Optical System of Compact Thermal Imager for Near and Far Distances for Armed Police
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摘要: 本文设计了一种可以兼顾远近距离的紧凑型武警用红外热像仪光学系统,给出了一个设计实例,系统工作波段为8~12 μm,中心波长为10 μm,长焦距为150 mm,短焦距为50 mm,F数为1.1,可匹配像元数为384×288、像元大小为17 μm×17 μm的非制冷红外焦平面探测器。系统通过变倍组的轴向移动实现变焦,通过引入二元光学面和非球面减小成像系统体积,减轻重量,提高成像质量,设计结果表明,该热成像系统取得了良好的成像,可用于火灾消防救援、森林防火、夜间侦查、边防监控等工作。Abstract: A compact thermal imaging system, operating over both near and far distances, for armed police is introduced. A design example is proposed. The working band is 8–12 μm, the center wavelength is 10 μm, the long focal length is 150 mm, the short focal length is 50 mm, and the F number is 1.1. The system can match the performance of an uncooled focal plane infrared detector with a pixel number of 384×288 and a pixel size of 17 μm×17 μm. The system realizes zooming by the axial movement of the zoom group. By using binary optical surface and aspheric surface, the volume and mass of the imaging system are reduced, and the image quality is improved. The design results show that the thermal imaging system has appropriate image quality, which is suitable for fire rescue, fire prevention, night detection, and border monitoring.
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Key words:
- optical design /
- infrared imaging system /
- compact /
- uncooled focal plane /
- binary optics
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表 1 光学设计指标
Table 1. Parameters of optical design
Working band 8-12μm Central wavelength 10μm F# 1.1 Short focal length 50 mm Long focal length 150 mm Distortion 5% -
[1] Allen Mann. Infrared zoom lenses in the 1990s[J]. Opt. Eng., 1994, 33(1): 109-115. doi: 10.1117/12.151530 [2] Akram M N. A step-zoom dual field-of-view IR telescope[C]//Proc. of SPIE, 2002, 4832: 328-333. [3] 陈吕吉, 陈津津, 李萍.新型变焦双视场长波红外光学系统设计[J].红外技术, 2011, 33(7): 406-410. doi: 10.3969/j.issn.1001-8891.2011.07.007CHEN Lvji, CHEN Jinjin, LI Ping. A novel step-zoom LW infrared dual field-of-view optical system design[J]. Infrared Technology, 2011, 33(7): 406-410. doi: 10.3969/j.issn.1001-8891.2011.07.007 [4] 白玉琢, 李茂忠, 张莹昭, 等.紧凑型长波致冷型红外变焦距透镜系统[J].红外技术, 2011, 33(8): 453-456. doi: 10.3969/j.issn.1001-8891.2011.08.005BAI Yuzhuo, LI Maozhong, ZHANG Yinzhao. Compact long-wave infrared cooled zoom lens system[J]. Infrared Technology, 2011, 33(8): 453-456. doi: 10.3969/j.issn.1001-8891.2011.08.005 [5] 吕银环, 雷存栋, 崔维鑫, 等.长波红外地平仪的无热化光学系统设计与实现[J].红外技术, 2011, 33(11): 651-654. doi: 10.3969/j.issn.1001-8891.2011.11.007LV Yinhuan, LEI Cundong, CUI Weixin. Design and realization of athermalizing optical system for long-wave infrared horizon sensor[J]. Infrared Technology, 2011, 33(11): 651-654. doi: 10.3969/j.issn.1001-8891.2011.11.007 [6] 孟剑奇.衍射光学及其在红外成像系统中的应用[J].航空兵器, 2006, 20(6): 38-41. doi: 10.3969/j.issn.1673-5048.2006.06.011MENG Jianqi. Diffractive optics and its application in infrared imaging systems[J]. Aero Weaponry, 2006, 20(6): 38-41. doi: 10.3969/j.issn.1673-5048.2006.06.011 [7] 齐雁龙. 8-12 μm折/衍混合监视系统无热化设计[J].红外技术, 2009, 31(11): 676-680. doi: 10.3969/j.issn.1001-8891.2009.11.014QI Yanlong. Design on athermal infrared refractive-diffractive hybrid surveillance system at 8-12 μm[J]. Infrared Technology, 2009, 31(11): 676-680. doi: 10.3969/j.issn.1001-8891.2009.11.014 [8] Doshi R. Design and fabrication of diffractive infrared objectives for starring arrays[C]//Proc. of SPIE, 1994, 2269: 260-270.