Subjects -> INSTRUMENTS (Total: 63 journals)
Showing 1 - 16 of 16 Journals sorted by number of followers
International Journal of Remote Sensing     Hybrid Journal   (Followers: 151)
IEEE Sensors Journal     Hybrid Journal   (Followers: 112)
Remote Sensing of Environment     Hybrid Journal   (Followers: 96)
Journal of Applied Remote Sensing     Hybrid Journal   (Followers: 88)
Remote Sensing     Open Access   (Followers: 57)
Modern Instrumentation     Open Access   (Followers: 57)
International Journal of Remote Sensing Applications     Open Access   (Followers: 49)
International Journal of Instrumentation Science     Open Access   (Followers: 41)
Experimental Astronomy     Hybrid Journal   (Followers: 39)
Measurement and Control     Open Access   (Followers: 36)
Photogrammetric Engineering & Remote Sensing     Full-text available via subscription   (Followers: 33)
Journal of Instrumentation     Hybrid Journal   (Followers: 31)
Remote Sensing Science     Open Access   (Followers: 30)
Applied Mechanics Reviews     Full-text available via subscription   (Followers: 27)
Review of Scientific Instruments     Hybrid Journal   (Followers: 20)
European Journal of Remote Sensing     Open Access   (Followers: 18)
Flow Measurement and Instrumentation     Hybrid Journal   (Followers: 15)
Journal of Sensors and Sensor Systems     Open Access   (Followers: 12)
Transactions of the Institute of Measurement and Control     Hybrid Journal   (Followers: 12)
Remote Sensing Applications : Society and Environment     Full-text available via subscription   (Followers: 9)
Videoscopy     Full-text available via subscription   (Followers: 9)
International Journal of Applied Mechanics     Hybrid Journal   (Followers: 8)
Metrology and Measurement Systems     Open Access   (Followers: 8)
Science of Remote Sensing     Open Access   (Followers: 7)
Imaging & Microscopy     Hybrid Journal   (Followers: 7)
Instrumentation Science & Technology     Hybrid Journal   (Followers: 7)
Microscopy     Hybrid Journal   (Followers: 7)
International Journal of Metrology and Quality Engineering     Full-text available via subscription   (Followers: 6)
Computational Visual Media     Open Access   (Followers: 5)
Measurement : Sensors     Open Access   (Followers: 5)
PFG : Journal of Photogrammetry, Remote Sensing and Geoinformation Science     Hybrid Journal   (Followers: 5)
Optoelectronics, Instrumentation and Data Processing     Hybrid Journal   (Followers: 5)
Journal of Astronomical Instrumentation     Open Access   (Followers: 4)
IEEE Sensors Letters     Hybrid Journal   (Followers: 4)
Sensors and Materials     Open Access   (Followers: 4)
Journal of Optical Technology     Full-text available via subscription   (Followers: 4)
Journal of Medical Devices     Full-text available via subscription   (Followers: 4)
Measurement Techniques     Hybrid Journal   (Followers: 3)
Sensors International     Open Access   (Followers: 3)
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems)     Open Access   (Followers: 3)
IEEE Journal on Miniaturization for Air and Space Systems     Hybrid Journal   (Followers: 3)
Solid State Nuclear Magnetic Resonance     Hybrid Journal   (Followers: 3)
Journal of Instrumentation Technology & Innovations     Full-text available via subscription   (Followers: 2)
International Journal of Sensor Networks     Hybrid Journal   (Followers: 2)
Geoscientific Instrumentation, Methods and Data Systems     Open Access   (Followers: 2)
International Journal of Testing     Hybrid Journal   (Followers: 1)
Medical Devices & Sensors     Hybrid Journal   (Followers: 1)
Invention Disclosure     Open Access   (Followers: 1)
Journal of Research of NIST     Open Access   (Followers: 1)
Geoscientific Instrumentation, Methods and Data Systems Discussions     Open Access   (Followers: 1)
International Journal of Measurement Technologies and Instrumentation Engineering     Full-text available via subscription   (Followers: 1)
Journal of Medical Signals and Sensors     Open Access   (Followers: 1)
Instruments and Experimental Techniques     Hybrid Journal   (Followers: 1)
Journal of Vacuum Science & Technology B     Hybrid Journal   (Followers: 1)
Metrology and Instruments / Метрологія та прилади     Open Access  
Measurement Instruments for the Social Sciences     Open Access  
Труды СПИИРАН     Open Access  
Standards     Open Access  
Jurnal Informatika Upgris     Open Access  
InfoTekJar : Jurnal Nasional Informatika dan Teknologi Jaringan     Open Access  
Devices and Methods of Measurements     Open Access  
EPJ Techniques and Instrumentation     Open Access  
Documenta & Instrumenta - Documenta et Instrumenta     Open Access  
Similar Journals
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Journal of Astronomical Instrumentation
Number of Followers: 4  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2251-1717 - ISSN (Online) 2251-1725
Published by World Scientific Homepage  [120 journals]
  • Exoplanet detection with Genesis

