This article deals with the design, fabrication, and characterization of optically transparent electromagnetic screens to protect optical sensors against high-intensity radiated fields. To ensure the best tradeoff between high optical transparency over the entire visible light spectrum and high shielding effectiveness at microwaves, micrometric mesh metal films printed on glass substrates were selected. Changing the micrometric mesh pattern allows reaching various shielding effectiveness values required for different applications, but implies important adjustments of the design and fabrication processes. The variation of the number of contact ribbons between the mesh screen and its direct peripheral area consists of an alternative solution to modify the screen shielding effectiveness, while keeping the meshed part of the screen identical. An analytical model, which predicts the shielding effectiveness variation measured under statistically uniform illumination in a reverberation chamber as a function of the number of metal ribbons and the aperture sizes between them was specifically developed. Experimental results follow the trend predicted by the analytical model. As a result, adjusting the number of peripheral contact ribbons enables the shielding effectiveness to be fitted to specified requirements at constant optical transparency.

中文翻译：

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通过修改边缘终止几何形状来控制光学透明薄膜的屏蔽效果

本文介绍了光学透明电磁屏的设计、制造和表征，以保护光学传感器免受高强度辐射场的影响。为了确保在整个可见光谱的高光学透明度和微波的高屏蔽效率之间取得最佳平衡，选择了印刷在玻璃基板上的测微网状金属薄膜。改变微米网格图案可以达到不同应用所需的各种屏蔽效能值，但意味着设计和制造过程的重要调整。筛网与其直接外围区域之间的接触带数量的变化包括改变筛网屏蔽效率的替代解决方案，同时保持筛网的网格部分相同。专门开发了一种分析模型，该模型预测在混响室中统计均匀照明下测量的屏蔽效率变化是金属带数量和它们之间的孔径大小的函数。实验结果遵循分析模型预测的趋势。因此，调整外围接触带的数量使屏蔽效率能够在恒定的光学透明度下满足特定要求。