Subjects -> INSTRUMENTS (Total: 63 journals)
Showing 1 - 16 of 16 Journals sorted alphabetically
Annali dell'Istituto e Museo di storia della scienza di Firenze     Hybrid Journal  
Applied Mechanics Reviews     Full-text available via subscription   (Followers: 27)
Bulletin of Social Informatics Theory and Application     Open Access   (Followers: 1)
Computational Visual Media     Open Access   (Followers: 4)
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: 9)
Experimental Astronomy     Hybrid Journal   (Followers: 39)
Flow Measurement and Instrumentation     Hybrid Journal   (Followers: 18)
Geoscientific Instrumentation, Methods and Data Systems     Open Access   (Followers: 4)
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: 103)
IEEE Sensors Letters     Hybrid Journal   (Followers: 3)
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems)     Open Access   (Followers: 3)
Imaging & Microscopy     Hybrid Journal   (Followers: 9)
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: 7)
International Journal of Instrumentation Science     Open Access   (Followers: 40)
International Journal of Measurement Technologies and Instrumentation Engineering     Full-text available via subscription   (Followers: 2)
International Journal of Metrology and Quality Engineering     Full-text available via subscription   (Followers: 4)
International Journal of Remote Sensing     Hybrid Journal   (Followers: 278)
International Journal of Remote Sensing Applications     Open Access   (Followers: 45)
International Journal of Sensor Networks     Hybrid Journal   (Followers: 4)
International Journal of Testing     Hybrid Journal   (Followers: 1)
Journal of Applied Remote Sensing     Hybrid Journal   (Followers: 83)
Journal of Astronomical Instrumentation     Open Access   (Followers: 3)
Journal of Instrumentation     Hybrid Journal   (Followers: 32)
Journal of Instrumentation Technology & Innovations     Full-text available via subscription   (Followers: 2)
Journal of Medical Devices     Full-text available via subscription   (Followers: 5)
Journal of Medical Signals and Sensors     Open Access   (Followers: 3)
Journal of Optical Technology     Full-text available via subscription   (Followers: 5)
Journal of Sensors and Sensor Systems     Open Access   (Followers: 11)
Journal of Vacuum Science & Technology B     Hybrid Journal   (Followers: 3)
Jurnal Informatika Upgris     Open Access  
Measurement : Sensors     Open Access   (Followers: 3)
Measurement and Control     Open Access   (Followers: 36)
Measurement Instruments for the Social Sciences     Open Access  
Measurement Science and Technology     Hybrid Journal   (Followers: 7)
Measurement Techniques     Hybrid Journal   (Followers: 3)
Medical Devices & Sensors     Hybrid Journal  
Medical Instrumentation     Open Access  
Metrology and Instruments / Метрологія та прилади     Open Access  
Metrology and Measurement Systems     Open Access   (Followers: 6)
Microscopy     Hybrid Journal   (Followers: 8)
Modern Instrumentation     Open Access   (Followers: 50)
Optoelectronics, Instrumentation and Data Processing     Hybrid Journal   (Followers: 4)
PFG : Journal of Photogrammetry, Remote Sensing and Geoinformation Science     Hybrid Journal  
Photogrammetric Engineering & Remote Sensing     Full-text available via subscription   (Followers: 29)
Remote Sensing     Open Access   (Followers: 55)
Remote Sensing Applications : Society and Environment     Full-text available via subscription   (Followers: 8)
Remote Sensing of Environment     Hybrid Journal   (Followers: 93)
Remote Sensing Science     Open Access   (Followers: 24)
Review of Scientific Instruments     Hybrid Journal   (Followers: 22)
Science of Remote Sensing     Open Access  
Sensors and Materials     Open Access   (Followers: 2)
Solid State Nuclear Magnetic Resonance     Hybrid Journal   (Followers: 3)
Standards     Open Access  
Transactions of the Institute of Measurement and Control     Hybrid Journal   (Followers: 13)
Труды СПИИРАН     Open Access  
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Journal of Astronomical Instrumentation
Number of Followers: 3  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2251-1717 - ISSN (Online) 2251-1725
Published by World Scientific Homepage  [118 journals]
  • An Ultra-High Time Resolution Cosmic-Ray Detection Mode for the Murchison
           Widefield Array

