Subjects -> INSTRUMENTS (Total: 62 journals)
 Showing 1 - 16 of 16 Journals sorted alphabetically Annali dell'Istituto e Museo di storia della scienza di Firenze Applied Mechanics Reviews       (Followers: 27) Bulletin of Social Informatics Theory and Application       (Followers: 1) Computational Visual Media       (Followers: 4) Devices and Methods of Measurements Documenta & Instrumenta - Documenta et Instrumenta EPJ Techniques and Instrumentation European Journal of Remote Sensing       (Followers: 9) Experimental Astronomy       (Followers: 39) Flow Measurement and Instrumentation       (Followers: 18) Geoscientific Instrumentation, Methods and Data Systems       (Followers: 4) Geoscientific Instrumentation, Methods and Data Systems Discussions       (Followers: 1) IEEE Journal on Miniaturization for Air and Space Systems       (Followers: 2) IEEE Sensors Journal       (Followers: 103) IEEE Sensors Letters       (Followers: 3) IJEIS (Indonesian Journal of Electronics and Instrumentation Systems)       (Followers: 3) Imaging & Microscopy       (Followers: 9) InfoTekJar : Jurnal Nasional Informatika dan Teknologi Jaringan Instrumentation Science & Technology       (Followers: 7) Instruments and Experimental Techniques       (Followers: 1) International Journal of Applied Mechanics       (Followers: 7) International Journal of Instrumentation Science       (Followers: 40) International Journal of Measurement Technologies and Instrumentation Engineering       (Followers: 2) International Journal of Metrology and Quality Engineering       (Followers: 4) International Journal of Remote Sensing       (Followers: 274) International Journal of Remote Sensing Applications       (Followers: 43) International Journal of Sensor Networks       (Followers: 4) International Journal of Testing       (Followers: 1) Journal of Applied Remote Sensing       (Followers: 83) Journal of Astronomical Instrumentation       (Followers: 3) Journal of Instrumentation       (Followers: 32) Journal of Instrumentation Technology & Innovations       (Followers: 1) Journal of Medical Devices       (Followers: 5) Journal of Medical Signals and Sensors       (Followers: 3) Journal of Optical Technology       (Followers: 5) Journal of Sensors and Sensor Systems       (Followers: 11) Journal of Vacuum Science & Technology B       (Followers: 2) Jurnal Informatika Upgris Measurement : Sensors       (Followers: 3) Measurement and Control       (Followers: 36) Measurement Instruments for the Social Sciences Measurement Science and Technology       (Followers: 7) Measurement Techniques       (Followers: 3) Medical Devices & Sensors Medical Instrumentation Metrology and Measurement Systems       (Followers: 6) Microscopy       (Followers: 8) Modern Instrumentation       (Followers: 50) Optoelectronics, Instrumentation and Data Processing       (Followers: 4) PFG : Journal of Photogrammetry, Remote Sensing and Geoinformation Science Photogrammetric Engineering & Remote Sensing       (Followers: 29) Remote Sensing       (Followers: 54) Remote Sensing Applications : Society and Environment       (Followers: 8) Remote Sensing of Environment       (Followers: 93) Remote Sensing Science       (Followers: 24) Review of Scientific Instruments       (Followers: 22) Sensors and Materials       (Followers: 2) Solid State Nuclear Magnetic Resonance       (Followers: 3) Standards Transactions of the Institute of Measurement and Control       (Followers: 13) Труды СПИИРАН
Similar Journals
 Optoelectronics, Instrumentation and Data ProcessingJournal Prestige (SJR): 0.149 Number of Followers: 4      Hybrid journal (It can contain Open Access articles) ISSN (Print) 1934-7944 - ISSN (Online) 8756-6990 Published by Springer-Verlag  [2626 journals]
• Fabrication of Thin-Film Axicons with Maximum Focal Lengths
• Abstract: The possibility of the fabrication of film axicons with large focal lengths is shown experimentally. The fabrication technology includes vacuum deposition of layers of chalcogenide glass of variable thickness, which varies linearly depending on the substrate radius. Axicons with focal lengths up to 15 m are obtained.
PubDate: 2020-07-01

• Identification of Molecular Bands in Plasma Radiation Spectra Inside a
Low-Emission Combustion Chamber
• Abstract: Molecular bands OH (306.1 nm), CH (430.18 nm), H $${}_{2}$$ O (714–980 nm), C $${}_{2}$$ (515.55 nm), NH (336 nm), NO (358.26 nm) have been identified (the most intense edges are shown in parentheses) in the plasma radiation spectra inside the low-emission combustion chamber of a gas turbine engine. This allows the ratio of their intensities to be used for controlling the working parameters of the combustion chamber to reduce emissions of harmful substances regulated by ICAO standards. The spectra have been recorded using Kolibri-2 spectrometers in two versions: (I) working spectral range of 190–1100 nm (with a resolution of 1 nm) and (II) working spectral range of 190–360 nm (with a resolution 0.2 nm). The radiation input into the spectrometer has been performed using a fiber-optic cable and a collimator.
PubDate: 2020-07-01

