Results 71 to 80 of about 348,356 (178)
Quantum limits of parameter estimation in long-baseline imaging
Physical Review ResearchTelescope systems with distributed apertures are a well-established approach for boosting resolution in astronomical imaging. However, theoretical limits on quantitative imaging precision, and the fundamentally best possible mode-sorting, beam-combining,
Aqil Sajjad +2 more
doaj +1 more source
Accuracy Estimation of Astronomical Constants from Long Baseline Interferometer Observations [PDF]
Symposium - International Astronomical Union, 1974 Inherent in Very Long Baseline Interferometry (VLBI) is the potentiality of determining relative angular positions of radio sources to an accuracy which is superior to present methods by at least one order of magnitude. For VLBI observations such as time delay, fringe frequency and fringe phase the sensitivity to the uncertainties of astronomical ...
openaire +1 more source
Turbulence characterisation for Astronomical Observatories [PDF]
, 2012 Atmospheric turbulence has two effects in astronomy; (i) the broadening of the point spread function due to phase fluctuations limiting the resolution of imaging and (ii) producing intensity fluctuations known as scintillation.
SHEPHERD, HARRY,WILLIAM +1 more
core
Full-field optical coherence tomography [PDF]
, 2005 To eliminate mechanical scanning in the probe head of an endoscopic OCT system, we propose the use of an imaging fibre bundle for probe beam delivery.
H. D. Ford +3 more
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Subarray Processing for Projection-based RFI Mitigation in Radio Astronomical Interferometers
The Astronomical Journal, 2018 Abstract Radio Frequency Interference (RFI) is a major problem for observations in Radio Astronomy (RA). Adaptive spatial filtering techniques such as subspace projection are promising candidates for RFI mitigation; however, for radio interferometric imaging arrays, these have primarily been used in engineering demonstration experiments ...
Mitchell C. Burnett +3 more
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Optics Express, 2011 This paper demonstrates the use of a nonlinear upconversion process to observe an infrared source through a telescope array detecting the interferometric signal in the visible domain. We experimentally demonstrate the possibility to retrieve information on the phase of the object spectrum of an infrared source by using a three-arm upconversion ...
Ceus, Damien +6 more
openaire +3 more sources
VST processing facility: first astronomical applications [PDF]
VST–Tube is a new software package designed to process optical astronomical images. It is an automated pipeline to go from the raw exposures to fully calibrated co-added images, and to extract catalogs with aperture and PSF photometry.
Capaccioli, Massimo
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Liquid-helium-cooled Michelson interferometer [PDF]
, 1972 Interferometer serves as a rocket-flight spectrometer for examination of the far infrared emission spectra of astronomical objects. The double beam interferometer is readily adapted to make spectral scans and for use as a detector of discrete line ...
Augason, G. C., Young, N.
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Bispectral technique for reconstruction the astronomical images with an intensity interferometer
, 2008 An extension may be proposed to the intensity interferometer of Hanbury Brown and Twiss to provide the Fourier phase measurement by the use of third-order intensity correlations. It is well known that interferometric reconstruction of astronomical images can be obtained from second-order correlations only when a priory information is used about the ...
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Design and Development of an Optical Chip Interferometer For High Precision On-Line Surface Measurement [PDF]
Advances in manufacturing and with the demand of achieving faster throughput at a lower cost in any industrial setting have put forward the need for embedded metrology.
Kumar, Prashant
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