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Proceedings Paper

Long-baseline interferometer for the mid-infrared
Author(s): Manfred Bester; William C. Danchi; Charles H. Townes
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Paper Abstract

The Infrared Spatial Interferometer (ISI) is a high-resolution aperture synthesis imaging system for the 10-micron region. As in many radio interferometers, heterodyne signal detection and lobe rotation for fringe tracking are employed. A Helium-Neon laser metrology system is used for monitoring critical distances within the telescope optics. Although designed for baselines up to 1000 m, initially the interferometer will have baselines ranging from 4 to 34 m, yielding angular resolutions as fine as 0.030 arcsec. First fringes were detected in June 1988. Since then the system has been successfully operated on 4 m and 13 m baselines.

Paper Details

Date Published: 1 August 1990
PDF: 9 pages
Proc. SPIE 1237, Amplitude and Intensity Spatial Interferometry, (1 August 1990); doi: 10.1117/12.19343
Show Author Affiliations
Manfred Bester, Univ. of California/Berkeley (United States)
William C. Danchi, Univ. of California/Berkeley (United States)
Charles H. Townes, Univ. of California/Berkeley (United States)


Published in SPIE Proceedings Vol. 1237:
Amplitude and Intensity Spatial Interferometry
James B. Breckinridge, Editor(s)

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