Tian Yi, Lv Lijun, Jiang Liwei, Wang Xin, Li Yanhong, Yu Haiming, Feng Xiaochen, Li Qi, Zhang Li, Li Zhuo
School of Opto-Electronics, Beijing Institute of Technology, Beijing, China.
Appl Opt. 2013 Aug 1;52(22):5411-9. doi: 10.1364/AO.52.005411.
We investigated the design method of an infrared (IR)/microwave (MW) micromirror array type of beam combiner. The size of micromirror is in microscopic levels and comparable to MW wavelengths, so that the MW will not react in these dimensions, whereas the much shorter optical wavelengths will be reflected by them. Hence, the MW multilayered substrate was simplified and designed using transmission line theory. The beam combiner used an IR wavefront-division imaging technique to reflect the IR radiation image to the unit under test (UUT)'s pupil in a parallel light path. In addition, the boresight error detected by phase monopulse radar was analyzed using a moment-of method (MoM) and multilevel fast multipole method (MLFMM) acceleration technique. The boresight error introduced by the finite size of the beam combiner was less than 1°. Finally, in order to verify the wavefront-division imaging technique, a prototype of a micromirror array was fabricated, and IR images were tested. The IR images obtained by the thermal imager verified the correctness of the wavefront-division imaging technique.
我们研究了一种红外（IR）/微波（MW）微镜阵列型光束组合器的设计方法。微镜的尺寸处于微观水平，与微波波长相当，因此微波在这些维度上不会产生反应，而更短的光波长会被它们反射。因此，利用传输线理论对微波多层基板进行了简化和设计。该光束组合器采用红外波前分割成像技术，在平行光路中将红外辐射图像反射到被测单元（UUT）的光瞳处。此外，使用矩量法（MoM）和多级快速多极子方法（MLFMM）加速技术分析了相控单脉冲雷达检测到的瞄准误差。光束组合器有限尺寸引入的瞄准误差小于1°。最后，为了验证波前分割成像技术，制作了一个微镜阵列原型，并对红外图像进行了测试。热成像仪获得的红外图像验证了波前分割成像技术的正确性。
