【摘要】：滾仰式紅外光學系統(tǒng)由物鏡前組、折轉鏡組和成像后組組成,其平臺內框架俯仰范圍可達到±90°,外框架可以實現(xiàn)360°滾轉,使光學系統(tǒng)觀察視場覆蓋整個前半球。光學系統(tǒng)實現(xiàn)了100%冷光闌效率。為適應較大的工作環(huán)境溫度變化,對光學系統(tǒng)開展了被動無熱化設計,給出了被動無熱化實現(xiàn)的計算公式,并利用"虛擬色差"技術,快速確定了滿足無熱化條件的光學系統(tǒng)最優(yōu)初始解。針對制冷型紅外光學系統(tǒng)的"冷反射"效應,給出了冷反射誘導溫差(NITD)的計算公式,并對敏感表面進行了優(yōu)化控制。設計結果表明,光學系統(tǒng)焦距為58 mm,視場大小為4.0°,F數(shù)為2.0,在-50~60℃工作溫度范圍內系統(tǒng)MTF值接近衍射極限,并對"冷反射"效應具有較好的抑制能力。經(jīng)樣機測試,光學系統(tǒng)成像清晰穩(wěn)定,性能良好,滿足設計及使用要求。
[Abstract]:The rolling infrared optical system is composed of the objective lens front group, the refractive mirror group and the post-imaging group. The pitch range of the frame in the platform can reach 鹵90 擄, and the outer frame can roll 360 擄, so that the optical system observation field of view covers the whole front hemisphere. The optical system achieves an efficiency of 100% cold aperture. In order to adapt to the large temperature change in the working environment, the passive non-thermal design of optical system is carried out, and the calculation formula of passive non-heating is given, and the "virtual color difference" technique is used. The optimal initial solution of the optical system satisfying the non-thermal condition is determined quickly. In view of the "cold reflection" effect of the refrigeration infrared optical system, the formula of the cold reflection-induced temperature difference (NITD) is given, and the optimal control of the sensitive surface is carried out. The design results show that the focal length of the optical system is 58 mm, the field of view is 4.0 擄and the F number is 2.0. The MTF value of the optical system is close to the diffraction limit in the working temperature range of -50 ~ 60 鈩，

本文編號：2300060