Results 151 to 160 of about 4,978 (186)

Optical long-baseline interferometry in astronomy

SPIE Proceedings, 1990
Optical long-baseline interferometry can yield images and spectra with fascinating angular resolution. For example, at a wavelength of 500 nm and with a baseline of lOOm a resolution of 10 arcsec can be obtained. We have studied the dependence of the SNR in the reconstructed image on the diluted pupil function, on wavefront aberrations and on photon ...
Thorsten Reinheimer, Gerd Weigelt
openaire   +1 more source

Polarization considerations for long baseline interferometry

SPIE Proceedings, 2014
In building long baseline interferometers with many fold mirrors, the wavefront quality, reflectivity loss, and relative dispersion are not the only issues a designer must contend with. The polarization effects from fold mirrors on light can significantly reduce fringe visibility. However, recognizing a mirror’s polarization effects early can influence
Jason Mudge, Benjamin Johnson, Chad Ogden   +2 more
openaire   +1 more source

Very Long Baseline Interferometry

2018
This chapter describes the theory and the individual operational steps and components needed to carry out geodetic and astrometric Very Long Baseline Interferometry (VLBI) measurements. Pairs of radio telescopes are employed to observe far distant compact radio galaxies for the determination of the differences of the arrival times at the telescopes ...
openaire   +1 more source

Very Long Baseline Interferometry

1997
The practice of Very Long Baseline Interferometry (VLBI) has undergone a great deal of development since the first demonstrations of the technique in 1967. High quality images including spectroscopy and polarimetry are now routinely produced for a variety of high brightness radio sources.
openaire   +1 more source

Strehl ratio and visibility in long-baseline stellar interferometry

Optics Letters, 1995
The relationship between Strehl ratio (S), the parameter most often used by those in the adaptive optics field, and visibility (V), the parameter of most interest to those working in interferometry, is investigated. It is found that if the atmospheric turbulence is assumed to be Kolmogorov, V approximately S for high Strehl ratios. At low Strehl ratios,
T A, Brummelaar, W G, Bagnuolo, S T, Ridgway   +2 more
openaire   +2 more sources

Long-Baseline Interferometry

Science, 1972
A E, Rogers, P, Morrison
openaire   +2 more sources

Seven Be stars resolved by optical long-baseline interferometry

Symposium - International Astronomical Union, 1994
The recent progress in optical interferometry has made the direct study of the circumstellar matter around Be stars possible. The Hα emission region around γ Cas has been resolved with the I2T (Thom et al. 1986), GI2T (Mourard et al. 1989) and MkIII (Quirrenbach et al.
openaire   +1 more source

Space very long baseline interferometry in China

Advances in Space Research, 2020
Zhongli Zhang, Zhen-Ya Zheng, Tao An
exaly  

Very long baseline interferometry with the SKA

2014
Aerospace ...
Paragi, Z. (author), Godfrey, L. (author), Gurvits, L. (author), et al (author)   +3 more
openaire   +1 more source

III Optical Long Baseline Interferometry

2021
openaire   +2 more sources