Automatic Identification - Basis of Industry 4.0 Development The article is based on an analytical review of the basics of automatic identification, various technologies, advantages and capabilities, as well as the limitations of various systems. The paper focus is on visual identification, which still occupies the most important place on the market.
Study of High-Precision Analog-To-Digital Converter for Measuring Current-Output Accelerometer Signal This paper is devoted to the analysis of various types of analog-to-digital converters (ADCs) for the accelerometer channel of inertial navigation systems. The requirements for such ADCs are specified based on the operating modes of accelerometers. Different types of ADCs are considered and their inherent errors are analyzed. The most critical parameter is the change in the zero offset during cyclic action of high and low temperatures. It is shown that the use of a sigma-delta ADC with the possibility of periodically calibrating the zero offset is the most suitable for satisfaction of the formulated requirements to the ADC. The scheme and results of experimental studies of ADCs of this type are given. It is shown that the use of temperature-algorithmic correction makes it possible to reduce the change in the zero offset of the ADC by 18 times. The amplitude-frequency property (AFP) of such ADC for applications on dynamic objects is analyzed.
Characteristics of InGaAs/InP Single-Photon Avalanche Detectors by WOORIRO (Korea) The article presents the results of testing new single-photon avalanche photodetectors (SPAD) produced by Wooriro (Korea). Quantum efficiency, dark count rate, and afterpulsing probability were measured. A comparison of the detectors under study with the well-established Princeton Lightwave (USA) detectors allows us to conclude that Wooriro SPADs are applicable in quantum key distribution (QKD) systems.
Optical Properties of Li₂₋₂ₓMg₂₊ₓ (MoO₄)₃ Crystals Activated by Eu³⁺, Сu²⁺, Ti⁴⁺ Ions The paper presents the results of study of crystals Li₂₋₂ₓZn₂₊ₓ (MoO₄)₃, doped with europium, copper and titanium ions. The photoluminescence spectra are recorded and the photoluminescence lifetimes are calculated. It is shown that the doping of Li₂₋₂ₓZn₂₊ₓ (MoO₄)₃ crystals with europium, copper, and titanium ions leads to an increase in the luminescence intensity with a maximum at a wavelength near 520nm. For Li₂₋₂ₓZn₂₊ₓ (MoO₄)₃: Eu crystals, a photoluminescence spectrum due to europium transitions was recorded and the corresponding lifetimes were calculated to be 0.57 and 3.4ms. Based on the analysis of the angular dependences of the EPR spectra of Li₂₋₂ₓZn₂₊ₓ (MoO₄)₃: Cu crystals, it was established that copper ions enter the structure in the Сu²⁺ state and occupy the position of magnesium with the formation of an oxygen vacancy to provide charge compensation. The parameters of the EPR spectra of copper ions are calculated.
Optical Properties of AlN/ GaN Based Heterostructure Modern technology of forming heterostructures based on solid solutions of semiconductor nitrides, allows obtaining high-efficiency light-emitting diodes. Aluminum and gallium nitrides as well as solid solutions based on them are promising materials for optoelectronic devices in violet spectral region. Optical properties of a multilayer heterostructure based on wide-gap AlN / GaN semiconductors are studied. Modeling carried out using the mathematical software package MathCad. The results are of interest for industrial forming integrated structures emitting at several wavelengths. The creation of such a source allows you to increase the differential quantum efficiency of the LED in the UV region of the spectrum. Developed the structure of source with radiation wavelengths near 278 and 317 nm.
Method for Determining The Difference of Delays of Laser Radiation Pulse Propagation Trough Optical Fiber in The Time Scale Comparison & Synchronization Systems The influence of the properties of optical fiber on the propagation delays of signals transmitted by time scales comparison and synchronization systems (TSCSS) using fiber-optical communication lines is considered. The method of experimental define of difference propagation delay of signal from two lasers of TSCSS is proposed. The method can be used to define the corrections to measurement results of TSCSS devices for decrease of influence of chromatic dispersion. The results of experimental approbation of the proposed method are presented.
Fiber-Optic Transformers of Electric Current: Physical Principles & Technical Realizations. Part I Physical principles of an optical method for an electrical current measurement based on the Faraday effect are considered. Its application for a creation of fiber-optic transformers of electric current (FOTC) is discussed. The properties of a special fiber for a sensing element of up-to-date FOTC are analyzed. The description of FOTC technical realizations is presented.
Lensless On-Chip-Hemocytometry With Secondary Processing Of Cell Images in the Framework of an Unconventional Photometric Model In this work we propose a new lens-less imaging method for haemocytometry and blood analysis based on shadow projection and Lommel-Seeliger photometric model for analysis and volume visualization of red blood cells, including abnormal forms of cells using a mesofluidic chip. This system is tested on the blood sample of the conventionally healthy donor.