Subjects -> INSTRUMENTS (Total: 63 journals)
 Showing 1 - 16 of 16 Journals sorted by number of followers International Journal of Remote Sensing       (Followers: 151) IEEE Sensors Journal       (Followers: 111) Remote Sensing of Environment       (Followers: 96) Journal of Applied Remote Sensing       (Followers: 88) Remote Sensing       (Followers: 57) Modern Instrumentation       (Followers: 57) International Journal of Remote Sensing Applications       (Followers: 49) International Journal of Instrumentation Science       (Followers: 41) Experimental Astronomy       (Followers: 39) Measurement and Control       (Followers: 36) Photogrammetric Engineering & Remote Sensing       (Followers: 33) Journal of Instrumentation       (Followers: 31) Remote Sensing Science       (Followers: 30) Applied Mechanics Reviews       (Followers: 27) Review of Scientific Instruments       (Followers: 20) European Journal of Remote Sensing       (Followers: 18) Flow Measurement and Instrumentation       (Followers: 15) Journal of Sensors and Sensor Systems       (Followers: 12) Transactions of the Institute of Measurement and Control       (Followers: 12) Remote Sensing Applications : Society and Environment       (Followers: 9) Videoscopy       (Followers: 9) International Journal of Applied Mechanics       (Followers: 8) Metrology and Measurement Systems       (Followers: 8) Science of Remote Sensing       (Followers: 7) Imaging & Microscopy       (Followers: 7) Instrumentation Science & Technology       (Followers: 7) Microscopy       (Followers: 7) International Journal of Metrology and Quality Engineering       (Followers: 6) Computational Visual Media       (Followers: 5) Measurement : Sensors       (Followers: 5) PFG : Journal of Photogrammetry, Remote Sensing and Geoinformation Science       (Followers: 5) Optoelectronics, Instrumentation and Data Processing       (Followers: 5) Journal of Astronomical Instrumentation       (Followers: 4) IEEE Sensors Letters       (Followers: 4) Sensors and Materials       (Followers: 4) Journal of Optical Technology       (Followers: 4) Journal of Medical Devices       (Followers: 4) Measurement Techniques       (Followers: 3) Sensors International       (Followers: 3) IJEIS (Indonesian Journal of Electronics and Instrumentation Systems)       (Followers: 3) IEEE Journal on Miniaturization for Air and Space Systems       (Followers: 3) Solid State Nuclear Magnetic Resonance       (Followers: 3) Journal of Instrumentation Technology & Innovations       (Followers: 2) International Journal of Sensor Networks       (Followers: 2) Geoscientific Instrumentation, Methods and Data Systems       (Followers: 2) International Journal of Testing       (Followers: 1) Medical Devices & Sensors       (Followers: 1) Invention Disclosure       (Followers: 1) Journal of Research of NIST       (Followers: 1) Geoscientific Instrumentation, Methods and Data Systems Discussions       (Followers: 1) International Journal of Measurement Technologies and Instrumentation Engineering       (Followers: 1) Journal of Medical Signals and Sensors       (Followers: 1) Instruments and Experimental Techniques       (Followers: 1) Journal of Vacuum Science & Technology B       (Followers: 1) Metrology and Instruments / Метрологія та прилади Measurement Instruments for the Social Sciences Труды СПИИРАН Standards Jurnal Informatika Upgris InfoTekJar : Jurnal Nasional Informatika dan Teknologi Jaringan Devices and Methods of Measurements EPJ Techniques and Instrumentation Documenta & Instrumenta - Documenta et Instrumenta
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 Optoelectronics, Instrumentation and Data ProcessingJournal Prestige (SJR): 0.149 Number of Followers: 5      Hybrid journal (It can contain Open Access articles) ISSN (Print) 1934-7944 - ISSN (Online) 8756-6990 Published by Springer-Verlag  [2469 journals]
• Invariance of State Estimate for a Finite Markov Chain with Discrete Time

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Abstract: This study is devoted to solution of the problem of construction of the state estimate for a finite Markov chain with discrete time. The Markov chain is considered as a linear dynamic system with incomplete state information. The state estimate is constructed based on the Luenberger observer. The conditions of invariance of the state estimate to perturbations of transition probabilities in the Markov chain are obtained. A numerical example is considered.
PubDate: 2021-12-01

• Application of Coherent Lattice Filters in Goniometry

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Abstract: It is shown that the application of an ensemble of reading heads of a certain format coordinated with the parameters of a measuring raster and a matrix of indicator rasters of reading heads makes it possible to significantly reduce the distorting effect of the systematic component of the instrumental error of the raster. It is noted that the specific technical solution considered in this work for matching the parameters of complementary lattice filters is not the only one for the used raster.
PubDate: 2021-12-01