• Far Field Diffraction Phenomena on Cylindrical Objects of Small Diameter
Taking into Account Their Reflective Properties
• Abstract: The features of far field diffraction phenomena on cylindrical (metal) objects of small diameters (0.01–0.5 mm) are investigated taking into account their reflective properties within the framework of the Kirchhoff–Fresnel scalar theory of light diffraction. The calculations used a screen-type cylinder model (of zero thickness). The reflected far field component was calculated by the stationary phase approximation. It is shown that when using standard information processing algorithms (valid for screen-type objects), the effect of the reflected light wave leads to a noticeable measurement error proportional to the amplitude coefficient of light reflection from the cylinder surface. To reduce its influence, we propose an algorithm for determining the diameters of such objects with increased accuracy by appropriate processing of the diffraction pattern near the angles $$\theta\ll\sqrt[3]{\lambda/R}$$ , where $$\lambda$$ is the light wavelength and $$R$$ is the cylinder radius. The obtained results can be used in the development of high-precision diffraction meters for thin cylindrical objects (wires, filaments, fibers).
PubDate: 2020-07-01

• Light Section Method of Alignment Control for Weapon Barrels
• Abstract: Basing on the structural lighting method, we develop a contactless system of the alignment control for weapon barrels. We propose and design a construction of a compact optical sound using a diffraction optical element to expose the barrel bore. We provide processing algorithms for images obtained under the scanning of the barrel bore; then, using these algorithms, we restore the 3 $$D$$ -shape of the controlled item and compute the required geometric parameters. We provide test results of the alignment control system on samples of real products.
PubDate: 2020-07-01

• Overview of Integrated Optical Sensors Based on Silicon: Forecasts and
Results of the Decade [Invited Article]
• Abstract: Silicon photonics is the most important technological platform for creating a variety of functional optical elements, including promising types of optical sensors. Moreover, in recent years, 20% of all publications on silicon photonics are devoted to the development of various versions of optical sensors. Their advantage steams from the combination of high technical parameters with the possibility of mass production using CMOS technology of microelectronics and nanophotonics. A brief description of various technological solutions of the last decade that provide progress in the development of optical sensor characteristics is given. Special attention is paid to new promising sensor designs based on bimodal technology, which promises a significant increase in sensor sensitivity by means of equalizing the group delay of a pair of different optical modes propagating through the waveguide structure. The review will be useful for domestic and foreign researchers working in the field of sensor development.
PubDate: 2020-07-01

• Dynamics of Diffraction Efficiency of Superimposed Volume Reflection
Holograms at Their Simultaneous Recording in Photopolymer Material
• Abstract: The new experimental data on the dynamics of diffraction efficiency (DE) of superimposed volume reflection holograms with a grating period of $${\sim}$$ 250 nm is obtained at their simultaneous recording in the photopolymer material BAYFOL HX TP. The character and parameters of their interaction are established when exposure of one hologram is delayed relative to the other one. It is revealed that the DE dynamics is practically not affected by variations in diffusion time of monomer in the range $$0.12<t_{D}<0.17$$ s, but the transient behavior of the photopolymerization parameter $$\tau_{p}$$ , which increased in our experiments from 5 to 15 s, becomes considerably visible. The well-known equations of the photoinduced variation in the photopolymer refraction index are improved with account for the character of variation in the parameter $$\tau_{p}$$ . The calculated dependences of DE dynamics obtained with refined formulas are in good agreement with experimental data (mean square deviation is $${\sim}2\%$$ ).
PubDate: 2020-07-01

• Bichromatic Laser Doppler Velocity Vector Meter
• Abstract: The article considers the possibility of constructing laser Doppler velocity vector meters based on a bichromatic source of spatially combined Gaussian or Bessel beams, the two-wave single-channel Bragg acousto-optic modulator with a ratio of ultrasonic wave frequencies equal to the ratio of the wave numbers of diffracted laser beams. The spatial, chromatic, and frequency structure of the 3D coordinate-measuring basis formed from the Gaussian or Bessel beams by the same sequence of optical elements and the photoelectric conversion adequate to the structure of light scattered by the investigated medium provide the minimum hardware Doppler spectrum width and increased noise immunity.
PubDate: 2020-07-01

