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Infrared Long Baseline Interferometry

Published online by Cambridge University Press:  14 August 2015

W.C. Danchi ,
M. Bester ,
P.R. McCullough  and
C.H. Townes
W.C. Danchi
Affiliation:
Space Sciences Laboratory, Physics and Astronomy Deptartments, University of California at BerkeleyBerkeley, CA 94720, U.S.A.
M. Bester
Affiliation:
Space Sciences Laboratory, Physics and Astronomy Deptartments, University of California at BerkeleyBerkeley, CA 94720, U.S.A.
P.R. McCullough
Affiliation:
Space Sciences Laboratory, Physics and Astronomy Deptartments, University of California at BerkeleyBerkeley, CA 94720, U.S.A.
C.H. Townes
Affiliation:
Space Sciences Laboratory, Physics and Astronomy Deptartments, University of California at BerkeleyBerkeley, CA 94720, U.S.A.

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During the last few years, two new instruments using long baseline interferometry have been constructed for high angular resolution astronomy in the mid-infrared spectral region (8-12 μxm). One called SOIRDETE-Synthese d’Overture en InfraRouge a DEux TElescopes-was built by J. Gay and his collaborators at CERGA. SOIRDETE has a fixed E-W 15 m baseline and two 1 m diameter telescopes of conventional design. This instrument obtains interference fringes by adjusting an optical-precision delay line in discrete steps to compensate for the geometrical delay of the projected baseline. The interference fringe from the source is detected using HgCdTe photodiodes. Because the instrumental delay has discrete steps a time-domain interferogram is created. This interferogram, upon Fourier transformation to the frequency domain, yields information about the spectral characteristics of the source. First fringes have recently been obtained with this instrument (Gay, 1988).

Type
Joint Commission Meeting
Information
Highlights of Astronomy , Volume 8: Highlights of Astronomy. As presented at the XXth General Assembly of the IAU, 1988 , 1989 , pp. 563 - 564
Copyright
Copyright © Kluwer 1989

References

Danchi, W.C., Arthur, A., Fulton, R., Peck, M., Sutton, E.C., Townes, C.H. and Weitzmann, R.H., 1986, Proc. of the SPIE Conference on Advanced Technology Optical Telescopes III, 628, 422.CrossRefGoogle Scholar
Danchi, W.C., Bester, M. and Townes, C.H., 1988, Proc. of the NOAO/ESO Conference on High Resolution Imaging by Interferometry, Ed. Merkle, F., Garching, FRG.Google Scholar
Gay, J., 1988, private communication.Google Scholar
Townes, C.H., 1984, Astrophys. and Astron., 5, 111.CrossRefGoogle Scholar
Townes, C.H., Danchi, W.C., Sadoulet, B. and Sutton, E.C., 1986, Proc. of the SPIE Conference on Advanced Technology Optical Telescopes III, 628, 281.CrossRefGoogle Scholar