Subjects -> INSTRUMENTS (Total: 63 journals)
Showing 1 - 16 of 16 Journals sorted alphabetically
Applied Mechanics Reviews     Full-text available via subscription   (Followers: 27)
Computational Visual Media     Open Access   (Followers: 5)
Devices and Methods of Measurements     Open Access  
Documenta & Instrumenta - Documenta et Instrumenta     Open Access  
EPJ Techniques and Instrumentation     Open Access  
European Journal of Remote Sensing     Open Access   (Followers: 18)
Experimental Astronomy     Hybrid Journal   (Followers: 38)
Flow Measurement and Instrumentation     Hybrid Journal   (Followers: 15)
Geoscientific Instrumentation, Methods and Data Systems     Open Access   (Followers: 2)
Geoscientific Instrumentation, Methods and Data Systems Discussions     Open Access   (Followers: 1)
IEEE Journal on Miniaturization for Air and Space Systems     Hybrid Journal   (Followers: 2)
IEEE Sensors Journal     Hybrid Journal   (Followers: 107)
IEEE Sensors Letters     Hybrid Journal   (Followers: 4)
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems)     Open Access   (Followers: 3)
Imaging & Microscopy     Hybrid Journal   (Followers: 7)
InfoTekJar : Jurnal Nasional Informatika dan Teknologi Jaringan     Open Access  
Instrumentation Science & Technology     Hybrid Journal   (Followers: 7)
Instruments and Experimental Techniques     Hybrid Journal   (Followers: 1)
International Journal of Applied Mechanics     Hybrid Journal   (Followers: 8)
International Journal of Instrumentation Science     Open Access   (Followers: 41)
International Journal of Measurement Technologies and Instrumentation Engineering     Full-text available via subscription   (Followers: 1)
International Journal of Metrology and Quality Engineering     Full-text available via subscription   (Followers: 6)
International Journal of Remote Sensing     Hybrid Journal   (Followers: 144)
International Journal of Remote Sensing Applications     Open Access   (Followers: 49)
International Journal of Sensor Networks     Hybrid Journal   (Followers: 2)
International Journal of Testing     Hybrid Journal   (Followers: 1)
Invention Disclosure     Open Access   (Followers: 1)
Journal of Astronomical Instrumentation     Open Access   (Followers: 3)
Journal of Instrumentation     Hybrid Journal   (Followers: 31)
Journal of Instrumentation Technology & Innovations     Full-text available via subscription   (Followers: 2)
Journal of Medical Devices     Full-text available via subscription   (Followers: 4)
Journal of Medical Signals and Sensors     Open Access   (Followers: 1)
Journal of Optical Technology     Full-text available via subscription   (Followers: 4)
Journal of Research of NIST     Open Access   (Followers: 1)
Journal of Sensors and Sensor Systems     Open Access   (Followers: 12)
Journal of Vacuum Science & Technology B     Hybrid Journal   (Followers: 1)
Jurnal Informatika Upgris     Open Access  
Measurement : Sensors     Open Access   (Followers: 5)
Measurement and Control     Open Access   (Followers: 36)
Measurement Instruments for the Social Sciences     Open Access  
Measurement Techniques     Hybrid Journal   (Followers: 3)
Medical Devices & Sensors     Hybrid Journal   (Followers: 1)
Metrology and Instruments / Метрологія та прилади     Open Access  
Metrology and Measurement Systems     Open Access   (Followers: 8)
Microscopy     Hybrid Journal   (Followers: 7)
Modern Instrumentation     Open Access   (Followers: 57)
Optoelectronics, Instrumentation and Data Processing     Hybrid Journal   (Followers: 4)
PFG : Journal of Photogrammetry, Remote Sensing and Geoinformation Science     Hybrid Journal   (Followers: 4)
Photogrammetric Engineering & Remote Sensing     Full-text available via subscription   (Followers: 32)
Remote Sensing     Open Access   (Followers: 57)
Remote Sensing Applications : Society and Environment     Full-text available via subscription   (Followers: 9)
Remote Sensing of Environment     Hybrid Journal   (Followers: 94)
Remote Sensing Science     Open Access   (Followers: 30)
Review of Scientific Instruments     Hybrid Journal   (Followers: 20)
Science of Remote Sensing     Open Access   (Followers: 7)
Sensors International     Open Access   (Followers: 3)
Solid State Nuclear Magnetic Resonance     Hybrid Journal   (Followers: 3)
Standards     Open Access  
Transactions of the Institute of Measurement and Control     Hybrid Journal   (Followers: 12)
Videoscopy     Full-text available via subscription   (Followers: 5)
Труды СПИИРАН     Open Access  
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Journal Cover
Instruments and Experimental Techniques
Journal Prestige (SJR): 0.314
Citation Impact (citeScore): 1
Number of Followers: 1  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1608-3180 - ISSN (Online) 0020-4412
Published by Springer-Verlag Homepage  [2469 journals]
  • A Measuring System for Assessing the Quality of Power Conversion Equipment
           for Testing Power-Supply Systems of Spacecraft

