Experimental laboratory investigations of the laser-induced fluorescence spectra of watercress and lawn grass were conducted. The fluorescence spectra were excited by YAG:Nd laser emitting at 532 nm. It was established that the influence of stress caused by mechanical damage, overwatering, and soil pollution is manifested in changes of the spectra shapes. The mean values and confidence intervals for the ratio of two fluorescence maxima near 685 and 740 nm were estimated. It is presented that the fluorescence ratio could be considered a reliable characteristic of plant stress state.

Laser remote method of oil pollution detection on the rough sea surface is described. The method uses additional information about near-water wind and a special geometrical scheme for surface illumination. It is demonstrated that the offered method allows control of two effects independently and simultaneously: wind wave smoothing and changes of sea surface reflection coefficient. And consequently it allows decision making about oil contamination presence on the sea surface with a high reliability.

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