Calibration of LIF data by Total Spectral Signatures in environmental applications

Sergey Babichenko, Larisa Poryvkina, Irina Jakovleva
AS Laser Diagnostic Instruments, 113A Kadaka str. 12915 Tallinn, ESTONIA,
larisa@ldi.ee

ABSTRACT

The combined use of LIF data produced by laser remote sensing and near-real time analysis of flight-path ground samples constitutes an essential element of multi-tiered environmental monitoring. The samples are typically taken at the spots corresponding to potential pollution sources or at the spots where LIF data demonstrate considerable variations in along-flight profile. Such variations are typically caused by a change of the status of water environment, and therefore LIF data require recalibration. Ground sample analysis on site can be effectively done by Spectral Fluorescent Signature (SFS) technique. Such a combination proved to be valuable for fast screening of wide territories in field studies with FLS lidar and Fluo-Imager analyser realising SFS technique.

One of important environmental applications – oil pollution detection – requires pollution volume estimation, because the corresponding measures depend on the pollution volume. Presence of aliphatic compounds in oil and variability of the ratio of aromatic and aliphatic components for different types of oils complicates quantification of oil pollution if the spilled oil product type is not known in advance. The method of Total Spectral Signatures (TSS) developed at LDI can help to overcome this obstacle. The TSS is treated as a linear combination of excitation, emission and absorption spectra in UV and VIS spectral ranges. This allows detection of aliphatic and aromatic compounds ratio, and therefore further quantification of unknown oil pollution volume. The method is realised by the Instant Screener analyser (LDI). The method and results of laboratory analyses are discussed.

Last Update: 2005-03-15