NASA NTRS · 19750032390
10-micron heterodyne stellar interferometer
Abstract
A spatial interferometer for 10-micron wavelength which uses two independent telescopes separated by 5.5 m, heterodyne detection of the infrared radiation, and path equalization by a variable-length RF cable, has given interference fringes from radiation of the planet Mercury. Continuous fringe observations during 4000 sec indicate remarkable stability in the optical-path difference through the atmosphere and the two telescopes, fluctuations between 20-sec averages being about 1/6 of the 10-micron wavelength.
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Johnson, M. A., Betz, A. L., Townes, C. H.. 1974-12-30. 10-micron heterodyne stellar interferometer. https://ntrs.nasa.gov/citations/19750032390
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