    • Authors: A. Williamson, C. W. James, S. J. Tingay, S. J. McSweeney, S. M. Ord
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      The radio-wavelength detection of extensive air showers (EASs) initiated by cosmic-ray interactions in the Earth’s atmosphere is a promising technique for investigating the origin of these particles and the physics of their interactions. The Low-frequency Array (LOFAR) and the Owens Valley Long Wavelength Array (OVRO-LWA) have both demonstrated that the dense cores of low-frequency radio telescope arrays yield detailed information on the radiation ground pattern, which can be used to reconstruct key EAS properties and infer the primary cosmic-ray composition. Here, we demonstrate a new observation mode of the Murchison Widefield Array (MWA), tailored to the observation of the sub-microsecond coherent bursts of radiation produced by EAS. We first show how an aggregate 30.72[math]MHz bandwidth ([math][math]kHz frequency channels) recorded at 0.1[math]ms resolution with the MWA’s voltage capture system (VCS) can be synthesized back to the full bandwidth Nyquist resolution of 16.3[math]ns. This process, which involves “inverting” two sets of polyphase filterbanks, retains 90.5% of the signal-to-noise of a cosmic-ray signal. We then demonstrate the timing and positional accuracy of this mode by resolving the location of a calibrator pulse to within 5[math]m. Finally, preliminary observations show that the rate of nanosecond radio-frequency interference (RFI) events is 0.1[math]Hz, much lower than that found at the sites of other radio telescopes that study cosmic rays. We conclude that the identification of cosmic rays at the MWA, and hence with the low-frequency component of the Square Kilometre Array, is feasible with minimal loss of efficiency due to RFI.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2021-02-24T08:00:00Z
      DOI: 10.1142/S2251171721500033
  • Quasi-Band-Limited Coronagraph for Extended Sources

    • Authors: Igor Loutsenko, Oksana Yermolayeva
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      We propose a class of graded coronagraphic “amplitude” image masks for a high throughput Lyot-type coronagraph that transmits light from an annular region around an extended source and suppresses light, with extremely high ratio, from elsewhere. The interior radius of the region is comparable with its exterior radius. The masks are designed using an idea inspired by approach due M. J. Kuchner and W. A. Traub (“band-limited” masks) and approach to optimal apodization by D. Slepian. One potential application of our masks is direct high-resolution imaging of exo-planets with the help of the Solar Gravitational Lens, where apparent radius of the “Einstein ring” image of a planet is of the order of an arc-second and is comparable with the apparent radius of the sun and solar corona.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2021-02-10T08:00:00Z
      DOI: 10.1142/S2251171721500021
  • Cumulative Author Index Volume 9 (2020)

    • Abstract: Journal of Astronomical Instrumentation, Volume 09, Issue 04, December 2020.

      Citation: Journal of Astronomical Instrumentation
      PubDate: 2020-12-29T08:00:00Z
      DOI: 10.1142/S2251171720990019
      Issue No: Vol. 09, No. 04 (2020)
  • A Bispectral Analysis of the Radio Emissions of Pulsar J0437-4715

    • Authors: Alexander Faustmann, Jacki Gilmore, Vereese van Tonder, Maciej Serylak
      Abstract: Journal of Astronomical Instrumentation, Volume 09, Issue 04, December 2020.
      A combination of the very low signal-to-noise ratio and the very large parameter space spanned by pulsar emissions makes pulsar detection a challenging task. Currently, brute force parameter searches are often used for pulsar detection and a cyclostationary Gaussian model is assumed for pulsar emissions. Higher-Order spectra offer high signal-to-noise ratio domains in problems where the desired signal is polluted by Gaussian noise. The presence of nonzero higher-order spectral components in pulsar bursts may offer alternative detection methods. This work presents a review of higher-order statistics and offers a motivation for their use in the characterization of pulsar bursts. A dish from the MeerKAT telescope was used to acquire recorded radio bursts from pulsar J0437-4715. These bursts were found to contain nonzero bispectral components that were dispersed in the same way as the components of the power spectrum.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2020-12-21T08:00:00Z
      DOI: 10.1142/S225117172050018X
      Issue No: Vol. 09, No. 04 (2020)
  • The Array of Long Baseline Antennas for Taking Radio Observations from the

    • Authors: H. C. Chiang, T. Dyson, E. Egan, S. Eyono, N. Ghazi, J. Hickish, J. M. Jáuregui-Garcia, V. Manukha, T. Ménard, T. Moso, J. Peterson, L. Philip, J. L. Sievers, S. Tartakovsky
      Abstract: Journal of Astronomical Instrumentation, Volume 09, Issue 04, December 2020.
      Measurements of redshifted 21[math]cm emission of neutral hydrogen at [math][math]MHz have the potential to probe the cosmic “dark ages,” a period of the universe’s history that remains unobserved to date. Observations at these frequencies are exceptionally challenging because of bright Galactic foregrounds, ionospheric contamination, and terrestrial radio-frequency interference. Very few sky maps exist at [math][math]MHz, and most have modest resolution. We introduce the Array of Long Baseline Antennas for Taking Radio Observations from the Sub-Antarctic (ALBATROS), a new experiment that aims to image low-frequency Galactic emission with an order-of-magnitude improvement in resolution over existing data. The ALBATROS array will consist of antenna stations that operate autonomously, each recording baseband data that will be interferometrically combined offline. The array will be installed on Marion Island and will ultimately comprise 10 stations, with an operating frequency range of 1.2–125[math]MHz and maximum baseline lengths of [math][math]km. We present the ALBATROS instrument design and discuss pathfinder observations that were taken from Marion Island during 2018–2019.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2020-12-21T08:00:00Z
      DOI: 10.1142/S2251171720500191
      Issue No: Vol. 09, No. 04 (2020)
  • A Data-Taking System for Planetary Radar Applications

