The paper deals with the experimental studies of laser-induced fluorescence (LIF) spectra of plants under adverse development conditions at the eye-safe 355 nm wavelength of fluorescence excitation. It has been shown that in the spectral band of 670 - 750 nm a fluorescence spectra shape analysis makes it possible to detect vegetation under adverse development conditions. However, in the spectral band of 375 – 650 nm the resulting data do not give evidence of steady relationship between the fluorescence intensity and the plant conditions.
We have experimentally studied laser-induced fluorescence spectra of plants under man-made soil pollution at the fluorescence excitation wavelength of 355 nm. The paper describes a laboratory setup, presents measurement data of laser-induced fluorescence spectra of plants in the normal condition and under stress caused by man-made soil pollution and shows that the man-made soil pollution has a strong impact on the laser-induced fluorescence spectrum of plants.
We have experimentally studied laser-induced fluorescence spectra of petroleum products at the fluorescence excitation wavelength of 355 nm. The paper depicts a schematic diagram of the laboratory setup and gives data resulted from laserinduced fluorescence spectra processing of oil and petroleum products. A comparative analysis of laser-induced fluorescence spectra of oil and petroleum products has shown that laser-induced fluorescence spectra of oil have a shift toward the longer wavelength spectral region and that their spectral bandwidth is far wider. The paper presents the efficient bands to detect fluorescence emission of oil and petroleum products when exciting at the wavelength of 355 nm.
Laser induced fluorescence spectra of different types of petroleum products on various types of soils as well as natural and anthropogenic objects of underlying surface were measured for 355 nm excitation wavelength. Experimental setup was described. Results of fluorescence spectra processing were obtained. It was outlined, that fluorescence intensity of oil pollutions could have same value as fluorescence intensity of natural objects on underlying surface.
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