A methodology for correct measurements of the spatial and energy characteristics of a laser beam is considered, based on the determination of the initial moments of the spatial intensity distribution in the beam cross section. The classification of radiation fields participating in the measuring process is given: emitted, measured and measured. It is shown that ISO 11146:2005 “Lasers and laser-related equipment. Test methods for laser beam widths, divergence angles and beam propagation ratios, Part 1-3” for measuring the spatial and energy characteristics of laser beams leads to incorrect measurements. This is due to the fact that the recommendations for the application of ISO 11146:2005 do not take into account the dynamic range of the used matrix radiation detectors, and the characteristics of the emitted field of interest to the user turn out to be diverging, which violates the uniformity of measurements. Moreover, the conditions ensuring the convergence of the results are practically impracticable. To solve these problems, it is proposed to establish and regulate the lower level of the dynamic range of measurements of the intensity of the used matrix receivers and to consider the spatial and energy characteristics of the emitted field of interest to the user, depending on the set value of the lower level. It is shown that measurements with this methodology become correct and make it possible to compare the characteristics of laser beams obtained by different array detectors. Formulas are given that take into account the effect of the lower level of the dynamic range of the matrix radiation detectors on the measurement result. These formulas should be recommended for inclusion in the updated edition of the national standard GOST R ISO 11146-2008 “Lasers and laser installations (systems). Methods for measuring widths, divergence angles and propagation coefficients of laser beams. Parts 1-3”.

The article is devoted to the improvement of the method of calibration of a coaxial-stripline test fixture. Its improvement ensures the transfer of the measurement planes of the S-parameters of the microwave active components, for example transistors, from the coaxial measuring path of the analyzer to the micro-strip line, what is important for designing microstrip devices for various purposes based on the measured S-parameters.

A through transmission impact method for measuring the sound velocity in the concrete cubic samples, which are used for determination of the concrete durability, is proposed. It is shown that for elimination of the surface wave influence on the measurement accuracy of the compact cubic sample resonant frequency the impactor and the receiving transducer should be placed on the opposite sides of the cube. Besides in some cases must be used multichannel through transmission impact method.

The problem of limited practical application of methods and devices for automatic control of the moisture content of products of the agro-industrial complex has been studied. Determination of moisture content of products of the agro-industrial complex by thermogravimetric method is considered. The efficiency of weighing and sampling by accelerated and arbitration methods is analyzed. The errors in determining the moisture content of products by the thermogravimetric method are estimated. It was found that the error of the accelerated method is several times higher than the error of the arbitration method. The need to improve the existing thermogravimetric method for determining moisture content, both in terms of rapidity and accuracy, is noted. The importance of choosing the optimal number of determined parameters of the research object, which ensures the maximum measurement accuracy, is shown. Based on the analysis and assessment of the accuracy of the thermogravimetric method for measuring humidity, the main requirements for the design of humidity control devices are formulated.