Infrared speckle interferometer with a linear array detector

Details Infrared speckle interferometer with a linear array detector Infrared speckle interferometer with a linear array detector

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..432k&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 686, p. 432-436.

Astronomy and Astrophysics

Astronomy

1

Infrared Interferometers, Linear Arrays, Speckle Interferometry, Signal To Noise Ratios, Time Dependence

Scientific paper

We have developed a 1D near-IR speckle interferometer with a linear-array detector which can produce speckle images by means of a cylindrical lens. The detector with a Reticon multiplexer is operated at the kTC noise limit (approximately 2500 e-, rms). Using this instrument, we have obtained systematic data of the exposure time dependence of the modulation transfer function along with astronomical observations. The result indicates that the best exposure time of the speckle interferometry is longer than the exposure time chosen so that the fluctuations in the atmosphere are approximately frozen within an exposure. In the actual observations at the University of Hawaii 2.2-m telescope at Mauna Kea, the optimum exposure time is proved to be about 0.3 s.

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