Applications of Interferometry

  • Swapan Kumar Saha
Part of the Astronomy and Astrophysics Library book series (AAL)


In astronomy, interferometry can be traced back to 1868 when Fizeau (1867) proposed to the Académie des Sciences that this technique could be used to measure stellar diameters. This scheme consists of installing a mask with two small openings (apertures) separated in distance at the entrance of a telescope. When pointing at a star, the superposition of the two images in the focal plane, where both beams intersect, creates interference fringe (classical Young’s fringes) across the combined image, and thereby measuring the fringe visibility as a function of aperture separation. He realized that a relationship exists between the aspect of interference fringes and the angular diameter of the light source, in this case a star.


Gravitational Wave Brightness Temperature Radio Source Very Long Baseline Interferometry Radio Telescope 
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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Indian Institute of AstrophysicsBangaloreIndia

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