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Proceedings Paper • Open Access

Infrared Spatial Interferometer
Author(s): Charles H. Townes; Manfred Bester; William C. Danchi; David D. Snyder Hale; John D. Monnier; Everett A. Lipman; Peter G. Tuthill; Mark A. Johnson; Donald L. Walters

Paper Abstract

The Infrared Spatial Interferometer (ISI) is an interferometer installed on Mt. Wilson and operating in the 10 μm wavelength region, using heterodyne detection and two movable 1.65 m telescopes. Its general technology and characteristics, recent changes, and observational results are broadly discussed. Some compensation for atmospheric path length fluctuations is demonstrated. Stellar observations show, among other characteristics, that many stars emit gas and dust episodically with times of 10-100 years between events, and that stellar diameters measured in the mid-infrared region are about 10 percent larger than those measured with interferometry using visible light.

Paper Details

Date Published: 24 July 1998
PDF: 25 pages
Proc. SPIE 3350, Astronomical Interferometry, (24 July 1998); doi: 10.1117/12.317159
Show Author Affiliations
Charles H. Townes, Univ. of California/Berkeley (United States)
Manfred Bester, Univ. of California/Berkeley (United States)
William C. Danchi, Univ. of California/Berkeley (United States)
David D. Snyder Hale, Univ. of California/Berkeley (United States)
John D. Monnier, Univ. of California/Berkeley (United States)
Everett A. Lipman, Univ. of California/Berkeley (United States)
Peter G. Tuthill, Univ. of California/Berkeley (United States)
Mark A. Johnson, Lawrence Livermore National Lab. (United States)
Donald L. Walters, Naval Postgraduate School (United States)

Published in SPIE Proceedings Vol. 3350:
Astronomical Interferometry
Robert D. Reasenberg, Editor(s)

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