Design of 10× infrared zoom lens with all sphere surfaces
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摘要: 针对320240像素非制冷红外焦平面探测器，设计了一个工作波段为3.7 m~4.8 m的红外变焦光学系统。该系统由6片全球面透镜组成，采用硅和锗两种常见的红外材料，F数为2.5，后工作距为20 mm，可以实现15 mm~150 mm范围内连续变焦。设计评价结果表明：光学系统在探测器奈奎斯特频率16 lp/mm处，变焦范围内全视场MTF大于0.6， 0.7视场MTF接近0.7，整体接近衍射极限。焦平面探测器敏感元能量集中度大于70%，具有大相对孔径、长工作距、全球面的特点。在-20 ℃~60 ℃温度范围内，成像质量满足设计要求。Abstract: For the 320240 pixels uncooled infrared focal plane array(FPA) detector, a midinfrared zoom optical system was designed working at 3.7 m~4.8 m waveband.It contains 6 sphere lenses. All lens elements are made up of silicon and germanium materials which can transmit 3.7 m~4.8 m infrared rays. The F number is 2.5, the back working length is 20 mm, and it can realize 15 mm~150 mm continuous zoom. Designed results show that the modulation transfer function (MTF) value of zoom lens is greater than 0.6 at 16 lp/mm in the full field of view (FOV), and no less than 0.7 in the 0.7 FOV,which means near the diffraction limit generally. The uncooled infrared unit for plane arrays can catch more than 70% infrared rays energy. The lens system is characterized by small F number, long back work length and all spherical surfaces. And the image quality meets the requirements within -20 ℃~60 ℃.
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Keywords:
- optical design /
- zoom lens /
- infrared technology /
- uncooled infrared FPA detector
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