The description of designed in the Institute of Physics of NAS of Belarus the device for measurement of attenuation factors of laser radiation attenuators is adduced. The measurement procedure, and realization of calculations and representation of uncertainties of the results of a measurement on the device MAPLR is stated. The results of an attenuator factor calculation for the mechanical attenuator, which is included in a complete set of the laser radiation power and energy meter NM0 -2H and its uncertainty are adduced.
The appearance of elliptical polarization for linear polarized radiation reflected by plant leaves was investigated. The leaf cuticle reflectance model was proposed. The evaluation of refractive index and mean angle of cuticle roughness to leaf surface was carried out.
It was found that the radiation reflected by adaxial surface of leaf was elliptic polarization with maximum near Brewster. The ellipticity of reflected by leaves radiation increased with the increasing of mesophyll air spaces and the decreasing of leaf chlorophyll concentration. It can be explained that the non-polarized fraction of light from internal structure depends on the leaf pigments concentration and the quantity of air spaces in mesophyll.