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      Abstract: — Methods for measuring the impedance of power conversion equipment are analyzed in order to show their general principle of implementation. A measuring system is proposed based on this principle as applied to power conversion equipment for testing power-supply systems of spacecrafts. The system allows measurement of the impedance modulus at frequencies ranging from 10 Hz to 10 MHz at a load voltage as high as 105 V. At the same time, the maximum load current (amplitude) in the frequency range of up to 70 kHz is 12.5 A or higher with an acceptable decrease in the maximum value to 10 A according to the linear law in the frequency range of 70−100 kHz. In the frequency range from 100 kHz to 10 MHz, the maximum current decreases with increasing frequency, but no more than by 20 dB/decade. A frequency-controlled load device has been developed for removing transient processes in power-conversion equipment used for testing power-supply systems of spacecraft. Using this device, it is possible to perform specific operating modes, such as variations of mutual transitions between the nominal mode and the short-circuit and idle modes.
      PubDate: 2022-04-01
       
  • Advanced Universal Hydrostatic Pressure Device with Pneumatic Amplifier
           for the Investigation of the Electrical and Thermal Properties of
           Semiconductors under Hydrostatic Pressure

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      Abstract: A new design of a universal hydrostatic pressure device with a pneumatic amplifier for studying the electrophysical properties of semiconductors with deep impurity centers under hydrostatic pressure has been developed. The device makes it possible to perform a pulsed action of hydrostatic pressure on the test sample in two modes. This is a thermo mode in which the action of a pulsed pressure leads to an increase in the temperature of the sample and an isothermal mode in which the action of pressure is carried out without changing the temperature. It is shown, that the second mode provides the possibility to observe relaxation effects in semiconductors with deep levels at pulse pressure. The technical possibilities of the proposed device make it possible to carry out a study in both hydro-chamber modes in a range of pressures of 0–2 GPa and a temperature of 273–500 K. The maximum rate of pressure build-up in the thermal mode of the dP/dt = 2 × 108 Pa/s. In addition, in the isothermal mode of the hydrochamber, the pressure spreads almost instantaneously.
      PubDate: 2022-04-01
       
  • An Asymmetric Current Battery Charger

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      Abstract: Abstract A charger for low-voltage lead-acid storage batteries with asymmetric current is described. The applied topology of the double active bridge made it possible to provide a bi-directional mode of operation necessary for the formation of recovery charge-discharge cycles formed by asymmetric bipolar charging current pulses with levels of –7 and +20 A of various durations with a frequency of 10 Hz. The developed matching transformer is made on the ELP 38 magnetic core with a high-current single-turn winding from a copper bus.
      PubDate: 2022-04-01
       
  • An Apparatus Based on a CO2-Laser with Feedback for Automated Precision
           Evaporation of Biological Tissues

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      Abstract: Abstract A CO2-laser-based apparatus with feedback for automated precision evaporation of biological tissues has been developed. Precision layer-by-layer evaporation is carried out using a galvanometric scanner inside a predefined zone, which can be of any shape, specified by a computer. The apparatus makes it possible to record the autodyne signal and its derivatives (signal power and weighted average frequency in a given frequency range) during the evaporation process and simultaneously record the evaporation process using a digital microscope. The apparatus can be used for research and development of new approaches to precision low-trauma laser operations using robotic surgical systems with feedback.
      PubDate: 2022-04-01
       
  • High Beam Quality and High Power Mode-locked Solid-state Laser for
           Photocathode Drive Laser System

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      Abstract: Solid-state lasers with high power and high beam quality have important applications, such as the photocathode electron sources. The alignment accuracy of the laser cavity impacts the output stability and beam quality of the solid state laser. The alignment precision of the gain crystal is especially critical for laser resonator. This paper reports the development of a solid-state laser. The laser resonant cavity consists of a Nd:YVO4 gain crystal, a 880 nm pump, and a semiconductor saturable absorber mirror (SESAM) for mode-locking. A specially designed crystal fixing frame with collimators with varying diameters are employed for the crystal alignment. This laser could produce 6 W of output power at 162.5 MHz of repetition rate. The beam quality M2 is very close to 1.
      PubDate: 2022-04-01
       
