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This article describes a calculation procedure of a permissible leakage flow for sealed products. It is shown how a leak detector sensitivity can be improved by changing a pressure drop and a test gas. Optimal leak rate ranges for a mass spectrometric leak detector, a portable helium leak detector and a pressure decay leak detector are suggested in order to achieve high accuracy, repeatability and...
In this paper obtaining of hardening coatings formed by periodic deposition of thin layers of refractory compounds from plasma of vacuum-arc discharge is discussed. Studies have shown that the quality and structure of the formed multi-layer coating is determined by the initial layer of the material on the processed substrate, depending on the deposition conditions and primarily on the temperature...
Reproducibility of colorimetric measurements of light-emitting diodes is researched in case of application of digital Altering of a signal. Influence of methods of digital filtering of a signal on the quality of a received spectrum of radiation is shown. Results of researches of color characteristics of light-emitting diodes of the ceiling lamp are given. Distinctions in color coordinates for pairs...
The aim of this research is to study the gas permeability of materials being used to create elements of unmanned aerial vehicles. The measurement system for gas permeation coefficients of composite materials is designed on the basis of a helium leak detector. Due to permeation through the Viton sealing the smallest flow that can be correctly measured by the system is 10‐10 Pa · m3/s. Verification...
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