Fulltext

Study the effect of the conic on Cassegrain Telescopes

دراسة تأثير مقدار اللاتكورعلى التلسكوب الكاسكريني

مدلول العبيدي مدلول العبيدي --- Marwa Jawad AlـJuburi مروه جواد حزام الجبوري --- Raja Abdul-Ameer رجاء عبدالامير مدلول

Albahir journal مجلة الباهر
ISSN: 23125721 Year: 2015 Volume: 2 Issue: 3,4 Pages: 29-40
Publisher: AL-Abbas Holy Shrine العتبة العباسية المقدسة

Abstract

Abstract In this research study the effect of (conic) on some of the parameters that control the visual quality of the image formed by Cassegrain telescope for the purpose of evaluate the performance of this telescope that study Root Mean Square (RMS). The form of the distribution of the rays Encircled Energy (Enc) and A spherical Aberration is one of the most important factors affecting the composition of the image in the telescope and by which they can evaluate the work of the telescope. have been studying these parameters through the use of program Zemax where the results show that an decrease in conic lead to decrease A spherical Aberration in the image or visual system also leads at the same time to decrease the area of the bright spot (RMS). The Encircled Energy decrease with conic decrease this is evidence optical design quality for the case study of this topic telescope Cassegrain.

اﳋلاﺻة ( ﻋﲆ ﺑﻌﺾ ﺍﳌﻌﻠﲈﺕ ﺍﻟﺒﴫﻳﺔ ﺍﻟﺘﻲ ﺗﺘﺤﻜﻢ ﺑﺠﻮﺩﺓ ﺍﻟﺼﻮﺭﺓ conic)ﺗﻢ ﰲ ﻫﺬﺍ ﺍﻟﺒﺤﺚ ﺩﺭﺍﺳﺔ ﺗﺄﺛﲑ ﻣﻘﺪﺍﺭ ﺍﻟﻼﺗﻜﻮﺭ RMS)ﺍﳌﺘﻜﻮﻧﺔ ﺑﻮﺍﺳﻄﺔ ﺍﻟﺘﻠﺴﻜﻮﺏ ﺍﻟﻜﺎﺳﻜﺮﻳﻨﻲ ﻟﻐﺮﺽ ﺗﻘﻴﻢ ﺃﺩﺍﺀ ﻫﺬﺍ ﺍﻟﺘﻠﺴﻜﻮﺏ ﺇﻥ ﺩﺭﺍﺳﺔ ﻣﺴﺎﺣﺔ ﺍﻟﺒﻘﻌﺔ ﺍﳌﻀﻴﺌﺔ ( ﻭﺍﻟﺰﻳﻎ ﺍﻟﻜﺮﻭﻱ Encircled Energy Enc) ( ﻭﺷﻜﻞ ﺗﻮﺯﻳﻊ ﺍﻷﺷﻌﺔ ﻓﻴﻬﺎ ﻭﻛﻤﻴﺔ ﺍﻟﻄﺎﻗﺔ ﺍﳌﺘﺠﻤﻌﺔ Root Mean Square ( ﺗﻌﺘﱪ ﻣﻦ ﺃﻫﻢ ﺍﻟﻌﻮﺍﻣﻞ ﺍﳌﺆﺛﺮﺓ ﻋﲆ ﺗﻜﻮﻳﻦ ﺍﻟﺼﻮﺭﺓ ﰲ ﺇﻱ ﺗﻠﺴﻜﻮﺏ ﻭﺍﻟﺘﻲ ﻣﻦ ﺧﻼﳍﺎ A spherical Aberration) ﺣﻴﺚ ﺃﻇﻬﺮﺕ ﺍﻟﻨﺘﺎﺋﺞ Zemaxﻳﻤﻜﻦ ﺗﻘﻴﻴﻢ ﻋﻤﻞ ﺍﻟﺘﻠﺴﻜﻮﺏ .ﻟﻘﺪ ﺗﻢ ﺩﺭﺍﺳﺔ ﻫﺬﻩ ﺍﳌﻌﻠﲈﺕ ﻣﻦ ﺧﻼﻝ ﺍﺳﺘﺨﺪﺍﻡ ﺑﺮﻧﺎﻣﺞ ﺃﻥ ﻧﻘﺼﺎﻥ ﻣﻘﺪﺍﺭ ﺍﻟﻼﺗﻜﻮﺭ ﻳﺆﺩﻱ ﺇﱃ ﻧﻘﺼﺎﻥ ﺍﻟﺰﻳﻎ ﺍﻟﻜﺮﻭﻱ ﰲ ﺍﻟﺼﻮﺭﺓ )ﺃﻭ ﺍﳌﻨﻈﻮﻣﺔ ﺍﻟﺒﴫﻳﺔ(، ﻛﺬﻟﻚ ﻳﺆﺩﻱ ﰲ ﻧﻔﺲ (، ﻛﺬﻟﻚ ﺍﻟﻄﺎﻗﺔ ﺍﳌﺘﺠﻤﻌﺔ ﻓﺈﳖﺎ ﺗﻘﻞ ﻭﻫﺬﺍ ﺩﻟﻴﻞ ﺟﻮﺩﺓ ﺍﻟﺘﺼﻤﻴﻢ ﺍﻟﺒﴫﻱ RMS)ﺍﻟﻮﻗﺖ ﺇﱃ ﻧﻘﺼﺎﻥ ﻣﺴﺎﺣﺔ ﺍﻟﺒﻘﻌﺔ ﺍﳌﻀﻴﺌﺔ ﳍﺬﻩ ﺍﳊﺎﻟﺔ ﺍﳌﺪﺭﻭﺳﺔ ﻟﻠﺘﻠﺴﻜﻮﺏ ﺍﻟﻜﺎﺳﻜﺮﻳﻨﻲ.

Keywords

Cassegrain telescope، conic، A spherical Aberration، Zemax program --- ﺍﻟﺘﻠﺴﻜﻮﺏ ﺍﻟﻜﺎﺳﻜﺮﻳﻨﻲ، ﺍﻟﻼﺗﻜﻮﺭ، ﺍﻟﺰﻳﻎ ﺍﻟﻜﺮﻭﻱ، ﺑﺮﻧﺎﻣﺞ ﺯﻳﲈﻛﺲ