    • Authors: Koko Visser, Bas Bosma, Eric Postma
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      Convolutional Neural Networks (CNNs) have shown to offer a consistent and reliable foundation for the automatic detection of potential exoplanets. CNNs rely on an abundance of parameters (overparameterization) to achieve their impressive detection performances. Astronet was one of the first CNNs for exoplanet detection. It takes as input folded lightcurves in two views: a local view (the transit) and a global view (the entire orbital period including the transit). A more recent CNN called Exonet-XS improved on Astronet’s performance while having considerably less parameters, thereby reducing the risk of overfitting. Exonet-XS also uses two views as input. In this paper, we propose Genesis, an even more simplified CNN for exoplanet detection from folded lightcurves using only one view. In addition, we propose to use a more reliable validation procedure that is custom in CNN-based exoplanet detection studies: the Monte Carlo Cross-Validation (MCCV) procedure. We show that the use of MCCV improves the reliability of the estimation of the detection performance by providing a (discretized) probability distribution, rather than a point estimate. Using MCCV we show that Astronet with only one view performs on a par with the original two-view version. More importantly, our fair comparative evaluation (without stellar parameters and centroids) reveals that Genesis outperforms Exonet-XS and Astronet. We conclude by stating that existing exoplanet detection CNNs are too complex for the task at hand and that future evaluations of performances should use MCCV or similar validation procedures.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2022-06-24T07:00:00Z
      DOI: 10.1142/S2251171722500118
       
  • A Preliminary Plan to Quickly Restore Utility to the Arecibo 305[math]m
           Telescope

    • Authors: Dale C. Ferguson, James K. Breakall, Paul A. Bernhardt, Felix Fernandez, Christiano Brum, Alfredo III Santoni-Ruiz, Robert B. Kerr, Robert L. Williams II
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      Since the fall of the Arecibo 305[math]m telescope platform on 2020 December 1, there has been much discussion of building a new Arecibo telescope or rebuilding the facility that was destroyed. In the collapse, the top of the three platform support towers was sheared off, and the feed arm fell free from the swinging platform and destroyed 25% of the dish. Fortunately, the Control Building, the home of the computers, spectrometers, masers, atomic clocks, 430[math]MHz Klystrons, etc., was spared. By replacing the main dish support cables and resurfacing with coarse mesh, the main dish can be repaired as a reflector [math] operation. By replacing the damaged aluminum panels to make the dish whole again, RF operations at up to 500[math]MHz can be resumed. In this paper, we outline the steps that can be taken to restore High Frequency (HF, 3–30[math]MHz) ionospheric heating, 430[math]MHz ionospheric incoherent scattering radar, passive radio observations of satellite arcing and pulsars, and to extend the field of regard to 47∘ from the zenith. This would restore and improve much of the utility of the Arecibo dish. Part of this plan involves supporting, positioning and pointing novel point feeds from lightweight football-camera-like cables, strung from the rebuilt tower tops. It is believed that the dish may thus become broadly useful long before replacement facilities can be engineered and constructed.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2022-06-24T07:00:00Z
      DOI: 10.1142/S225117172250012X
       
  • The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS)