  • An Experimental Stand for Studying the Effect of Synchronous Gas Injection
           on High-Current Arc Quenching

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      Abstract: – An experimental stand for studying the effect of synchronous gas injection on high-current arc quenching is described, and results obtained with it are presented. An electrodischarge experimental setup for simulating the process of high-pressure cold gas injection into the arcing region at a certain instant in time is part of this stand. A capacitor bank with a capacitance of 38 mF, as well as various measurement and diagnostic systems, are included in the stand. Experiments have been carried out with arcs at a current amplitude of 3–25 kA, a current half-period duration of 10 ms, and a capacitor-bank charging voltage of 0.8–4.5 kV.
      PubDate: 2022-04-01
       
  • A Multichannel Analog-to-Digital Converter for Seismoacoustic Applications

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      Abstract: Abstract The authors describe a compact analog-to-digital converter for high-resolution seismoacoustic studies and provide its technical characteristics. The converter has a capacity of 24 bits and 16 channels with the possibility of increasing their number by combining converters into a network. A local Ethernet network is used to exchange data with the control computer, which provides high speed (100 Mbit/s) and interface versatility. Distributed data acquisition systems based on the transducer can be used in surface, borehole, or marine seismic acoustics, as well as in hydroacoustics.
      PubDate: 2022-04-01
       
  • The Use of Simultaneous Tuning of Several Control Parameters to Stabilize
           the Radiation Power of a Subterahertz Gyrotron when Tuning the Generation
           Frequency

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      Abstract: Abstract The results of theoretical and experimental studies aimed at ensuring long-term stability of the power of a subterahertz gyrotron when tuning the generation frequency are presented. Power stabilization is performed via the coordinated change in the technical parameters of the generation mode. Two pairs of such parameters are considered: the accelerating voltage and the temperature of the resonator coolant or the magnetic field and the temperature of the resonator coolant. As a result of experiments performed with a subterahertz gyrotron of a kilowatt power level, power stability was demonstrated at a level of several percent with a frequency tuning range of more than 100 MHz, which confirms the correctness of the proposed approaches.
      PubDate: 2022-04-01
       
  • Measurement and Analysis of the Angular Selectivity Characteristics of
           Holograms in Photopolymer Materials

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      Abstract: — The hardware and software of a stand for measuring the angular selectivity characteristics of transmission and reflection holograms have been upgraded. As a result, the information content and the accuracy of optical signal measurements have been increased. The angular selectivity characteristics of holographic gratings with arbitrary values of parameters recording beams in thick-layer and thin photopolymers have been measured and analyzed. Based on these data, it is possible to reveal new information on the nature and the inhomogeneity of the spatial structure of analyzed holograms. Recommendations for practical application of various holographic photopolymer materials are presented.
      PubDate: 2022-04-01
       
  • A Telescope for Imaging the Sun on Board CubeSat Small Spacecraft

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      Abstract: — A small space telescope intended for imaging the Sun on board CubeSat small spacecraft has been developed and produced in the form of a ground-based model. A compact two-mirror optical system has been proposed for the telescope and tested. Using it, high-quality images of the Sun can be obtained with an angular resolution of better than 4″ in the EUV spectral region of the solar spectrum, where the main radiation of active solar processes lies. The expected quality was simulated for images that cannot be experimentally obtained and investigated under the ground conditions. The ability of the telescope to record all principal phenomena of the solar activity (flares and eruptive prominences) has been confirmed.
      PubDate: 2022-04-01
       
  • Rupture Tests of Reinforcing Fibers and a Unidirectional Laminate Using
           Acoustic Emissions

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      Abstract: Experiments on the fracture testing of reinforcing fibers of composite materials and specimens of unidirectional laminates were performed using acoustic-emission diagnostics. The results were used to establish the correspondence between the fractures in the structure of polymer composite materials (PCMs) at the micro-, meso-, and macroscale levels and the acoustic emission (AE) pulses recorded in this process and their energy and temporal parameters. The establishment of such phenomenological dependences makes it possible to carry out selection of the registered AE pulses, combining them into energy clusters of the lower (L), medium (M), and upper (U) levels, which correspond to micro-, meso-, and macroscale fractures, respectively, in the composite-material structure. By controlling the redistribution of the weight content of AE pulses (Wi) in the energy clusters, whose total level is WL + WM + WU = 100%, in the product loading process, the damage accumulation in the structure of the PCM package at different scale levels is monitored by evaluating the residual structural strength via comparison of the current values of the parameters Wi with the thresholds [Wi] that are registered upon material failure.
      PubDate: 2022-04-01
       