• Algorithm of Solving a Multiobjective Optimization Problem on the Basis of
a Kinetic Chemical Reaction Model

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Abstract: A numerical algorithm for determining the optimal regime parameters of a chemical process is developed. The problem of the multiobjective optimization of chemical process conditions is formulated in a general form. To solve the formulated problem, a genetic algorithm based on the FFGA method resulting in a set of Pareto-optimal solutions is given. Numerical experiment is performed for the thiol aminomethylation reaction to determine the optimal reaction time and temperature, which provide a maximum selectivity to the target reaction products.
PubDate: 2021-12-01

• Calculation of Permissible Errors of the 3D-Scanner Channels When
Measuring the Surface Shape of the Millimetron Observatory Mirror System
in the Orbital Operation Mode

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Abstract: On the basis of the previously developed mathematical model and operation algorithms of the mirror control system of the Millimetron Observatory, the results are presented of the numerical modeling for obtaining permissible values of the onboard 3D-Scanner errors during the preliminary measurement of the geometric parameters of the spatial configuration of the Millimetron observatory mirror system using optical reference marks on the surface of the mirror system. When modeling the measurement of the geometric parameters of the spatial configuration of the reference marks, two options of their implementation on the panels of the main mirror of the telescope are considered: option 1, the reference marks are given in the form of mirror spheres with a diameter of 10 mm located at four corners of the panels of the main mirror; option 2, reference marks from option 1 are supplemented by miniature rotating mirrors. The miniature mirrors make it possible to turn the measuring beam so that through the mirror it is possible to measure the geometric parameters of the reference marks located on the adjacent (for mirrors) panels of the main mirror. It is found that if the permissible values of the operation errors of the 3D-Scanner (9 $$\mu$$ m for the rangefinder channel and 2 arcsec for angle channels) are reached, and combined reference marks (option 2) are used, it is potentially possible to build a device for the preliminary alignment of the mirror system.
PubDate: 2021-12-01

• Edge Detection in Hyperspectral Images

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Abstract: Main approaches to object edge detection in hyperspectral images are considered. Algorithms are presented for the edge detection in spectral–selective objects based on spatial–spectral correlation and interspectral difference of gradients. The proposed algorithms are shown to be efficient in the processing of real hyperspectral images with additive Gaussian noise.
PubDate: 2021-12-01

• Development of a Digital Model of Mining Face of Coal Mine

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Abstract: The structure and the digital model of the mining face of coal mine are presented. The digital model contains the parameters of the coal bed, the technical parameters of the used mining machinery, and the economical indicators. The digital model can be applied to support decision-making in increasing the productivity of the mining fact of the coal mine, to estimate the effect of use of new machines or technologies. An example is presented in which the digital model is applied to determine the dependence of the financial indicators of operation of mining face on the wall length and technological schemes of coal extraction.
PubDate: 2021-12-01

• Study of the Method for Verification of the Hypothesis on Independence of
Two-Dimensional Random Quantities Using a Nonparametric Classifier

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Abstract: The properties of the method for verification of the hypothesis on independence of random quantities based on the application of a nonparametric image recognition algorithm corresponding to the maximum likelihood criterion are studied. Estimation of distribution laws in classes is performed using initial statistical data in the assumption of independence and dependence of compared random quantities. In these conditions, estimates for image recognition error probabilities in classes are calculated. Their minimum value is used to make a decision on independence or dependence of random quantities. The proposed method avoids the problem of decomposition of the domain of random quantities into multidimensional intervals. The efficiency of the proposed method with complication of the dependence between random quantities and change of size of initial statistical data is studied via numerical experiments.
PubDate: 2021-12-01

• Measuring the Interatomic Distance in a Silicon Crystal Lattice Using an
Optical Scanning Interferometer

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Abstract: We study the influence of the characteristics of the optical system of an interferometer on the distribution of spectral power density of partially coherent light passing through the system. The results of measurements of the effective wavelength for a partially coherent light source installed in the interferometer are presented. It has been shown that the optical system of the interferometer distorts the light source spectrum, which leads to a systematic error in measurements. The use of atomically smooth surfaces as mirrors in reference and measuring arms of the interferometer made it possible to study the influence of the optical system of the interferometer on phase distortions. It has been found that optical system distortions lead to a systematic error in the topography measurement of more than 5 nm in height. The use of an atomically smooth surface as a reference measurement object makes it possible to significantly reduce this error (to 0.12 nm). The results of measurements of the echelon of atomic steps with a countable number of monatomic layers on the silicon crystal surface are presented. For the first time, experimental methods of low-coherence optical interferometry were used to measure the average value of the interatomic (interplanar) distance in a [111] orientation Si crystal lattice, which was $$3.145\pm 0.003$$ Å.
PubDate: 2021-12-01

