Effects of telescope secondary mirror spider on optical astronomical imaging

Other Title(s)

تأثيرات عنكبوت المرأة الثانوية للتلسكوب على التصوير الفلكي البصري

Dissertant

Yusuf, Ammar Faruq

Thesis advisor

Talib, Ali

University

University of Baghdad

Faculty

College of Science

Department

Astronomy and Space Department

University Country

Iraq

Degree

Master

Degree Date

2006

English Abstract

The spiders hold the secondary mirror and control the mirror from vibrations, and also allow the mirror to be tilled.

The diffraction of spiders introduce spikes in the image of the point spread function (PSF).

The literatures have not covering this area very well and there are very few papers concerning imaging with spider apertures.

The work in this thesis demonstrate the effects of these spiders on the actual images of optical astronomical telescope.

First the effects of spider diffraction are studied in terms of imaging a point source.

This involves the Strehl ratio, FWHM of the PSF, the fractional encircled energy, and the MTF.

The study is also extended to examine these effects on the power spectrum of binary stars.

The results show that using curved spiders, no significant effects occur to the diffraction pattern of the aperture.

Finally it should be pointed out here that all the simulations and the results are carried out with MATLAB v7.1

Main Subjects

Astronomy

No. of Pages

77

Table of Contents

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-603396