Near-infrared guiding and tip-tilt correction for the UC Berkeley Infrared Spatial Interferometer

Everett A. Lipman; Manfred Bester; William C. Danchi; Charles H. Townes

doi:10.1117/12.317160

24 July 1998 Near-infrared guiding and tip-tilt correction for the UC Berkeley Infrared Spatial Interferometer

Everett A. Lipman, Manfred Bester, William C. Danchi, Charles H. Townes

Proceedings Volume 3350, Astronomical Interferometry; (1998) https://doi.org/10.1117/12.317160
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

The UC Berkeley Infrared Spatial Interferometer (ISI) is a heterodyne stellar interferometer which operates in the mid-infrared between 9 and 12 microns. This wavelength range makes the ISI particularly well-suited to high resolution study of late-type stars and other objects surrounded by relatively cool dust, the emission from which peaks in the mid-infrared. Unfortunately, this same dust tends to reduce the amount of visible light available from the sources, making many interesting infrared objects too faint for the original telescope guiding system, which used a silicon CCD camera. This system has been replaced by a guiding and tip-tilt correction system based on an InSb IR camera and a fast, controllable tilting mount for one of the mirrors in the signal path. The new system has improved the quality of ISI fringe visibility data on bright sources and allowed the study of previously inaccessible objects.

Citation Download Citation

Everett A. Lipman, Manfred Bester, William C. Danchi, and Charles H. Townes "Near-infrared guiding and tip-tilt correction for the UC Berkeley Infrared Spatial Interferometer", Proc. SPIE 3350, Astronomical Interferometry, (24 July 1998); https://doi.org/10.1117/12.317160

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