Direct method of extracting broadband complex refractive index from spectrophotometric measurements: an application to polydimethylsiloxane for passive radiative cooling.

IF 1.5 4区 工程技术 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
Braden Czapla, Leonard Hanssen
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引用次数: 0

Abstract

We describe an algorithm to extract the complex refractive index of a material from broadband reflectance and transmittance measurements taken by spectrophotometers. The algorithm combines Kramers-Kronig analysis with an inversion of Fresnel's equations to provide a direct method of solving for the refractive index which is accurate, even for weakly absorbing materials, and easily applicable to radiative heat transfer calculations. The algorithm is validated by extracting the complex refractive index of polydimethylsiloxane between 0.25 μm and 100 μm and comparing against existing literature. We also discuss the importance of broadband optical properties to passive radiative cooling and details of the uncertainty analysis of the algorithm.

Abstract Image

从分光光度测量中提取宽带复折射率的直接方法:用于被动辐射冷却的聚二甲基硅氧烷的应用。
我们描述了一种从分光光度计的宽带反射率和透射率测量中提取材料复折射率的算法。该算法将Kramers-Kronig分析与菲涅耳方程的反演相结合,提供了一种直接求解折射率的精确方法,即使对弱吸收材料也是如此,并且易于适用于辐射传热计算。通过提取0.25 μm ~ 100 μm范围内聚二甲基硅氧烷的复折射率,并与已有文献进行对比,验证了算法的有效性。我们还讨论了宽带光学特性对被动辐射冷却的重要性以及算法不确定性分析的细节。
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来源期刊
Journal of Photonics for Energy
Journal of Photonics for Energy MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
3.20
自引率
5.90%
发文量
28
审稿时长
>12 weeks
期刊介绍: The Journal of Photonics for Energy publishes peer-reviewed papers covering fundamental and applied research areas focused on the applications of photonics for renewable energy harvesting, conversion, storage, distribution, monitoring, consumption, and efficient usage.
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