  • Digital Detection of Optical Signals in a Near-Optical-Field Microscope

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      Abstract: — A digital electronic system for recovering an optical signal in an apertureless scanning near-optical-field microscope (ASNOM), which operates in the elastic scattering mode, is presented. A photodetector signal results from optical homodyning of light, for which a Michelson interferometer scheme is used. Oscillations of the probe tip at its resonance frequency (30–300 kHz), which initiate a periodic change in the tip–surface distance, are used as the modulating effect in the ASNOM. The amplitude of one or several higher harmonics of the tip oscillation frequency is used as the useful signal in the photocurrent spectrum. The additional phase modulation of homodyning light is provided by a periodic change in the length of the reference arm in the Michelson scheme, which allows one to reliably measure not only the amplitude of a near-field optical signal but also its phase. Digitization of the detector photocurrent signal directly at the input of the detecting system made it possible to perform complex algorithms for extracting useful signals. The modularity of the data-processing algorithms provides flexible signal-detection variants, as well as the reliable modification and adjustment of individual parts of an algorithm. The features of the instrument that generate measurement errors are considered.
      PubDate: 2022-04-01
       
  • A Method for Measuring the Transfer Function of Digital Cameras Used in
           Biomedical Computer Vision Systems

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      Abstract: Abstract The experimental results of testing the transfer function of Canon EOS 500D, AxioCam HS, and ToupCam 14MP cameras using the method proposed in this paper are presented. A diode-pumped solid-state laser (with a wavelength of 477 nm), an He–Ne laser (632.8 nm), and a tungsten–halogen lamp were used as light sources. The radiation power was varied by a spectral nine-stage attenuator (no. 7880171) and colored glasses (GOST 9411-91). It is shown that specialized cameras provide a shooting mode with a linear transfer function, while the transfer function for commercial cameras is linearized by its gamma correction.
      PubDate: 2022-04-01
       
  • Grazing-Incidence Focusing Optics for X-Ray Telescopes (Review)

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      Abstract: This review is devoted to the principles, state of the art, and problems of grazing-incidence optics for focusing soft X-ray radiation, which is used in telescopes at orbital stations. The possibilities of constructing light X-ray telescopes with a large effective data-collection area and good angular resolution, which are based on Kirkpatrick–Baez, Wolter, and “lobster eye” optics, are considered. Special attention is paid to the description of methods for optimizing the parameters for the production of X-ray optics and X-ray mirrors.
      PubDate: 2022-04-01
       
  • An Analysis of the Reliability of a Software Failure-Safe Array in the
           Organization of Long-Term Storage of Radio Interferometry Data with
           Ultra-Long Bases

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      Abstract: Abstract A significant increase in the recording speed of very long baseline radio interferometry (VLBI) data and, accordingly, their volume (on the order of several hundred terabytes) requires reliable storage of these data for the possibility of repeated processing. An array of disk drives with redundancy can serve as one of the options for a reliable fault-tolerant long-term storage system for VLBI data (RAID is Redundant Array of Independent Disks). This paper presents the results of a study of the reliability of RAID software in the implementation of the ZFS file system (Zettabyte File System) in the raidz and raidz2 variants (analogs of RAID5 and RAID6) of the VLBI data storage system using the example of standard server equipment, and recommendations for creating such a system for long-term storage of this data in the correlation processing center of the RAS.
      PubDate: 2022-04-01
       
  • Study on Hybrid Test Control System Based on MATLAB-STM32

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      Abstract: Hybrid test is a new seismic test method combining numerical simulation with physical test. It is an advanced test method to evaluate the performance of nonlinear structures and systems. This paper proposes a novel hybrid test control system based on MATLAB-STM32. The system uses the STM32 microcontroller as the main controller and electrodynamic vibrator as excitation source of system. Furthermore, a complete set of hybrid test control system which includes physical hardware test and numerical software simulation is established by using MATLAB-STM32 communication technology, PID control method, displacement sensors, force sensors, etc. It provides a test platform for nonlinear test structures, components that are difficult to model, or components that require performance testing. This system realizes the function of real-time two-way communication between MATLAB and STM32 microcontroller. It uses the finite element software OpenSees to establish the numerical substructure, which solves the problem of the collaborative work between the numerical simulation test and the physical test of the experimental substructure, and can simulate the hybrid dynamic seismic test of the damping structure. To test the control performance of the designed system, this paper selects the viscoelastic dampers as the test substructure, and the performance detection and test analysis are completed for the hybrid test of single-layer frame structure with a viscoelastic damper. The test results show that the data communication between the upper and lower computers is stable and the whole control system performs well on both dynamic and static behaviors.
      PubDate: 2022-04-01
       