• Method of Contactless Measurement of Large Object Deformations Based on
Structured Illumination
• Abstract: The possibility of determining deformations of large-sized objects by structured illumination is considered. The method is based on projection of sinusoidal fringe patterns on the surface of the object under study. Using the step-by-step phase shift allows one to distinguish information about the phase distribution reflecting the surface relief. Comparison of phase distributions before and after the action on the object makes it possible to establish the deformation field. A new method of finding phase differences is presented; it considerably reduces demands to phase ambiguity elimination algorithms. An experimental facility for the determination of ultimate sensitivity of the method when investigating deformations of a clamped cantilever beam is developed. It is shown that the sensitivity of the method is less than 10 $$\mu$$ m at the free end of the beam.
PubDate: 2020-07-01

• A Method for Laser Heterodyne Tomography of Reflection Gratings
• Abstract: A method and physical and technical design of the laser heterodyne tomography of scattering properties of thick photosensitive materials (media) in the reflection mode are proposed. The method is based on the acoustooptic scanning of a test reflection grating recorded in the medium and on the layer-by-layer collinear heterodyne analysis of the scattered field. The formulas for estimating the spatial resolution capability of the method and the period of test grating are obtained, and the estimate of method’s sensitivity is given in the form of dependence of the heterodyne signal on the depth of grating layer positions. The theoretical conclusions of the work are confirmed experimentally.
PubDate: 2020-07-01

• Matched Filtering of Small-Sized Objects in Images Containing Constant
Spatial Interference
• Abstract: The influence of spatial inhomogeneity of the photoelectric characteristics of a matrix photodetector (PDD) on the quality of detection of small-sized objects in the image formed by it is considered. It is shown that in the conditions of spatially inhomogeneous natural noise of the PDD, the traditionally applied two-point correction is not optimal for subsequent matched image filtering performed in order to increase the reliability of object detection. A two-stage algorithm for constructing a linear spatially invariant matched filter is proposed, which provides a significant increase in the reliability of detecting weak small-sized objects against the background of uncorrelated noise in images containing interference due to the spatial heterogeneity of the PDD characteristics.
PubDate: 2020-07-01

• Single-Frequency Thulium Doped Fiber Laser with Distributed Feedback
• Abstract: A single-frequency all-fiber thulium doped laser with distributed feedback is presented. The fiber Bragg grating with a phase shift, which is the cavity of the laser, is written in a highly-doped 36-mm segment of the thulium-doped fiber. The highest power of the single-frequency generation on the wavelength of 1919 nm reaches up to 80 mW at the power of the pumping radiation of 1.1 W. The generation linewidth is equal to 70 kHz. Relative intensity noises of the optical radiation do not exceed the level of 70 dB/Hz with the maximum at the frequency of 1.2 MHz.
PubDate: 2020-07-01

• Quantum Computers Based on Cold Atoms $${}^{\mathbf{\#}}$$
• Abstract: A brief survey of present-day achievements in quantum informatics is presented. Advantages of quantum computers are shown by an example of simplest quantum algorithms. Application of ultracold atoms for the implementation of quantum processors is considered.
PubDate: 2020-07-01

• Control and Positioning System for Reflector of ‘‘Millimetron’’
Observatory: Design and Development
• Abstract: We propose a method to control the multi-element mirror system of the telescope of the space observatory ‘‘Millimetron’’ under its tuning taking place after the opening on the orbit. For the preliminary control of the location of reflector elements, the laser rangefinder is used; for the final control, the optical method of the Foucault knife is used. We compute the optical scheme of the control system for the final tuning of the telescope and present it. We show simulation results for images obtained under deviations of reflector elements. We present computation results for the optical system, implementing the Foucault knife method.
PubDate: 2020-07-01

• Selection of the Informative Feature System for Crops Classification Using
Hyperspectral Data
• Abstract: The methods based on processing video data have shown their efficiency in many areas of agriculture and forestry. Nevertheless, they are not enough accurate for classification of barely discernible objects and types of plants, which can be provided only using hyperspectral sensors. However, such devices by now were expensive and difficult in operation and were used mostly on satellites and manned aircraft. In recent years, the technologies for creating smaller and lighter sensors have been proposed; these technologies are based on the choice of restricted number of spectral intervals and their position at the design stage. They may be used for scientific or commercial goals under field conditions and, in addition, installed on unmanned aerial vehicles. Exemplified by a 220-channel hyperspectral image, this paper investigates the capability of significant reduction in the amount of registered data due to choice of position and width of restricted number of most informative spectral channels in solving the classification problem of agricultural plants. It is shown that the applied method for generating feature systems has a considerable advantage against the regular decimation and is close in its efficiency to the methods based on the analysis of principal components, but has a significantly less amount of needed computations.
PubDate: 2020-07-01

