求大神幫忙修改摘要  本科畢業(yè)論文 A^EE32kbm  
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摘要 :7?FF'u  
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望遠(yuǎn)鏡是一種利用透鏡或反射鏡以及其他光學(xué)器件觀測(cè)遙遠(yuǎn)物體的光學(xué)儀器，在軍事、天文、地質(zhì)等方面有著非常廣泛的應(yīng)用�？ㄈ�格林光學(xué)系統(tǒng)有體積小、重量輕、結(jié)構(gòu)緊湊等特點(diǎn)；紅外光學(xué)系統(tǒng)有著不受晝夜限制、穿透煙霧能力強(qiáng)等優(yōu)點(diǎn)；二者結(jié)合不僅可以縮小整個(gè)望遠(yuǎn)系統(tǒng)的體積和重量，還可以減少一些外部因素對(duì)光學(xué)系統(tǒng)的影響。因而設(shè)計(jì)一款紅外卡塞格林望遠(yuǎn)物鏡具有極高的研究?jī)r(jià)值及應(yīng)用前景。 j;iAD:nf  
本文根據(jù)對(duì)視場(chǎng)、相對(duì)孔徑和焦距的要求選取了雙反射卡塞格林系統(tǒng)為初始結(jié)構(gòu)，依據(jù)光學(xué)系統(tǒng)優(yōu)化理論，對(duì)初始結(jié)構(gòu)進(jìn)行像差分析和優(yōu)化設(shè)計(jì)。最終，設(shè)計(jì)了工作波段在3.8~4.2范圍內(nèi)，焦距為850，全視場(chǎng)為，主鏡口徑為200的紅外卡塞格林望遠(yuǎn)物鏡。其傳遞函數(shù)在空間頻率21時(shí)大于0.45，滿足設(shè)計(jì)要求。 =-lb)Z"d  
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關(guān)鍵詞：紅外光學(xué)系統(tǒng)；卡塞格林；像質(zhì)評(píng)價(jià) c+nq] xOs'  
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Abstract M8b;d}XL  
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Telescope is an optical instrument that uses lenses or mirrors or other optical devices to observe distant objects. It has a wide range of applications at military, astronomy, geology, and so on.The characteristics of the Cassegrain optical system is of small size, light weight and compact structure;The infrared optical system has the advantages that is no limit of day and night and has ability to through smoke ; the combination of the two can not only reduce the volume and weight of the telescope, but also can reduce the influence of external factors of the optical system. The design of an infrared Cassegrain telescope has high research value and application prospect. ^vO+
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This thesis selects the double reflective Cassegrain system as the initial structure based on the requirements for field of view, relative aperture and focal lengththe. Analysised the aberration and optimized of the initial structure based on optical system optimization theory. Eventually,we designed an infrared Cassegrain telescope objective of a band for 3.8~4.2,the focal length is 850,the full field of view is ,the primary mirror aperture is 200. Its’ transfer function at 21 is greater than 0.45 at the spatial frequency,which meets the design requirements. Yv!a88+A8M  
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Key words: infrared optical system; Cassegrain; image evaluation

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