scholarly journals High Resolution Imaging Forty Years Ago

1994 ◽  
Vol 158 ◽  
pp. 337-341
Author(s):  
R. C. Jennison
Keyword(s):  
High Resolution ◽  
Point Sources ◽  
Resolving Power ◽  
High Angular Resolution ◽  
Electromagnetic Spectrum ◽  
High Resolution Imaging ◽  
Resolution Imaging ◽  
Optical Telescopes ◽  
Very High ◽  
Better Than

This conference is concerned with the very high resolution imaging of cosmic sources in many parts of the electromagnetic spectrum. Various techniques are now available and the equipment is often automated and highly sophisticated but the term ‘very high angular resolution’ is comparative. Many of the problems existed over forty years ago when the best resolving power was about half a degree and the two major radio ‘stars’ appeared to be point sources. Very high resolution imaging in those days was the struggle to reach one minute of arc and Hanbury Brown had set his sights on considerably better than one second of arc with the concept of the intensity interferometer. The dream was to achieve a resolving power comparable to that of optical telescopes.

scholarly journals Introduction to the Joint Commission Meeting on High Resolution Imaging from the Ground

1989 ◽  
Vol 8 ◽  
pp. 545-546
Author(s):  
John Davis
Keyword(s):  
High Resolution ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
High Resolution Imaging ◽  
Wide Range ◽  
High Resolution Images ◽  
Resolution Imaging ◽  
Optical Wavelengths ◽  
To Come ◽  
Very High

As a result of advances in instrumentation and techniques, from radio through to optical wavelengths, we have before us the prospect of producing very high resolution images of a wide range of objects across this entire spectral range. This prospect, and the new knowledge and discoveries that may be anticipated from it, lie behind an upsurge in interest in high resolution imaging from the ground. Several new high angular resolution instruments for radio, infrared, and optical wavelengths are expected to come into operation before the 1991 IAU General Assembly.

scholarly journals Measuring Curved Crystal Performance for a High-Resolution, Imaging X-Ray Spectrometer

2010 ◽  
Vol 2010 ◽  
pp. 1-10 ◽  
Author(s):  
Michael J. Haugh ◽  
Richard Stewart
Keyword(s):  
High Resolution ◽  
Resolving Power ◽  
Inertial Confinement ◽  
High Resolution Imaging ◽  
Doppler Broadening ◽  
X Ray Diffraction ◽  
High Quality ◽  
Reflectivity Curve ◽  
X Ray ◽  
Resolution Imaging

This paper describes the design, crystal selection, and crystal testing for a vertical Johann spectrometer operating in the 13 keV range to measure ion Doppler broadening in inertial confinement plasmas. The spectrometer is designed to use thin, curved, mica crystals to achieve a resolving power of E/ΔE>2000. A number of natural mica crystals were screened for flatness and X-ray diffraction width to find samples of sufficient perfection for use in the instrument. Procedures to select and mount high quality mica samples are discussed. A diode-type X-ray source coupled to a dual goniometer arrangement was used to measure the crystal reflectivity curve. A procedure was developed for evaluating the goniometer performance using a set of diffraction grade Si crystals. This goniometer system was invaluable for identifying the best original crystals for further use and developing the techniques to select satisfactory curved crystals for the spectrometer.

scholarly journals Evolution of INO Uncooled Infrared Cameras Towards Very High Resolution Imaging

2011 ◽  
Vol 276 ◽  
pp. 012114 ◽  
Author(s):  
Alain Bergeron ◽  
Hubert Jerominek ◽  
Claude Chevalier ◽  
Loïc Le Noc ◽  
Bruno Tremblay ◽  
...  
Keyword(s):  
High Resolution ◽  
High Resolution Imaging ◽  
Resolution Imaging ◽  
Infrared Cameras ◽  
Very High

scholarly journals Design of Neutron Microscopes Equipped with Wolter Mirror Condenser and Objective Optics for High-Fidelity Imaging and Beam Transport

2020 ◽  
Vol 6 (10) ◽  
pp. 100 ◽  
Author(s):  
Muhammad Abir ◽  
Daniel S. Hussey ◽  
Boris Khaykovich
Keyword(s):  
High Resolution ◽  
Spatial Resolution ◽  
Neutron Imaging ◽  
High Fidelity ◽  
Signal Rate ◽  
Pinhole Imaging ◽  
Standard Neutron ◽  
Resolution Imaging ◽  
Very High ◽  
Better Than

We present and compare the designs of three types of neutron microscopes for high-resolution neutron imaging. Like optical microscopes, and unlike standard neutron imaging instruments, these microscopes have both condenser and image-forming objective optics. The optics are glancing-incidence axisymmetric mirrors and therefore suitable for polychromatic neutron beams. The mirrors are designed to provide a magnification of 10 to achieve a spatial resolution of better than 10 μm. The resolution of the microscopes is determined by the mirrors rather than by the L/Dratio as in conventional pinhole imaging, leading to possible dramatic improvements in the signal rate. We predict the increase in the signal rate by at least two orders of magnitude for very high-resolution imaging, which is always flux limited. Furthermore, in contrast to pinhole imaging, in the microscope, the samples are placed far from the detector to allow for a bulky sample environment without sacrificing spatial resolution.

Very high resolution imaging scheme with multiple different-aperture cameras

1993 ◽  
Vol 5 (5-6) ◽  
pp. 511-526 ◽  
Author(s):  
Takashi Komatsu ◽  
Toru Igarashi ◽  
Kiyoharu Aizawa ◽  
Takahiro Saito
Keyword(s):  
High Resolution ◽  
High Resolution Imaging ◽  
Resolution Imaging ◽  
Very High

scholarly journals Proposal for the Implementation of the ALOHA Up-Conversion Interferometer on the CHARA Telescope Array

2014 ◽  
Vol 03 (03n04) ◽  
pp. 1450008 ◽  
Author(s):  
J. T. Gomes ◽  
L. Grossard ◽  
R. Baudoin ◽  
L. Delage ◽  
F. Reynaud ◽  
...  
Keyword(s):  
High Resolution ◽  
Infrared Radiation ◽  
Angular Resolution ◽  
Spectral Band ◽  
High Angular Resolution ◽  
High Resolution Imaging ◽  
Optical Components ◽  
Telescope Array ◽  
Sum Frequency ◽  
Resolution Imaging

In this paper, we present a new concept of instrument for high resolution imaging in astronomy, involving the sum frequency generation in non-linear waveguides. The aim is to convert the infrared radiation emitted by an astronomical source to the visible spectral domain where the optical components are mature and efficient. We present the main experimental results obtained in laboratory, and propose a new design for this instrument for its implementation on the Center for High Angular Resolution Astronomy (CHARA) telescope array. Preliminary stability and photometric results obtained at CHARA are presented. Using these last measurements, we estimate the limiting magnitudes which could be reached by this interferometer in the H spectral band.

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