• Determining Poling Conditions of Chromophore–Polymer Films in the Field
of Corona Discharge by Measuring Signal of Generation of Second Harmonic
• Abstract: Using the experimental setup for poling film samples with capability of continuous monitoring of generation signal of second harmonic, the conditions of effective orientation of chromophore molecules based on polyfluoro-substituted triaryl pyrazoline and dicyan-substituted isophoron in micron films of polycarbonate are determined. The second harmonic is excited with the pulse Nd:YAG laser with 1064 nm when chromophore molecules are oriented in the field of corona discharge. The dependences of signal level of the second harmonic on the potential at field mesh and on the potential at needle electrode are measured.
PubDate: 2020-07-01

• Vertical Adjustment of Interferometer Beam in a Ballistic Gravimeter
• Abstract: A method for vertical adjustment of displacement control of measuring beam flare spot for absolute laser ballistic gravimeters is described. This method is based on video registration of displacement trajectory of the measuring beam reflected from the corner reflector during the free fall of a body. The values and directions of the measuring beam angle relative to the vertical were determined using frame-by-frame processing of the obtained videorecording. It is experimentally established that the error of vertical adjustment does not exceed $$3\times 10^{-5}$$ rad
PubDate: 2020-05-01

• Automated System for Studying Flow Structure in Multiring
Taylor–Couette Flow
• Abstract: The paper describes a test workbench and its automation for studying a heat generator based on the Taylor–Couette flow between independently rotating multi-cylinder rotors. The technique of analyzing the spectra of pulsations of the drag force torque induced by the rotation of the heat generator rotors was used to study the flow structure. We present the techniques for recording the generated heat power and studying the frequency characteristics of flow inhomogeneities in a fluid located in cylindrical clearance spaces with moving walls. The developed equipment and measurement techniques made it possible to obtain experimental data on the influence of the operating modes of the heat generator and the parameters of the working fluid on the process of generating thermal energy.
PubDate: 2020-05-01

• Algorithms and Architecture of the Multirotor Aircraft Trajectory Motion
Control System
• Abstract: A control algorithm based on the required differential equations of deviations is proposed to solve the problem of tracing the desired trajectory by target position. The flight path is planned on the basis of the author’s method of calculation of a flat trajectory consisting of oriented segments of straight lines connected by Euler spirals. The software and hardware complex of the automatic flight control system is presented. The operability of the control system in the presence of measurement noises and external disturbances is confirmed by the results of experiments to control the flight of a quadcopter indoors.
PubDate: 2020-05-01

• Regimes of Pulsed Generation in a $$\textrm{Nd}:\textrm{YAG}$$ -Laser with
Different Optical Circuits of Resonators
• Abstract: Some results of the study of different circuits implementing the simultaneous mode locking and Q-switching of a resonator with the use of a spherical mirror and a travelling-wave acoustooptical modulator (SMAOM method) in a $$\textrm{Nd}:\textrm{YAG}$$ laser are considered. The output time and energy characteristics are presented for a diode-pumped $$\textrm{Nd}:\textrm{YAG}$$ laser with SMAOM and powerful picosecond tunable $$\sim$$ 620-nm radiation resulting from the cascade conversion of the frequency of a superluminescent parametric generator with pumping by means of such a laser.
PubDate: 2020-05-01

• Measurement of Time Delay between Magnetic Diagnostic Coils in Tokamak
Using Cross-Spectral Analysis
• Abstract: Delay in detecting the position and boundaries of the plasma confined by a tokamak increases plasma instability and decreases the accuracy of plasma control in tokamak. In this article, two techniques called ‘‘periodogram’’ and ‘‘cross-spectral analysis’’ are used to provide a quantitative approach for computing the time delay between data received by two diversity coils from one source (plasma fluctuations) in IR-T1 tokamak. To analysis the achieved data after performing the Fourier transform on the data, the periodogram, square-coherency and spectrum phase diagram of the data were plotted in terms of frequency at three different time intervals. In the time interval, $$29000<t<3000$$ $$\mu$$ s, when the plasma current is almost constant, the average phase shift between the $$\omega$$ -frequencies components of the data was obtained by using the phase-spectrum analysis. At the frequency of the highest coherency the time delay ( $$\tau_{d}=1.831$$ $$\mu$$ s) between the data of the Rogowski and Mirnov coils was calculated by considering the average phase shift between them.
PubDate: 2020-05-01

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