• Tools for Diagnostics and Assessment of Remaining Lifetime of Friction
Units at Operation of Gas Turbine Engines

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Abstract: The article presents the approach to constructing the tools for diagnosing dangerous states of gas turbine engines caused by destruction of bearing assemblies of power units. The approach is based on continuous monitoring of external factors acting on a bearing and inspection of the presence of metal particles in the engine oil system, which are carried out by means of original eddy current sensors, simulation of the bearing wear, and assessment of its remaining lifetime under varying operation conditions. This allows online determining the remaining life of the bearing assembly and predicting the time until its destruction, which, in its turn, provides the opportunity to prevent development of emergency situations.
PubDate: 2021-12-01

• Implementation of a Wavefront-Sensing Algorithm with Two-Channel Moiré
Deflectometry and Matlab Graphic User Interface

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Abstract: Experimental setups of two-channel wavefront sensor (WFS) based on moiré deflectometry have been proposed and developed in recent years. Capabilities of this WFS have been tested in the atmospheric turbulence measurements. Like other WFSs, it can be used in various areas. Therefore, we have developed a MATLAB graphical user interface program to allow any user to easily use it. This program takes simultaneous horizontal and vertical moiré patterns as input data and reconstructs corresponding wavefront map and its aberration values. Algorithm of the process is explained step by step in this paper. For a typical input moiré pattern the results such as wavefront shape and corresponding first ten Zernike coefficients are calculated and are shown as outputs of the software. In addition, there is a special part in the program for the atmospheric turbulence applications that calculates strength amount of the turbulence, $$C^{2}_{n}$$ , and temporal evolution of the angle of arrival.
PubDate: 2021-12-01

• Thin-Layer Holographic Photopolymer Materials with High Refractive Index
Modulation

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Abstract: Modified holographic photopolymer materials, which were developed in the Vorozhtsov Novosibirsk Institute of Organic Chemistry and provide high diffraction efficiency (DE) at a small recording layer thickness as a result of posttreatment, were studied by recording the reflection and transmission volume elementary holograms. Some samples of volume reflection holograms with DE of $$90{\%}$$ were obtained at a recording layer thickness of nearly 10 $$\mu$$ m and the refractive index modulation $$\Delta n$$ of no less than 0.036. The obtained holograms had high transparency throughout the entire visible spectral region, small shrinkage, and good uniformity in the spatial grating structure as evidenced by the sharp graphic of side lobes in the spectral response contour.
PubDate: 2021-12-01

• Selection of Singular Points Stable to Blurring and Geometric Distortions
of Images

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Abstract: The method for selecting the stable singular points of images obtained with BRISK and AKAZE algorithms is proposed. The method is based on separation of points preserved on the image after its considerable distortion. The results of numerical experiments on the basis of 1000 images are given confirming the efficiency of the proposed method. It is established that the sets of points obtained with the proposed method contain 3–5 times more stable points than random sets of the same size. It is shown that, for selecting the stable points, it is more efficient to use considerable distortions of images.
PubDate: 2021-12-01

• Control of the Regimes and Parameters of Lasing in Mode-Locked Fiber
Lasers: Opportunities and Prospects

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Abstract: A unique variability of modern fiber and integrated optics as well as the development of physics of complex nonlinear optical phenomena and nanophotonics have contributed to the development of qualitatively new approaches to the implementation and control of pulsed lasing in fiber lasers in the last decade. This article provides a structured review and comparative analysis of current methods for static and dynamic control of the regimes and parameters of lasing in mode-locked fiber lasers.
PubDate: 2021-12-01

• Isotropic Bessel–Hilbert Visualization of Phase Optical Density
Fields

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Abstract: The method and possibility of implementation of isotropic Bessel–Hilbert diagnostics of phase optical density fields of gaseous, condensed, and reactive media are discussed. The probing field in such systems is formed as a mono- or polychromatic configuration of Bessel beams the spatial-frequency Fourier spectrum of which is optically conjugate with the concentric phase structure of an isotropic Hilbert filter, and the color structure corresponds to spectral sensitivity of the photomatrix of the video camera connected to a computer which analyzes the frame-by-frame sequence of the obtained images. The structure of such a probing field is resistant to diffraction perturbations induced by the medium under study and their influence on isotropy of the Hilbert visualization of the phase optical density. The areas of possible applications are experimental fluid and gas dynamics, thermophysics, oceanology, and the corresponding industrial technologies.
PubDate: 2021-12-01

