We have experimentally studied the laser-induced spectra of petroleum products at the excitation fluorescence wavelength of 266 nm. The paper depicts a schematic diagram of the laboratory setup, gives data resulted from processing of laser-induced fluorescence spectra, and shows that, in comparison with spectra of petroleum products, the laser-induced fluorescence spectra of oil have a shift toward the longer wavelength spectral region and a far wider spectral bandwidth. For oil, an efficient band of sensing fluorescence radiation, is of ~ 390 – 600 nm in average. For gasoline, an efficient band of sensing fluorescence radiation has a significant shift toward the shorter wavelength region (~ 320 – 360 nm) as compared to the efficient sensing fluorescence radiation band for diesel and engine oils (~ 330-395 nm).

No abstract

No abstract

Detection bands of the laser fluorosensor to detect oil pipeline leaks have been studied at the fluorescence excitation wavelength 355 nm. It is shown that a diversity of the fluorescence spectra of different oils and plant species leads to the need to adapt the number and position of spectral detection bands of the laser fluorosensor for the specific types of the pipeline oil and vegetation along the pipe way. With no interfering factors (that emerge false alarms) to monitor along the pipe way, only one spectral channel (at maximum position of the oil fluorescence spectrum) can be used. However, there can be a need to use both the two spectral channels (the channel 1 at maximum position of the oil fluorescence spectrum, and the channel 2 at maximum position of the vegetation fluorescence spectrum within ∼ 680…690 nm or ∼ 730…740 nm) and the tree spectral channels (the channel 1 at maximum position of the oil fluorescence spectrum, the channel 2 at maximum position of the vegetation fluorescence spectrum within ∼680…690 nm or ∼ 730…740 nm, and the channel 3 in the spectral band of 625-650 nm).

The paper depicts the experimental studies of laser-induced fluorescence spectra of natural objects on the ground surface using an eye-safe fluorescence-exciting wavelength of 355 nm. Shows that a value of the laser-induced fluorescence signal from natural objects can be comparable with the laser-induced fluorescence signal value from pollution on the ground surface. A development of laser-induced fluorescence methods to detect pollution at the eye-safe fluorescence-exciting wavelength of 355 nm holds promise. These methods rely on the analysis of the fluorescence spectra shape of pollution and natural objects on the ground surface.