潘越,徐熙平,乔杨.双DMD红外双波段场景模拟器光机结构设计[J].仪器仪表学报,2017,38(12):2994-3002
双DMD红外双波段场景模拟器光机结构设计
Opto mechanical structural design for two DMD infrared dual band scene simulator
  
DOI:
中文关键词:  半实物仿真  红外双波段  场景模拟  双数字微镜器件  光机结构
英文关键词:hardware in the loop  infrared dual band  scene simulation  two digital micromirror devices (DMDs)  opto mechanical structure
基金项目:国家自然科学基金(61605016)、吉林省科技发展计划(20160204062GX)项目资助
作者单位
潘越 长春理工大学光电工程学院长春130022 
徐熙平 长春理工大学光电工程学院长春130022 
乔杨 长春理工大学光电工程学院长春130022 
AuthorInstitution
Pan Yue School of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China 
Xu Xiping School of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China 
Qiao Yang School of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China 
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中文摘要:
      针对常规红外双波段场景模拟器多基于单数字微镜器件(DMD)设计、不能对两个波段进行差异化调制、只满足仿真测试的工作波段需求、实用性差的问题,提出了一种基于双DMD的双通道、共口径、两档变焦、结构紧凑的红外中/长波场景模拟器,并对投影系统、照明系统、双色合束镜等主要部分进行了详细的光机结构设计。光学引擎采用远心光路直接照明DMD靶面,利用空间立体式布局来避免不同光路间的干扰,且使用两块小型金属平面反射镜压缩照明光路以提高系统集成度;采用半运动学弹性夹持方式固定合束镜,重点计算了弹簧夹为得到最小预载应发生的偏转量及其在材料中形成的弯曲应力;利用MATLAB求解出两波段黑体的工作温度,并拟合出经光学系统后两波段辐射出射度与全红外波段黑体辐射出射度的比例关系ψ(T)曲线。测试结果表明,黑体温度为850 K时达到最高表观温度要求,中波图像对比度为250∶1,长波图像对比度为14∶1,满足现阶段红外中/长波场景模拟器的使用要求。
英文摘要:
      Regular infrared dual band scene simulators are mostly designed with single DMD, which cannot modulate the two wave bands severally. The single DMD based design can only meet the requirements of working wave band, but is not that practical. To solve this problem, a dual DMD based dual channel co aperture switch zoom compact structure MWIR (Medium Wave Infrared)/LWIR(Long Wave Infrared) scene simulator is designed. The optical mechanical structure of its main parts, including projection system, illumination system, and dichroic beamcombiner, are designed in detail. The optical engine adopts telecentric system to illuminate DMD target surface directly, which uses vertical space overall arrangement to avoid interference from different light path. Moreover, the engine uses two small size metal plane mirrors to compress illumination light path, so that system integration degree is increased. The beamcombiner is fixed in half kinematics elastic way, we calculate pinchcock’s deflection for the least preload, and its bending stress formed in material. Working temperature of black bodies in two wave bands can be calculated with Matlab, which also fits the proportional relation ψ(T) curve of after optical system radiation remittance of two wave bands and black body radiation remittance of overall infrared wave band. The simulation testing shows that when black body temperature reaches 850 K, it meets the highest apparent temperature requirement. The contrast ratio of mid wave image is 250∶1, and the contrast ratio of long wave image is 14∶1, which satisfies the operating requirements of infrared mid/long wave scene simulator at the present stage.
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