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Optical Interferometry - Coggle Diagram
Optical Interferometry
Definition
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The profile is derived from the relative or absolute phase of the reflected light for each profile point.
In case of a relative phase measurement, a so-called phase unfolding algorithm is used to reconstruct the absolute phase.
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Optical interferometers are homodyne, meaning incoming radiation is interfered only with light from other telescope. This requires transport of the light to a central station, without the benefit of being able to amplify the signal. However, homodyne interferometry allows large bandwidths to be used since the interfered light is detected directly.
One heterodyne optical interferometer (ISI) has been built to operate at 10 microns. The technique is feasible, but limited to bright sources.)
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Types of interferometer
Image-Plane
Imaging interferometry is more typically implemented on a common-mount interferometer . An imaging interferometer can be designed to create high resolution images over a wide field of view.
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Pupil-Plane
Pupil-plane interferometry is used in long-baseline interferometry.
Bracewell (1978) first suggested using this technique to null a stellar point source for detection of planets.
- An image of the object is formed with a resolution of λ/D.
- Visibility is measured by scanning the interferometer in pathlength.
- The flux seen in the image is the object flux multiplied by the transmission pattern, and convolved with the single aperture PSF.
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