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利用折/衍混合透镜实现了超宽温度范围内的光学被动式消热差设计,系统工作波段为8～12μm,全视场角为9.15°,焦距为100 mm,相对孔径为1/1.5,总长为128 mm,后工作距为10.5 mm。使用了锗和硒化锌两种材料,采用三片透镜,衍射面和偶次非球面的引入,不但能够消除热差,而且使得结构简单、轻量化,很好地提高了成像质量。设计结果表明:在-80～160℃温度范围内,空间频率为12.5 lp/mm处,各个温度下的MTF值均大于0.6,接近于衍射极限,成像质量良好,实现了消热差设计。该系统适用于像元尺寸为40μm,像元数为320×240的非制冷红外焦平面阵列探测器。
The design of optical passive thermal aberration in ultra-wide temperature range is realized by using the folding / diffractive hybrid lens. The system has a working wavelength range of 8 to 12 μm, a full field angle of 9.15 °, a focal length of 100 mm and a relative aperture of 1 / 1.5. The total length 128 mm, the working distance is 10.5 mm. The use of germanium and zinc selenide two materials, the introduction of three lenses, diffractive surface and even aspheric, not only to eliminate heat, but also makes the structure simple, lightweight, and well improve the imaging quality. The design results show that the MTF values at all temperatures are higher than 0.6 at a spatial frequency of 12.5 lp / mm in the temperature range of -80 ~ 160 ℃, close to the diffraction limit, and the imaging quality is good. The system is suitable for uncooled infrared focal plane array detectors with cell size of 40μm and pixel count of 320 × 240.