Conception of adaptive multimodular wide-field telescopes with super-large Fresnel number

Sergei A. Rodionov; Vladimir S. Korepanov; Dmitry N. Yeskov; Boris B. Bonshtedt; Vladimir V. Reznichenko

doi:10.1117/12.177271

9 June 1994 Conception of adaptive multimodular wide-field telescopes with super-large Fresnel number

Sergei A. Rodionov, Vladimir S. Korepanov, Dmitry N. Yeskov, Boris B. Bonshtedt, Vladimir V. Reznichenko

Proceedings Volume 2200, Amplitude and Intensity Spatial Interferometry II; (1994) https://doi.org/10.1117/12.177271
Event: 1994 Symposium on Astronomical Telescopes and Instrumentation for the 21st Century, 1994, Kailua, Kona, HI, United States

Abstract

Problems are considered referring to development of a large adaptive telescope consisting of individual modules with common image and synthesized aperture. The telescope capabilities are estimated by Fresnel number as product of aperture size by field dimensions divided by wavelength. It is shown that configurations based on `power' modules are most promising ones to provide superlarge values of Fresnel number rather than conventional configurations with afocal modules. Some problems are solved including image matching by using of the images curved surfaces having the common center and simultaneous slope of the modules towards the telescope center. Problem of phasing across the field is solved by introducing spherical aberration into pupils of the modules. A power grating interferometer configuration is suggested, too, usable as a sensor for the synthesized wavefront deformations just during observation of an extent source. As an example, a multimodule telescope configuration is proposed with Fresnel number of up to 5(DOT)10⁴.

Citation Download Citation

Sergei A. Rodionov, Vladimir S. Korepanov, Dmitry N. Yeskov, Boris B. Bonshtedt, and Vladimir V. Reznichenko "Conception of adaptive multimodular wide-field telescopes with super-large Fresnel number", Proc. SPIE 2200, Amplitude and Intensity Spatial Interferometry II, (9 June 1994); https://doi.org/10.1117/12.177271

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KEYWORDS

Space telescopes

Telescopes

Mirrors

Information operations

Interferometers

Optical spheres

Sensors

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