1 April 1997 Polarization effects in aperture synthesis arrays
Author Affiliations +
Optical Engineering, 36(4), (1997). doi:10.1117/1.601143
Abstract
We describe the visibility function in polarized light for a cophased N-aperture synthesis array made of ground-based optical telescopes. Instrumental polarization induces attenuations depending on both the differential field rotations and the phase delays from incoming beams, whereas the combination of N beams leads to a power transmission divided by N in the modulation transfer function. For asymmetrical arrays, we optimize two compensators for field rotation: three-reflection optics in rotation around the optical axis of each interferometric arm and a pyramidal beam-combiner similar to a very large Cassegrain telescope. These correctors are equivalent in terms of visibility losses so that trade-offs must be found between mechanical requirements and SNR. Finally, the separation of the two polarizations before recording the fringes is very attractive for future interferometric projects since it greatly reduces the data bias and also provides visibilities in polarized light and therefore new constraints on polarization mechanisms in stellar atmospheres
Karine Perraut-Rousselet, Denis Mourard, Farrokh Vakili, "Polarization effects in aperture synthesis arrays," Optical Engineering 36(4), (1 April 1997). http://dx.doi.org/10.1117/1.601143
JOURNAL ARTICLE
8 PAGES


SHARE
KEYWORDS
Signal attenuation

Visibility

Polarization

Mirrors

Synthetic apertures

Telescopes

Interferometry

RELATED CONTENT

Progress in air-coupled ultrasound
Proceedings of SPIE (April 19 2007)
Polarimetric lidar returns in the ocean a Monte...
Proceedings of SPIE (February 06 1997)
Status Of Fiber-Optic Sensing
Proceedings of SPIE (November 14 1988)
Multimedia application performance on a WiMAX network
Proceedings of SPIE (January 19 2009)

Back to Top