    • Authors: P. R. Champey, A. R. Winebarger, K. Kobayashi, P. S. Athiray, E. Hertz, S. Savage, B. Beabout, D. Beabout, D. Broadway, A. R. Bruccoleri, P. Cheimets, J. Davis, J. Duffy, L. Golub, D. A. Gregory, C. Griffith, H. Haight, R. K. Heilmann, B. Hogue, J. Hohl, D. Hyde, J. Kegley, J. Kolodzieczjak, B. Ramsey, J. Ranganathan, B. Robertson, M. L. Schattenburg, C. O. Speegle, G. Vigil, R. Walsh, B. Weddenorf, E. Wright
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) is a sounding rocket instrument that flew on July 30, 2021 from the White Sands Missile Range, NM. The instrument was designed to address specific science questions that require differential emission measures of the solar soft X-ray spectrum from 6 – 25[math]Å(0.5 – 2.1[math]keV). MaGIXS comprises a Wolter-I telescope, a slit-jaw imaging system, an identical pair of grazing incidence paraboloid mirrors, a planar grating and a CCD camera. While implementing this design, some limitations were encountered in the production of the X-ray mirrors, which ended up as a catalyst for the development of a deterministic polishing approach and an improved meteorological technique that utilizes a computer-generated hologram (CGH). The opto-mechanical design approach addressed the need to have adjustable and highly repeatable interfaces to allow for the complex alignment between the optical sub-assemblies. The alignment techniques employed when mounting the mirrors and throughout instrument integration and end-to-end testing are discussed. Also presented are spatial resolution measurements of the end-to-end point-spread-function that were obtained during testing in the X-ray Cryogenic Facility (XRCF) at NASA Marshall Space Flight Center. Lastly, unresolved issues and off-nominal performance are discussed.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2022-06-15T07:00:00Z
      DOI: 10.1142/S2251171722500106
       
  • Performance Analysis Techniques for Real-Time Broadband RFI Filtering
           System of uGMRT

    • Authors: K. D. Buch, R. Kale, K. D. Naik, R. Aragade, M. Muley, S. Kudale, B. Ajith Kumar
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      Electromagnetic radiation from human activities, known as man-made Radio Frequency Interference (RFI), adversely affects radio astronomy observations. In the vicinity of the Upgraded Giant Metrewave Radio Telescope (uGMRT) array, the sparking on power lines is the major cause of interference at observing frequencies less than 800[math]MHz. A real-time broadband RFI detection and filtering system is implemented as part of the uGMRT wideband signal processing backend to mitigate the effect of broadband RFI. Performance analysis techniques used for testing and commissioning the system for observations in the beamformer and correlator modes of the uGMRT are presented. The concept and implementation of recording simultaneous unfiltered and filtered data along with data analysis and interpretation is illustrated using an example. For the beamformer mode, spectrogram, single spectral channel, and its Fourier transform is used for performance analysis whereas, in the correlator mode, the cross-correlation function, closure phase, and visibilities from the simultaneously recorded unfiltered and filtered is carried out. These techniques are used for testing the performance of the broadband RFI filter and releasing it for uGMRT users.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2022-04-28T07:00:00Z
      DOI: 10.1142/S2251171722500088
       
  • Evaluation of Controllers and Development of a New In-House Controller for
           the Teledyne HxRG Focal Plane Array for the IRSIS Satellite Payload

    • Authors: M. B. Naik, D. K. Ojha, S. K. Ghosh, P. Manoj, J. P. Ninan, S. Ghosh, S. L. A. D’Costa, S. S. Poojary, S. B. Bhagat, P. R. Sandimani, H. Shah, R. B. Jadhav, S. M. Gharat, G. S. Meshram, B. G. Bagade
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      The Infrared Astronomy Group (Department of Astronomy and Astrophysics) at Tata Institute of Fundamental Research (TIFR) is presently developing controllers for the Teledyne HxRG Focal Plane Arrays (FPAs) to be used on board the Infrared Spectroscopic Imaging Survey (IRSIS) satellite payload. In this paper, we discuss the results of our tests with different FPA controllers such as the Astronomical Research Cameras (ARC) controller, Teledyne’s SIDECAR ASIC as well as our new in-house designed Array controller. As part of the development phase of the IRSIS instrument, which is an optical fiber-based Integral Field Unit (IFU) Near-Infrared (NIR) Spectrometer, a laboratory model with limited NIR bandwidth was built which consisted of various subsystems like a Ritchey–Chretien (RC) 30[math]cm telescope, optical fiber IFU, spectrometer optics, and the Teledyne H2RG detector module. We discuss the various developments during the building and testing of the IRSIS laboratory model and the technical aspects of the prototype in-house H2RG controller.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2022-04-08T07:00:00Z
      DOI: 10.1142/S225117172250009X
       
  • SDR Pathfinder for Understanding Transient and Noise-Level Interference in
           the Karoo (SPUTNIK)

