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Data of Lidar Laboratory of IO PAS

The list and description of collected data


List of the experiments of the Lidar Laboratory:

Detailed List of the Collected Data
Experiments of the Lidar Laboratory
SymbolDateDescriptionLidar-AerLidar-ChlLidar-Flu
HEL'92October 1992Baltic Shore Experiment at Hel PeninsulaYesNoNo
BAEX-1October 1993International Shore Experiment in LubiatowoYesNoNo
HEL'93November 1993Baltic Shore Experiment at Hel PeninsulaYesNoNo
HEL'94(1)January 1994Baltic Shore Experiment at Hel PeninsulaYesNoNo
MAY94May 1994R/V Oceania Cruise in South BalticYesYesNo
HEL'94(2)June 1994Baltic Shore Experiment at Hel PeninsulaYesNoNo
MOLOSeptember 1994Baltic Shore Experiment in Sopot, PolandYesNoNo
BAEX-2September 1994International Shore Experiment in LubiatowoYesNoNo
NOV94November 1994R/V Oceania Cruise in South BalticYesYesNo
HEL'94(3)November 1994Baltic Shore Experiment at Hel PeninsulaYesNoNo
HEL'95February 1995Baltic Shore Experiment at Hel PeninsulaYesNoNo
MAR95March 1995R/V Oceania Cruise in South BalticYesYesNo
CETN'95May 1995Baltic Shore Experiment in CetniewoYesNoNo
JUN95June 1995R/V Oceania Cruise in South BalticYesYesNo
BAEX-3September 1995International Shore Experiment in LubiatowoYesNoNo
OCT95October 1995R/V Oceania Cruise in South BalticNoYesNo
MAR96March 1996R/V Oceania Cruise in South BalticNoYesYes
APR96April 1996R/V Oceania Cruise in South BalticNoYesYes
MAY96May 1996R/V Oceania Cruise in South BalticNoYesYes
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Definitions of the measured values

Aerosol concentration: total number of suspended particles in volume unit of air. Measured every 7.5 m along the optical path of lidar impulse. The measurement is not direct: the value measured directly is the backscattered signal and output energy of the laser for several wavelengths (laser lines). Backscattered signal for a few wavelengths allows for the solution of the inverse lidar problem to get the concentration and rogue shape of concentration size distribution.

  Aerosol Concentration Definition Parameters:

Spectra of sea-water fluorescence: emitted spectra of fluorescence of sea-water and Raman bands measured with the lidar system (1024 spectral canals). The sea surface is illuminated with a laser beam at a chlorophyll "a" absorption band. The ratio of the integrals of the chlorophyll "a" emission band to the Raman band allows the calculation of a relative index of chlorophyll fluorescnce. This index, when calibrated with chlorophyll "a" concentration values measured with the classic spectrophotometric method for some neighbouring stations, allows practically continuing measurement of chlorophyll "a" concentration. The concentration is a weighted average for surface water (with light transmission to the depth at laser wavelength used as the weight).

  Fluorescence Profile Definition Parameters:

Index of sea-surface oil fluorescence: The index is calculated from the emitted spectra of fluorescence of sea-water and Raman bands measured with the lidar system which are used also for chlorophyll concentration studies. The value of the index is a weighted average for surface water (with light transmission to the depth at laser wavelength used as the weight). By dividing the fluorescence spectrum into bands of the fluorescent substance and backscattered water Raman one obtains the fluorescent coefficient of the oil (fluorescent substance). This expression mainly depends on the oil (fluorescent substance) concentration and is independent on many parameters as: laser power, distance from the object and sensor efficiency coefficients which are the same for both of bands. In this way we can determine the fluorescent coefficient of the oil which is the measure of the oil concentration.

  Fluorescence Index Definition Parameters:

The equipment:

Lidar System FLS-12 uses excimer laser ELI-130 to pump a dye laser DL_LIDAR as the light source, a 280 mm telescope with a polychromator and two receiver cameras (A and B) as the receiver. The parameters of the optical system are:

- beam divergence 5 mrad for the excimer laser and 1 mrad for the dye one
- excimer laser wavelength: 308 nm
- dye laser wavelength: tuned in range: 320-670 nm
- half-width of the dye laser impulse 0.1 nm
- impulse frequency 1-10 Hz,
- impulse duration 15 ns,
- impulse energy 70 mJ for the excimer laser and 3 mJ for the dye one.
The main part of the receiver block of the lidar system consists of a telescope of 280 mm radius and 635 mm focus distance and working distance range of 30-2000 m. The return signal passes through a polychromator with a spectral range of 425-800 nm. The lidar system is controlled by a PC unit which receives and stores the distance or spectral profiles measured.

The lidar system has two receiver blocks:

FLS-12 Lidar
Lidar FLS-12

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Written by Jacek Piskozub <piskozub@iopan.gda.pl> , Last updated April 22, 2002