• Nonlinear-Optical Properties of
Polyfluorotriphenylpyrazoline-Dicyanoisophorone Dyes in a Polycarbonate
Matrix

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Abstract: Results of experimental works on studying concentration dependences and temporal and thermal stability of the quadratic response of guest–host materials based on polycarbonate and original synthesized dyes are presented. It is shown that chromophore modifications by dendron lateral substituents significantly improve solubility, which allows one to create materials with a high content of optically active particles. The materials possess high temporal and thermal stability and exhibit $$d_{33}$$ of up to 80 pm/V at a chromophore density of $$2{.}5\times 10^{20}$$ cm $${}^{-3}$$ .
PubDate: 2021-12-01

• Photoemission Properties of a Multialkali Photocathode

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Abstract: The feasibility of studies on the photoemission properties of multialkali photocathodes (MPs) in vacuum photodiodes with two semiconductor electrodes was demonstrated. The photoluminescence and quantum yield spectra were studied, and the high-resolution energy distribution curves of photoelectrons emitted from the MP were taken for the first time. Measurements were performed on multialkali photocathodes illuminated with monochromatic light within a wavelength range of 400–950 nm in a temperature range of 90–300 K. Based on the obtained data, the conclusion, that the MP is a negative electron affinity photocathode, was made. The properties of the solar element based on the studied vacuum photodiode were investigated.
PubDate: 2021-09-01
DOI: 10.3103/S8756699021050149

• Photoluminescence of Multiple GaN/AlN Quantum Wells

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Abstract: Photoluminescence of the structures with multiple GaN/AlN quantum wells grown by molecular beam epitaxy has been investigated. The calculated dependence of the energy of the quantum well photoluminescence band peak on the GaN layer thickness has been compared with the experimental data for various ratios of the thickness of the GaN and AlN layers. The thicknesses of the GaN and AlN layers were determined by transmission electron microscopy. The calculations of the photoluminescence band peak energy were carried out in the 6-band kp-approximation with consideration of spontaneous and piezoelectric polarizations. According to the calculation results, the slope of the dependence of the emission energy on the GaN layer thickness decreases as the ratio of the GaN layer thickness to the AlN layer thickness increases in accordance with the decrease in the electric field in the GaN layer. In quantum wells of sufficiently large thickness, the observed photoluminescence band peak energy is higher than the calculation result for undoped structures due to unintentional doping of the quantum wells, which leads to screening of the built-in electric field.
PubDate: 2021-09-01
DOI: 10.3103/S8756699021050022

• Microcavity for Single Quantum Dot Based Emitters

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Abstract: The design of microcavity for single quantum dot based emitters is developed. The microcavity consists of semiconductor distributed Bragg reflector and microlens fabricated by selective oxidation of gradient Al $${}_{x}$$ Ga $${}_{1-x}$$ As layer. The microcavity design provides a high external quantum efficiency of radiation extraction (up to 70 $$\%$$ ) and a high efficiency of radiation input into an optical fiber. The microcavity can be used to create emitters of single photons and emitters of entangled photon pairs based on single semiconductor quantum dots.
PubDate: 2021-09-01
DOI: 10.3103/S8756699021050034

• Scientific Heritage of S. V. Bogdanov

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Abstract: This article is dedicated to the famous physicist, founder of the school of acoustoelectronics and acoustooptics, Corresponding Member of the Russian Academy of Sciences Sergei Vasilievich Bogdanov in connection with the centenary of his birth (02.08.1921–14.02.2017)
PubDate: 2021-09-01
DOI: 10.3103/S8756699021050083

• Fundamentals of Ultra-High Dimensional Mosaic Focal Plane Array Creation
(Conceptual Review)

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Abstract: A prototype of the mosaic technology with a reduced size of ‘‘blind zones’’ is created based on the fundamental research of the basics of development of ultra-high dimensional mosaic focal plane arrays (MFPAs). At the same time, the areas of damage to the edges of chips when separating the wafers are minimal, and the gaps between the chips of adjacent submodules are no more than 2–3 $$\mu$$ m for different basic materials. The parameters of infrared MFPAs are investigated depending on the wavelength of the maximum spectral response of photosensitivity of multilayer structures with quantum wells, the pitch of photosensitive elements, and the format of submodules. In a number of proposed technological variants of prototypes, the MFPA blind zones optically overlap and the maximum (100 $$\%$$ ) efficiency of image conversion is provided. The mosaic technology is one of the fundamental principles for developing MFPAs of ultra-high dimension with maximum image conversion efficiency.
PubDate: 2021-09-01
DOI: 10.3103/S8756699021050095

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