  • 2D Surface Spin Waves in Dynamic Magnonic Crystals Created by a Surface
           Acoustic Wave in YIG Films

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      Abstract: — 2D surface magnetostatic waves (SMSWs) have been investigation in dynamic magnonic crystals (DMCs) produced by a surface acoustic wave (SAW) in a structure with an yttrium−iron garnet (YIG) film; the technique and results of this investigation are presented. The methods used to study the dependences as functions of the angle between the SMSW and SAW wave vectors are described. The angular dependences of the magnonic bandgap frequencies have been measured. It has been established that bandgaps with the transformation of a reflected SMSW into other types of magnetostatic waves (MSWs) exist at any value of the angle, while bandgaps in which a reflected SMSW does not experience transformation appear in a certain narrower range of angles. The angles of the directions of the wave vectors and the Poynting vector of the reflected SMSW have also been measured. These results are in good agreement with the calculation performed using the isofrequency curves method and the laws of inelastic SMSW scattering from a SAW.
      PubDate: 2022-04-01
       
  • Inversion Correction Method for NaI(Tl) Gamma Spectra on Arbitrary Energy
           Scale Based on the Function Theory of Random Variables

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      Abstract: Ambient temperature variation always causes serious spectral drifts in NaI(Tl) gamma spectrum due to the temperature sensitivity of NaI(Tl) spectrometer performance. It is crucial to eliminate spectral drifts for the applications of NaI(Tl) gamma spectroscopy. In this paper, an inversion correction algorithm of gamma spectrum based on the function theory of random variables was proposed. By introducing the energy scaling factor, the theoretical deposition energy spectrum on any energy scale in detector was obtained. To validate the algorithm, the actual measured 226Ra NaI(Tl) gamma spectra with serious spectral drifts were corrected on different energy scales. The results show that the spectral drifts and spectral intensity variation were effectively eliminated on each energy scale. The maximum relative drift of peak position, the maximum relative variation of peak height and that of FWHM were 36.34, 20.92, and 19.19% before correction, respectively, and after correction, they became 0.12, 2.58, and 2.62%, respectively. These results demonstrate the feasibility and practicality of the developed algorithm in this work for applications in enhancing the confidence degree of identifying NaI(Tl) gamma fingerprints of nuclear materials and the analytical accuracy of NaI(Tl) gamma spectra.
      PubDate: 2022-04-01
       
  • Reconstruction and Simulation of Experimental Data Using Test Measurements

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      Abstract: — Mathematical methods for reconstructing the parameters of investigated physical processes from the measurement data of linear time-invariant systems using test signals are proposed and analyzed. The proposed methods are applicable for reconstruction without intermediate determination of the transient response of the system and for simulating the response of measuring systems to a certain excitation. By using the test data, it is possible to dispense with analysis of measuring systems and modeling the measurement process. The regularization of solutions is involved in the reconstruction, which makes it possible to apply the proposed methods to solve ill-conditioned and ill-posed problems. Variants of reconstruction based on direct transformations and integral Fourier transforms are considered and a comparative analysis of these variants and their areas of application is carried out. Cases of data reconstruction in the form of finite and non-finite functions and the corresponding discrete data are analyzed and the discretization errors are estimated. The dependence of the reconstruction error on the noise levels and uncertainties in the initial data is analyzed. The results of numerical experiments on the reconstruction of one-dimensional data and two-dimensional images are presented.
      PubDate: 2022-04-01
       
  • Accurate Determination of Oscillating Mass Displacement in Seismometry
           Using the Moiré Technique

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      Abstract: In this paper, a new method based on the moiré technique is presented to calculate the displacement of the oscillating mass in seismometry and other oscillating systems in which the position and displacement of the mass are important. The oscillating system consists of a spring-suspended mass whose position is monitored using the moiré technique. To form the moiré pattern, two similar Ronchi gratings are used so that they are facing each other without physical contact. One of the gratings is fixed to the oscillating mass and the other to the body of the oscillating system. An arrangement consisting of a laser diode, a narrow slit, and a photodiode was also used to detect and record the signal from the displacement of the moiré fringes due to the oscillation of the suspended mass. Also, an algorithm for calculations and conversion of electrical signal into displacement signal is presented. To validate the equations and the proposed algorithm, simulated and real data were evaluated and the results were compared. The results show the high capability and accuracy of the moiré technique and proposed algorithm in determining the oscillating mass displacement.
      PubDate: 2022-04-01
       
 
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