一种具有均匀衍射分布的电磁屏蔽激光红外双波段光窗

A laser & infrared dual-waveband electromagnetic shielding optical window with uniform diffraction distribution

镀制了金属网栅的蓝宝石光学窗口兼具激光红外双波段高透过性和微波波段优良电磁屏蔽特性。为了抑制电磁屏蔽光学窗口内金属网栅衍射产生的杂散光,提升光学系统的探测距离和分辨率,本文设计了一种具有随机圆环结构的金属网栅电磁屏蔽光学窗口,并对金属网栅电磁屏蔽光学窗口光学波段的衍射特性和雷达波段的电磁屏蔽效能进行了建模、仿真和测试。结果显示,本文设计的随机圆环金属网栅电磁屏蔽光窗具有优良的衍射均匀性,光学透过率满足使用要求,1~18 GHz频段范围屏蔽效能优于20 dB,具有优良的综合性能,有望应用在先进光电探测装备中。

Sapphire optical window which coated by metal mesh electromagnetic shielding has high transmittance in laser and infrared band, also has good electromagnetic shielding effectiveness in radar band. In order to suppress the stray light generated by the diffraction of the metal mesh in the electromagnetic shielding optical window, improve the detection distance and resolution of the optical system, and meet the needs of the new system of military photoelectric detection equipment, a metal mesh with a random ring structure is designed in this paper. A grid electromagnetic shielding optical window is used, and the diffraction characteristics of the metal mesh electromagnetic shielding optical window in the optical band and the electromagnetic shielding effectiveness in the radar band are modeled and simulated. The results show that the random ring metal grid electromagnetic shielding light window designed in this paper which has excellent diffraction uniformity and optical transmission. And the shielding efficiency in the 1~18 GHz frequency range is better than 20 dB. It has excellent comprehensive performance and is expected to be used in advanced photoelectric detection equipment.