients (355, 532 нм)
- Particle depolarization ratio ar 355 нм
- Angstrom parameter
- Mean and effective radius
- Number, surface and volume density
- Refractive index
- Water vapor mixing ratio
|Laser type||Nd:YAG Brilliant B|
|Pulse energy||300 / 250 / 200 mJ @
1064 / 532 / 355 nm
|Pulse duration||6 ns|
|Repetition rate||10 Hz|
|Beam diameter (after collimation)||40 mm|
|Beam divergence||<0.2 mrad|
|Elastic scattering||355, 532, 1064 nm|
|Nitrogen Raman scattering||387, 608 nm|
|Raman scattering by water vapor||408 nm|
Newton receiving telescope
|Focal length||1200 mm|
|Field of view||0.25 – 2 mrad|
Variation of the particle backscattering coefficient at 1064 nm. Measurements were performed in Istanbul area since 9 :00 pm to 6:00 am in May 2009.