There are general technical requirements for all types of reactors for chemical vapour deposition technology using AIII- BV metalorganic compounds. Among them, it is worth highlighting the large temperature gradients that cause the origin of convection loops, which in turn, taking into account the high speed of the gas flow, lead to turbulence in the reactor instead of the...
This article is devoted to research of the possibilities of automated design of fast and high-quality multi-lens objectives intended for use in night vision devices with modern image intensifier tubes of generation 4 and 4+, which have photocathodes with a diameter of up to 18 mm. Such image intensifier tubes are characterized by extended spectral sensitivity, high signal-to...
Thermally induced error is one of the main limitations of the sensitivity of fiber-optic gyroscopes (FOGs). The analysis of thermal sensitivity of FOG is based on the study of the Shupe effect and the elastic-optical effect in the fiber circuit. The main requirement in this case is to preserve the principle of reciprocity for rays propagating in opposite directions of the fiber...
Today, the world's leading countries are intensively working on the development of new generation radars - microwave photonic radars. Microwave photonic radars make it possible to significantly reduce the mass and size characteristics of radar stations, to increase the information capability and range of target detection due to the reduction of losses in long communication lines...
An urgent problem of modern diagnostic methods of medicine is the development of non-invasive methods that use information signal processing systems from the biological object of research. An expedient technical solution to such problems is the use of artificial intelligence in systems and complexes that combine diagnostic functions based on the parameters of the patient's...
The processes of assessment and control of the penetration of drugs into biological tissues under the influence of a magnetic field are investigated and systematically analysed.The aim of the work is to improve the methods for assessing magnetic field penetration and to develop new automated systems for optimising the penetration of drugs into tissues. The paper presents a...
Introduction. In practical dentistry, a significant number of various materials are used - for filling teeth, for implant restorative surgery, as well as materials for prosthetics. In this case, metals, dielectrics and their combinations are used. The article is devoted to the results of the study of electromagnetic properties of a group of dental materials - fixing cements...
Modeling thermal gradients in biological tissues, when interacting with laser radiation, helps to understand how heat flows are distributed in the body and reflect heating zones. The main aspects of the simulation include the parameters of the laser source, such as the wavelength and power, the initial temperature conditions of the tissues, as well as the use of special numerical...
During long-term observation of the operation of the ventilator (artificial lung ventilation) of the UVENT-T model, a violation of repeatability was noticed under the same operating conditions. That is, on some devices of this particular model, the air flow sensor under the same conditions showed different values when repeating the measurements.Through experiments, it was...
Study of the influence of the controlled parameters of the electron beam (the density of the thermal effect Fn and the speed of movement (scanning) along the treated surface V) on such important parameters of the quality of the end surfaces of the light guides as their cleanliness and micro-roughness, which have a significant impact on the transmission coefficient of IR radiation...
The article presents a technique and formula for calculating the thermal diffusivity of solids using nomograms of temperature changes. The paper describes a technique by which the final formulas are simplified to algebraic equations using the relative temperature θM of heating a semi-restricted rod from the end.Known equations for solving direct problems of heat conduction using...
Gas pipeline networks are complex distributed systems consisting of hundreds of kilometers of pipelines of various configurations. Equipping all sections of the gas pipelines with gas accounting and gas parameter metering devices that would allow for the quick detection of pipeline damages and the determination of gas loss volumes requires significant funds. As a result, many...
Improvement in the technology of growing multicomponent semiconductors and the study of their potential applications contribute to the development of semiconductor devices with improved characteristics. Aluminum gallium arsenide is a promising three-component semiconductor in terms of crystal lattice matching, which caused a comprehensive study of the material in order to create...
Problem. Photosensitive sensors are widely used both in everyday life in climate systems and in communication devices and street lighting. In order to improve the performance parameters of photosensitive sensors, the use of silicon nanowires (SiNWs) has been proposed. A large number of articles are dedicated to the influence of synthesis parameters on the dimensions of SiNWs...
Automated eddy current non-destructive testing has an important role in the quality inspection system for products made of conductive materials both at the production stage and during their operation. The appearance of novel alloys, the complexity of product geometry and inspection conditions, and the increased requirements for the reliability and accuracy of inspection results...
The problem addressed in this research is the parametric synthesis of zoom-afocal optical systems for transfocusors used in measurement technology, specifically thread-type rangefinders. The research aims to develop a universal analytical algorithm that can be computerized for calculating the optical and dimensional parameters of four-component zoom-afocal lens systems for trans...
Camera calibration is a critical method for 3D measurement applications based on 2D images. During calibration, internal camera parameters such as principal point and focal length are determined. The principal point is the intersection of the camera's optical axis and the image plane, while the focal length is measured from the lens center to the principal point.This article...
The article is devoted to the research of existing and the development of new computer models of the hemispherical and normal spectral coefficient of emission of optical incandescent lamps. Optical lamps (filament electric lamp, FEL) remain a prevalent source of radiation in various optoelectronic systems today. They provide radiation in the ultraviolet, visible, near-infrared...
This study presents the results of an automated parametric synthesis of a series of orthoscopic aspheric optical systems of mirror telescopes with different focal lengths, built according to the Korsch scheme. In order to ensure compactness of the design, these systems consist of three second-order aspheric mirrors and three folded flat mirrors. The obtained optical systems have...
Calibration of the inertial measuring unit (IMU) is an independent task and is the most important stage in preparing for operation both platform and strapdown inertial navigation systems (INS). The traditional calibration of IMU, containing at least three gyroscopes and three accelerometers, carried out in specialized testing laboratories, has been studied in sufficient detail...
Modern medicine widely uses mechatronic modules in systems of various purposes, such as automated systems of diagnostics, scanning, irradiation. Recently, mechatronic modules in robotic surgical complexes are gaining importance. Thus, with the use of integrated sensors in mechatronic modules, executive manipulators of automated systems, positioning accuracy in defined spatial...
One of the main problems in the gas supply industry remains the insufficient accuracy in determining the volumes of consumed gas. On the one hand, this is due to the use of faulty or outdated measuring equipment in metering stations, and on the other hand, the operating conditions of metering stations do not always meet the requirements of technical documentation. In particular...
The article presents the results of a study of the homogeneity of rectangular optical radiation fluxes for different versions of the initial sections of the light guide nozzles. When conducting a significant part of laser exposure in medicine, pathological areas of biological tissue or their projections located on the surface of the body are covered with light spots with contours...
The development of modern tools and methods of artificial intelligent provides a wide range of functionality for various scientific and applied tasks, and also allows obtaining new results. A question arises about how to apply elements of artificial intelligence to obtain new combinations and connections obtained by generation. As a purpose of the article is considered applying a...
Simulators of environmental state sensors are used to set up and control the efficiency of automatic process control systems. In some cases, it is convenient to use a voltage-resistance converter with an optoelectronic output module based on a controlled photoresistor as a simulator of potentiometric sensors. An optical-electronic voltage-to-resistance converter, which has a...