短波红外成像变焦匀化激光照明系统（英文）
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摘要
针对近年来得到迅速发展的短波红外成像系统,分析了增加激光主动照明的必要性.目前常用的激光照明匀化方案均匀性均不高,达不到照明成像的要求.提出了连续变焦激光照明系统,使用成像镜头把光纤端面的像直接成像在被照明表面,照明光斑均匀.分析了变焦照明系统的设计理论,设计了25倍变焦的短波红外激光照明系统.该照明系统的光学镜头由3组镜片组成,由凸轮结构实现连续变焦.体积小,结构简单,变焦倍数大.最终实现了2～50°的照明角度连续变化.照明光斑均匀度达到92.7%.进行了野外成像实验,对人员识别距离可达1.2 km.设计的连续变焦激光照明系统对提高短波红外成像系统的夜视能力具有较高的意义.
Recent years,shortwave infrared( SWIR) imaging system has been developed rapidly,and additional active lighting is very necessary in some scenarios. At present,the uniformities of laser illumination homogenization schemes commonly used are not high,and can't reach the requirements of imaging. A new 25 × zoom laser illumination system was designed based on the analysis of the laser model in fiber and the theory of zoom illumination system. The optical lens of the illumination system is composed of three groups of lenses,and the CAM structure achieves continuous zooming. This system is small in size,has simple structure,and gains large zoom ratio.Finally a continuous change of 2 ～ 50° in illumination angle is achieved. Laser illumination intensity uniformity reaches 92. 7%. In the imaging experiments,the human identify distance was up to 1. 2 km. The continuous zoom laser illumination system is of high significant for improving the ability of the short-wave infrared night vision system.
Recent years,shortwave infrared( SWIR) imaging system has been developed rapidly,and additional active lighting is very necessary in some scenarios. At present,the uniformities of laser illumination homogenization schemes commonly used are not high,and can't reach the requirements of imaging. A new 25 × zoom laser illumination system was designed based on the analysis of the laser model in fiber and the theory of zoom illumination system. The optical lens of the illumination system is composed of three groups of lenses,and the CAM structure achieves continuous zooming. This system is small in size,has simple structure,and gains large zoom ratio.Finally a continuous change of 2 ～ 50° in illumination angle is achieved. Laser illumination intensity uniformity reaches 92. 7%. In the imaging experiments,the human identify distance was up to 1. 2 km. The continuous zoom laser illumination system is of high significant for improving the ability of the short-wave infrared night vision system.
引文
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[2]Borniol E De Guellec,F,Castelein P.High-performance 640×512pixel hybrid In Ga As image sensor for night vision[C].SPIE,2012,8353:8353-05.
[3]Nichter J E,Martin T J,Onat B M,et al.Develop multipurpose InGa As focal plane array visible/SWIR camera for staring and range-gated applications[C].SPIE,2007,6572:65720I.
[4]Richard A.IR Imaging Optics Meet Varied Needs[J].Photonics Spectra,2012,46(8):.
[5]Frieden B R.Lossless conversion of a plane laser wave to a plane wave of uniform irradiance[J].Appl.Opt.,1965,4(11):1400-1403.
[6]Sales R.M..Structured microlens arrays for beam shaping[J].Proceedings of SPIE.2003,5175:109-110.
[7]WANG Ying-shun,LIAN Jie,GAO Shang,WANG Xiao,SUN Zhaozong.Illumination Uniformity of Near Infrared Illuminator[J].Acta Photonica Sinica,2013,42(3):258-261.
[8]Hirai T.,Fuse K.Kurise,K..Development of diffractive beam homogenizer[J].Sei Technical Review,2005,60:17-23.
[9]YUAN Li-bo.Light source and the optical field formed by an optical fiber[J].Optical Communication Technology,1994,18(1):54-64.
[10]LI Ai-yun,WANG Xiao-ying.Study on Optical Properties of Fiber Bundle Coupling LD Output Beams[J].ACTA P HOTONICA SINI-CA,2007,36(9):1664-1667.
[11]QI Xiao-ling,WANG Fu-juan,CAI Zhi-gang,et al.Intensity distribution of transmitted beam of multimode optical fiber[J].Semiconductor Optoelectronics,2003,24(2):117-120.
[12]DU Yu-nan MU Da,LIU Ying-ying,WANG Wen-sheng.Design of 20×Long Wavelength Infrared Zoom Optical System.Infrared Technology[J],Infrared Technology,2013,35(10),607-611.