High-resolution image reconstruction technique applied to the optical testing of ground-based astronomical telescopes

Zhenyu Jin; Jing Lin; Zhong Liu

doi:10.1117/12.788655

10 July 2008 High-resolution image reconstruction technique applied to the optical testing of ground-based astronomical telescopes

Zhenyu Jin, Jing Lin, Zhong Liu

Author Affiliations +

Proceedings Volume 7012, Ground-based and Airborne Telescopes II; 70122U (2008) https://doi.org/10.1117/12.788655
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

By study of the classical testing techniques (such as Shack-Hartmann Wave-front Sensor) adopted in testing the aberration of ground-based astronomical optical telescopes, we bring forward two testing methods on the foundation of high-resolution image reconstruction technology. One is based on the averaged short-exposure OTF and the other is based on the Speckle Interferometric OTF by Antoine Labeyrie. Researches made by J.Ohtsubo, F. Roddier, Richard Barakat and J.-Y. ZHANG indicated that the SITF statistical results would be affected by the telescope optical aberrations, which means the SITF statistical results is a function of optical system aberration and the atmospheric Fried parameter (seeing). Telescope diffraction-limited information can be got through two statistics methods of abundant speckle images: by the first method, we can extract the low frequency information such as the full width at half maximum (FWHM) of the telescope PSF to estimate the optical quality; by the second method, we can get a more precise description of the telescope PSF with high frequency information. We will apply the two testing methods to the 2.4m optical telescope of the GMG Observatory, in china to validate their repeatability and correctness and compare the testing results with that of the Shack-Hartmann Wave-Front Sensor got. This part will be described in detail in our paper.

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Zhenyu Jin, Jing Lin, and Zhong Liu "High-resolution image reconstruction technique applied to the optical testing of ground-based astronomical telescopes", Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70122U (10 July 2008); https://doi.org/10.1117/12.788655

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KEYWORDS

Telescopes

Speckle

Optical transfer functions

Point spread functions

Image restoration

Image resolution

Error analysis

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