Physics – Optics
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976josa...66.1247b&link_type=abstract
Optical Society of America, Journal, vol. 66, Nov. 1976, p. 1247-1251. Research supported by the Science Research Council.
Physics
Optics
15
Angular Resolution, Binary Stars, Interferometry, Optical Data Processing, Speckle Patterns, Telescopes, Astronomical Photography, Cassegrain Optics, Digital Techniques, Electromagnetic Interference, Fourier Transformation, Image Intensifiers, Light Scattering, Optical Transfer Function
Scientific paper
A speckle interferometer for use at the Cassegrain focus of large telescopes has been constructed and used to observe a binary star systems on the 2.5 m Isaac Newton telescope in England. The instrument has a four-stage, magnetically focused EMI image intensifier with a maximum light gain in excess of 10 to the 6th, good resolution, and low background noise. The final images are recorded on 16 mm cine film. Both analog optical and digital analyses have been carried out. The digital analysis enables the transfer function of the speckle method to be found and divided into the image power spectrum. Binary star separations have been measured for stars as close as 0.1 arcsec and as faint as magnitude 6.
Beddoes D. R.
Dainty Christopher J.
Morgan Brian L.
Scaddan Richard J.
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