    • Authors: Alec T. Josaitis, David R. DeBoer, Eloy de Lera Acedo
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      In this work, the SDR Pathfinder for Understanding Transient and Noise-level Interference in the Karoo (SPUTNIK) is presented. We describe how a low-cost radio frequency interference (RFI) monitoring system, using solely consumer-off-the-shelf (COTS) components, directly contributes to the analysis efforts of a precision 21[math]cm cosmology instrument. A SPUTNIK system overview is provided, as well as a generalized software-defined radio (SDR) internal calibration technique to achieve wideband, [math][math]dBm-level accuracy and a measured dynamic range of [math][math]dB.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2022-03-23T07:00:00Z
      DOI: 10.1142/S2251171722500064
       
  • Compact Scintillator Array Detector (ComSAD) for Sounding Rocket and
           CubeSat Missions

    • Authors: Pu Kai Wang, Chih-Yun Chen, Hsiang-Chieh Hsu, Mu-Hsin Chang, Wei Tai Liu, Hui-Kuan Fang, Ting-Chou Wu, Wen-Hao Chen, Chin Cheng Tsai, Alfred Bing-Chih Chen, Yi Yang
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      The development of CubeSats and more frequent launch chances of sounding rockets are a total game changer to the space program, and it allows us to build space instruments that are technologically feasible and affordable. Therefore, it gives us a good opportunity to build a small cosmic-ray detector which has capabilities to measure the flux, direction, and even energy of cosmic rays at an altitude above the limitation of balloon experiments, and it may open a new door for building a constellation of detectors to study cosmic-ray physics. Compact Scintillator Array Detector (ComSAD) is a funded sounding rocket mission of Taiwan’s National Space Organization. In this paper, we present the concept, design, and performance of ComSAD which is also suitable for future CubeSat missions.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2022-03-23T07:00:00Z
      DOI: 10.1142/S2251171722500076
       
  • Life Cycle of Data Processing Center of RadioAstron Project

    • Authors: Marina V. Shatskaya, Nikolai A. Fedorov, Sergey F. Likhachev, Sergey I. Seliverstov, Dmitry A. Sychev
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      This paper is about the Data Processing Center (DPC) working within the RadioAstron project. Since the launch of the space radio telescope to orbit in July 2011, the DPC underwent significant quantitative and qualitative changes as the project developed. This paper describes the schemes, structure, stages of the processing center development, current upgrades and new technologies introduced in the DPC throughout the entire period of its operation. For technical reasons, the scheduled observations in the project were terminated in January 2019. However, still the work of the DPC continued. Today, the most valuable thing we have is information. There is now a unique archive of service and scientific data of the project in our possession, and a data bank of the RadioAstron project is underway, which will ensure a proper access to scientific and service information for all interested experts, as well as provide an opportunity for an additional data analysis.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2022-03-09T08:00:00Z
      DOI: 10.1142/S2251171722500040
       
  • Mersenne Beam-Compressor with Field-Flattener Optics as Main Telescope
           Design for Extremely Large Telescopes and Telescope Arrays

    • Authors: Nishant Neeraj Gadey
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      The Mersenne beam-compressor is the fundamental arrangement for two mirror reflecting telescopes. The Mersenne beam-compressor consists of two confocal paraboloids. The design produces an aberration-free, collimated output beam, which makes it easy to relocate the beam to any distant location. This property of Mersenne beam compressors makes them near-ideal for telescopes with requirements for ultra-stable instruments and interferometric applications. The only problem against such application is the Petzval field curvature that is induced in the output beam. This becomes very pronounced at very high compression ratios, which are required for interferometry with large aperture telescopes. The high compression ratio is a problem because, such large aperture telescopes are also required to deliver good performance at Nasmyth and Coude locations, to be feasible. This is not possible at high compression ratios using conventional design of Mersenne beam-compressor, due to prohibitively strong field curvature. Here, we propose powered and un-powered field-flattener optics to address the problem of field curvature in Mersenne beam-compressor. After passing through this set of optics, the output beam is completely aberration free. This arrangement can produce very high compression ratios, which are useful for various special applications. We also illustrate the performance of such a system using example designs. The performance analysis shows that such a design can give considerably high performance at distant locations of foci as compared to existing relay systems.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2022-03-05T08:00:00Z
      DOI: 10.1142/S2251171722500052
       
  • Experimental Validation of a Novel Concept to Reduce Optical Surface Wave
           Front Errors by Using Deformable Bushes at Opto-Mechanical Interfaces

