用于高灵敏度低温微波望远镜红外滤光片的聚合物的毫米和亚毫米表征
Millimeter and sub-millimeter characterization of polymers used for infrared filters in high-sensitivity cryogenic microwave telescopes
中文总结 AI 辅助
该研究对用于高灵敏度低温微波望远镜红外滤光片的尼龙6等聚合物，在毫米和亚毫米波段的吸收及90-330 GHz的波束散射特性进行了测量表征，为毫米波仪器噪声建模提供了关键数据。
中文摘要 AI 辅助
真空窗口和红外滤光片是毫米波接收机中重要的透射光学组件，它们能阻挡大气并减少冷级的辐射负载，从而提升低温性能。然而，常用作窗口和滤光片的材料的复杂光学特性表征不足，尤其在通带内和亚毫米波段。这些材料的吸收和散射特性对设计高灵敏度毫米波仪器愈发重要，因为其约束性差的特性是噪声建模中剩余的最大不确定性来源之一。我们报告了尼龙6、尼龙6/6、PTFE以及聚乙烯（包括用于透无线电滤光片堆的本体HDPE和泡沫HDPE）在毫米和亚毫米波段的吸收情况。此外，我们还报告了这些材料在90至330 GHz频段内从主波束散射出去的相对功率，该数据通过机器人辅助的扫描矢量网络分析仪在自由空间中测得。
英文摘要
Vacuum windows and infrared filters are important transmissive optical components in millimeter receivers, as they hold out the atmosphere and reduce radiative loading on cold stages, thereby improving cryogenic performance. However, the complex optical properties of the materials commonly used for windows and filters are poorly characterized, particularly in-band and in the sub-millimeter regime. The absorption and scattering properties of these materials are becoming increasingly important for designing high-sensitivity millimeter instruments, as their loosely constrained properties are one of the greatest sources of uncertainty remaining in noise modeling. We report the absorption in the millimeter and sub-millimeter regime of nylon 6, nylon 6/6, PTFE and polyethylene (both bulk HDPE and foam HDPE used in radio transparent filter stacks). Additionally, we report the relative power scattered out of the main beam by these materials from 90 to 330 GHz, measured in free space by a robot-enabled scanning vector network analyzer.
