Parameters for the inclined-path sensing of molecular hydrogen in the atmosphere by lidar with a YAG:Nd laser

The lidar equation for the vibrational backscattering of neodymium laser radiation and its harmonics by hydrogen molecules is solved numerically. Inclined paths in the atmosphere are investigated with the aim of selecting the transmitter wavelength for detecting the lowest concentrations of hydrogen. Zh. Tekh. Fiz. 68, 20–22 (January 1998)     

Remote Sensing of Methanol Molecules in the Atmosphere by Raman Spectra

Optics and Spectroscopy - The lidar equation for Raman backscattering by methanol molecules is numerically solved for probing of molecules in the atmosphere with concentrations in the range of...     

Microhardness and refractive index of titanium dioxide-based binary coatings

Glass composites covered by sol–gel TiO₂–m Me _x O _y (Me _x O _y = ZnO, CdO, SnO, CuO, and Fe₂O₃ and m = 2, or 10 wt %) binary oxide coatings have been studied. The microhardness of the composites and glass substrate has been measured, and the microhardness of the coatings has been determined from these measurements. A correlation between the microhardness of the coatings, their refractive index, and packing density of disperse sol phase particles in the coating has been established.     

Temperature Field under Laser Ablative Destruction of Target at Low Temperatures

A thermal model of the laser ablative destruction of materials is considered. The method of moments is used to numerically solve nonstationary heat-conduction equation for 1D system. The solution makes it possible to analyze the dynamics of several parameters that characterize the laser ablation, in particular, surface temperature and characteristic thermal length.     

Optical properties of composites with nanodimensional oxide coatings versus the properties of film-forming sols. I. The influence of sol’s oxide composition

The influence of the aging period (duration) and the aging-related rheological characteristics of film-forming solutions (sols) on the refractive index and thickness of coatings, light reflection and light transmission coefficients, and optical losses in glass substrate-nanodimensional oxide (CuO-TiO₂) composites is considered. It has been shown that the increase in the CuO concentration in the coating and the extension of the sol aging period favor crystallization and change the form of inclusions in the coating from pseudospherical to dendritic with a different degree of branching. The refractive index of the film and its related coefficient of mirror reflection of the composite are functions of the density of packing sol disperse-phase particles into a nanodimensional layer. The packing density of dendritic particles drops decreases with the degree of their branching and transverse size of fragments. In every case, an optimal sol aging period should be found to obtain glass composites with nanodimensional coatings offering desired optical properties.     

The Sounding of Hydrogen Sulfide Molecules by the Raman Light Scattering Lidar Installed on a Flying Platform

Optics and Spectroscopy - The lidar equation is solved numerically for the Raman backscattering by hydrogen sulfide molecules in the atmosphere and water with concentrations about 1011–1015...     

Optimization of a semiconductor lidar for detecting atmospheric molecular iodine and hydrogen

A lidar equation for Raman backscattering of semiconductor laser radiation by I₂ and H₂ molecules is solved. The obtained results allow laser wavelength optimization for probing atmospheric I₂ and H₂ molecules at a distance up to 2 km.     

Laser sounding of molecular iodine in the atmosphere

The lidar equation for the fluorescence of ¹²⁷I₂ molecules is numerically solved. All the radiation wavelengths of a copper vapor laser are considered with the aim of choosing the one that is the most appropriate for detection of the minimum possible concentration of iodine molecules when this laser is used as a radiation source of a fluorescence lidar.