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首页> 外文会议>Reflection, scattering, and diffraction from surfaces II >Preliminary characterization study of a gold-coated concentrator for hemispherical longwave irradiance measurements
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Preliminary characterization study of a gold-coated concentrator for hemispherical longwave irradiance measurements

机译：镀金聚光器用于半球长波辐照度测量的初步表征研究

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We report the preliminary characterization results of a gold-coated concentrator used for longwave irradiance measurements'11. Throughput measurements of the concentrator are conducted at 1.562 um and 10.15 um using two different approaches, one is referred to a transmittance measurement using the Complete Hemispherical Infrared Laser-based Reflectometer (CHILR)[2] of NIST, and the other one is a direct throughput measurement using an existing thermopile detector for longwave irradiance measurement. For the transmittance measurement using CHILR, two diffuse gold references are selected to generate a Lambertian source by shining a laser on them. Spatial variations of transmittance of the concentrator are also investigated by scanning the laser beam across the opening area of it with a gold diffuser. For the direct throughput measurement, a small diffuse gold integrating sphere of 25.4 mm in diameter is utilized to produce an ideal diffuse source. The thermopile detector measures the radiation passing through the concentrator from the small integrating sphere. The incoming irradiance is determined from signal outputs of the thermopile detector and ambient temperature changes. Comparing with the results from the two approaches, a consistent throughput of the concentrator is obtained about 91 % to 92 %. The error sources and uncertainty in the two measurements are also discussed.
机译：我们报告了用于长波辐照度测量的镀金聚光器的初步表征结果[11]。使用两种不同的方法在1.562 um和10.15 um上进行集中器的吞吐量测量，一种方法是使用NIST的完全半球形基于红外激光的反射仪（CHILR）[2]进行的透射率测量，另一种是直接测量。使用现有的热电堆检测器进行长波辐照度测量的通量测量。对于使用CHILR进行的透射率测量，选择了两个扩散金参考，以通过在它们上照射激光来生成朗伯源。聚光器的透射率的空间变化也可以通过用金扩散器扫描激光束的开口区域来研究。对于直接通量测量，使用直径为25.4 mm的小型扩散金积分球来产生理想的扩散源。热电堆探测器测量从小积分球通过聚光器的辐射。输入的辐照度由热电堆检测器的信号输出和环境温度变化确定。与两种方法的结果相比，浓缩器的稳定产量约为91％至92％。还讨论了两次测量中的误差源和不确定性。

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