Coupling of sunlight into optical fibres and spectral dependence for solar energy applications
Coupling of sunlight into optical fibres and spectral dependence for solar energy applications
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DOI：
10.1016/j.solener.2013.04.008
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发表时间：
2013-07-01
期刊：
影响因子：
6.7
通讯作者：
Richards, Bryce S.
中科院分区：
文献类型：
--
作者：
Arnaoutakis, Georgios E.;Marques-Hueso, Jose;Richards, Bryce S.
光纤可以为太阳能聚光系统增添有趣的可能性，例如用于远程照明的光传输以及太阳能转换。为了有效地将太阳光耦合到光纤中，应确定控制耦合效率的关键参数。在本文中，新型两级太阳能聚光器和光纤的光线追踪模拟结果与实验测量结果进行了比较。特别是，通过分别分析一次和二次聚光器的焦比和接受角来优化耦合效率，同时特别获得太阳聚光作为波长的函数，以检查系统的光谱依赖性。接收角变窄的趋势导致耦合效率提高，单根光纤末端的最大聚光比达到 2000 个太阳（1 个太阳 = 1 KW/m(2)），通过控制主聚光器的色差进行光谱调整。一次聚光器和二次聚光器之间的任何不匹配都会显着降低耦合效率，尤其是二次聚光器的角度，为了获得最大性能，二次聚光器的角度应保持在光纤数值孔径的 50% 以下。通过优化这些参数并实现有效耦合，通过光纤利用太阳能应用可以更接近有用的商业应用。 (C) 2013 Elsevier Ltd. 保留所有权利。
Optical fibres can add interesting possibilities in solar concentrator systems, such as transport of light for remote illumination as well as solar energy conversion. In order to effectively couple light from the sun into optical fibres, the key parameters that control the coupling efficiency should be identified. In this paper, the results of ray-tracing simulations of a novel two-stage solar concentrator and optical fibre are compared to experimental measurements. In particular, the coupling efficiency is optimised by analysing focal ratio and acceptance angle of the primary and secondary concentrators respectively, while solar concentration is exceptionally obtained as a function of wavelength to examine the spectral dependence of the system. The trend towards narrower acceptance angles resulted in improvement of the coupling efficiency and a maximum concentration ratio of 2000 suns (1 sun = 1 KW/m(2)) at the end of a single fibre, spectrally adjusted by controlling the chromatic aberration of the primary concentrator. Any mismatch between the primary and secondary concentrators significantly reduces the coupling efficiency, especially the angle of the secondary concentrator, which should be kept below the 50% of the numerical aperture of the fibre for maximum performance. By optimising these parameters and achieving efficient coupling, utilisation of solar energy applications via optical fibres, can be brought one step closer to useful commercial applications. (C) 2013 Elsevier Ltd. All rights reserved.