    • Authors: S. Nagabhushana, B. Raghavendra Prasad, Suresh Nagesh, Suresh Venkata Nara, D. S. Sandeep, P. U. Kamath, Shalab Misra, Bhavana Hegde, D. Utkarsha, Mrityunjay Kumar Sinha, S. Kathiravan, V. Natarajan, S. Pawan Kumar, Amit Kumar
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      One of the major objectives of the optomechanics is to support large optics required for the purpose and also to maintain high dynamic stability in operation. This requirement calls for more number of supports, to support large optics. While addressing this issue, the mounting system tends to become non-kinematic and distorts the optical surface and leads to poor image quality. The distorted optical surfaces bring in increased RMS surface wavefront errors which will result in poor image quality. In this context, a new concept is proposed in our previous publication (Nagabhushana et al., 2021) which involves introduction of deformable bushes at the optomechanical interfaces. These are deformed by applied clamping forces and also enabling all degrees of freedom (DOF) to be arrested. This also ensures that the clamping force in axial DOF is limited to a minimal value. This technique enables to arrest of axial DOF without exerting the clamping force on the optomechanical assembly there by reduces optical aberrations and improves the mounting system’s dynamic stability. This is because deformable bushes absorb all the clamping forces and the strain has no impact on the mount and therefore does not lead deformation of the optical surface. The clamping forces are simulated by Finite Element (FE) methods. Further, in this paper, the concept is verified and validated by experiments. The simulation results are observed to be in close correlation with experiment results. Improved stability is also observed by additional constraints introduced to optomechanical mounts with no compromise in wavefront errors.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2022-03-02T08:00:00Z
      DOI: 10.1142/S2251171722500039
       
  • Radio Antenna Design for Sky-Averaged 21[math]cm Cosmology Experiments:
           The REACH Case

    • Authors: J. Cumner, E. de Lera Acedo, D. I. L. de Villiers, D. Anstey, C. I. Kolitsidas, B. Gurdon, N. Fagnoni, P. Alexander, G. Bernardi, H. T. J. Bevins, S. Carey, J. Cavillot, R. Chiello, C. Craeye, W. Croukamp, J. A. Ely, A. Fialkov, T. Gessey-Jones, Q. Gueuning, W. Handley, R. Hills, A. T. Josaitis, G. Kulkarni, A. Magro, R. Maiolino, P. D. Meerburg, S. Mittal, J. R. Pritchard, E. Puchwein, N. Razavi-Ghods, I. L. V. Roque, A. Saxena, K. H. Scheutwinkel, E. Shen, P. H. Sims, O. Smirnov, M. Spinelli, K. Zarb-Adami
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      Following the reported detection of an absorption profile associated with the 21[math]cm sky-averaged signal from the Cosmic Dawn by the EDGES experiment in 2018, a number of experiments have been set up to verify this result. This paper discusses the design process used for global 21[math]cm experiments, focusing specifically on the Radio Experiment for the Analysis of Cosmic Hydrogen (REACH). This experiment will seek to understand and compensate for systematic errors present using detailed modeling and characterization of the instrumentation. Detailed quantitative figures of merit and numerical modeling are used to assist the design process of the REACH dipole antenna (one of the two antenna designs for REACH Phase I). This design process produced a 2.5:1 frequency bandwidth dipole. The aim of this design was to balance spectral smoothness and low impedance reflections with the ability to describe and understand the antenna response to the sky signal to inform the critically important calibration during observation and data analysis.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2022-02-09T08:00:00Z
      DOI: 10.1142/S2251171722500015
       
  • Characterization and Quantum Efficiency Determination of Monocrystalline
           Silicon Solar Cells as Sensors for Precise Flux Calibration

    • Authors: Sasha Brownsberger, Lige Zhang, David Andrade, Christopher W. Stubbs
      Abstract: Journal of Astronomical Instrumentation, Ahead of Print.
      As the precision frontier of astrophysics advances toward the one millimagnitude level, flux calibration of photometric instrumentation remains an ongoing challenge. We present the results of a lab-bench assessment of the viability of monocrystalline silicon solar cells to serve as large-aperture (up to 125[math]mm diameter), high-precision photodetectors. We measure the electrical properties, spatial response uniformity, quantum efficiency (QE), and frequency response of third-generation C60 solar cells, manufactured by Sunpower. Our new results, combined with our previous study of these cells’ linearity, dark current, and noise characteristics, suggest that these devices hold considerable promise, with QE and linearity that rival those of traditional, small-aperture photodiodes. We argue that any photocalibration project that relies on precise knowledge of the intensity of a large-diameter optical beam should consider using solar cells as calibrating photodetectors.
      Citation: Journal of Astronomical Instrumentation
      PubDate: 2022-02-07T08:00:00Z
      DOI: 10.1142/S2251171722500027
       
 
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