Design of Long-wavelength Infrared Athermalization Lens with Large Relative Aperture for Large-array Detectors
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摘要: 随着红外探测器技术不断发展和进步，长波红外成像向大相对孔径和大面阵发展。本文设计了一款用于1024×768@12 μm大面阵，F/#＝0.8的大相对孔径长波红外镜头。基于不同红外材料的温度特性以及光学被动消热差理论，此镜头采用3种红外材料组合设计和四面非球面矫正像差设计，满足了各视场的点列图及MTF曲线在－40℃~60℃温度范围内变化不大的无热化要求。该镜头具有光通量高、结构紧凑、工艺性较佳等优点。可用于车载辅助驾驶仪、机载吊舱等领域的态势感知。Abstract: With the advancements in infrared detector technology, long-wavelength infrared imaging lenses having a large relative aperture and large-array are being fabricated. In this study, a long-wavelength infrared athermalized lens with a large relative aperture (F/#=0.8) was designed for a large-array detector (1024 × 68@12 μm). Based on the temperature characteristics of different infrared materials and the theory of optical passive athermalization, the lens has a combination design of three infrared materials and an aberration correction design of four aspherical surfaces. The system is developed such that the spot diagram and modulation transfer function curve of every field of view have only small changes in the temperature range of −40–60℃, thus satisfying the optical non-heating design requirement. The lens has the advantages of a high luminous flux, compact structure, and good manufacturability. It can be used in driver assistance systems and aircraft pods for situation awareness.
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Keywords:
- athermalization /
- large-array /
- large relative aperture /
- long-wavelength /
- optical design
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表 1 常见长波红外材料参数
Table 1 Common long-wavelength infrared material parameters
Material Refractive index at 10 μm Abbe number 8~12 μm dn/dT at 10 μm and 20℃/(10-6/℃) CTE αg/(10-6/℃) Germanium 4.0028 834 408 6.1 Gasir-1 2.4944 120 49.7 17 Gasir-3 2.6105 115 53 17 Amtir-1 2.5109 113 70.5 12 Amtir-2 2.6027 110 47.2 13.5 IG2 2.4944 119 61 12.1 IG5 2.6033 108 70 14 IG6 2.7781 159 41 20.7 ZnS_IR 2.1920 23 41 6.6 ZnSe 2.4028 52 61 7.1 
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表 2 光学设计参数
Table 2 Parameters of optical system parameters
Wavelength range/μm 8 to 12 (Central wave 10 μm) Efficient focal length/mm 16.8 F/# 0.8 Field of view 40°×30° Image size(diagonal)/mm 7.68 mm Temperature range/℃ −40 to 60 Classification of athermalization Optical passive
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表 3 不同温度下的像面离焦量
Table 3 Image defocus at different temperatures
Temperature/℃ 20 −40 60 Focus shift/μm 6 11 9
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表 4 系统在不同温度下的MTF@42 lp/mm
Table 4 MTF of system at 42 lp/mm at different temperatures
Temperature 20℃ -40℃ 60℃ 0 Field MTF 0.500 0.513 0.474 0.7 Field MTF Tangential 0.456 0.429 0.349 Sagittal 0.374 0.248 0.440 1.0 Field MTF Tangential 0.284 0.158 0.219 Sagittal 0.373 0.104 0.458
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表 5 系统在不同温度下的弥散斑RMS半径
Table 5 RMS radius of system spot diagrams at different temperatures
Temperature/℃ Field RMS spot radius/μm 20 0 4.242 0.5 5.203 0.7 6.600 1.0 10.947 -40 0 4.187 0.5 5.086 0.7 9.246 1.0 15.206 60 0 6.151 0.5 11.314 0.7 10.560 1.0 12.101
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