    • Authors: Jean-Luc Margot
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      Most planetary radar applications require recording of complex voltages at sampling rates of up to 20[math]MHz. I describe the design and implementation of a sampling system that has been installed at the Arecibo Observatory, Goldstone Solar System Radar, and Green Bank Telescope. After many years of operation, these data-taking systems have enabled the acquisition of hundreds of datasets, many of which still await publication.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2020-12-21T08:00:00Z
      DOI: 10.1142/S225117172150001X
  • Performance Testing of a Large-Format X-ray Reflection Grating Prototype
           for a Suborbital Rocket Payload

    • Authors: Benjamin D. Donovan, Randall L. McEntaffer, Casey T. DeRoo, James H. Tutt, Fabien Grisé, Chad M. Eichfeld, Oren Z. Gall, Vadim Burwitz, Gisela Hartner, Carlo Pelliciari, Marlis-Madeleine La Caria
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      The soft X-ray grating spectrometer on board the Off-plane Grating Rocket Experiment (OGRE) hopes to achieve the highest resolution soft X-ray spectrum of an astrophysical object when it is launched via suborbital rocket. Paramount to the success of the spectrometer are the performance of the [math] reflection gratings populating its reflection grating assembly. To test current grating fabrication capabilities, a grating prototype for the payload was fabricated via electron-beam lithography at The Pennsylvania State University’s Materials Research Institute and was subsequently tested for performance at Max Planck Institute for Extraterrestrial Physics’ PANTER X-ray Test Facility. Bayesian modeling of the resulting data via Markov chain Monte Carlo (MCMC) sampling indicated that the grating achieved the OGRE single-grating resolution requirement of [math] at the 94% confidence level. The resulting [math] posterior probability distribution suggests that this confidence level is likely a conservative estimate though, since only a finite [math] parameter space was sampled and the model could not constrain the upper bound of [math] to less than infinity. Raytrace simulations of the tested system found that the observed data can be reproduced with a grating performing at [math]. It is therefore postulated that the behavior of the obtained [math] posterior probability distribution can be explained by a finite measurement limit of the system and not a finite limit on [math]. Implications of these results and improvements to the test setup are discussed.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2020-11-27T08:00:00Z
      DOI: 10.1142/S2251171720500178
  • Impact of Ground Parameters on Performances of an Active Phased Array
           Element of the Low-Frequency Radio Telescope GURT

    • Authors: Peter Tokarsky, Alexander Konovalenko, Mykola Kalinichenko, Serge Yerin
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      This paper presents the technique of numerical estimation of ground parameters impact on the performances of an active antenna used as an element of a phased array antenna of a modern low-frequency radio telescope. Three ground conditions were considered, two of them wet and dry, which correspond to the extreme values of seasonal deviations of its parameters, as well as its median state (“normal ground”). The results of computer simulation are given for the active antenna of the GURT radio telescope with a ground screen in the form of a square wire grid of [math][math]m and without it. It is shown that the addition of the ground screen markedly reduces the influence of the ground conditions on some parameters of the antenna, in particular, the dipole impedance and radiation efficiency. At the same time, the ground screen does not protect the most important antenna parameters for radio astronomy, such as sensitivity and absorption area, from the impact of the ground conditions changes. Variations of these parameters for an active antenna with a screen remain approximately the same as without it.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2020-10-12T07:00:00Z
      DOI: 10.1142/S2251171720500154
  • Scalable Digital Receiver for Multi-Element Radio Telescopes

    • Authors: C. R. Subrahmanya, O. S. Sarun, Yogindra Abhyankar, Sajish Chandrababu, Chinmay Bahulekar
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      Modern and upcoming radio telescopes at low frequencies are often characterized by hundreds or thousands of antenna elements operating at wide bandwidths up to about 0.5[math]GHz. A spectral correlator for such an array is required to estimate the cross-power spectrum of the response of each element with that of every other element with a high spectral resolution. The resulting all-to-all connectivity between signals from the entire array poses a serious bottleneck. In this paper, we propose a simple digital receiver architecture that interfaces the digitized time series from a large number of antenna elements to a High-Performance Computing (HPC) cluster through a communication switch to overcome the data ingest bottleneck. Each HPC node can then perform wideband processing in steps of finite but significant time-slices for the entire array. We explain in detail the implementation of our architecture for the proposed expansion of the Ooty Wide Field Array (OWFA) into a 1056 element array. Since the proposed digital receiver is based on Field Programmable Gate Array (FPGA), it can be reconfigured for different applications. This is illustrated by considering the case of Phased Array Feeds (PAF) for the proposed expanded Giant Metrewave Radio Telescope (eGMRT).
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2020-10-07T07:00:00Z
      DOI: 10.1142/S2251171720500166
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