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首页> 外文会议>Physics, simulation, and photonic engineering of photovoltaic devices II >Efficiency of a micro-bubble reflector based, self-adaptive waveguide solar concentrator
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Efficiency of a micro-bubble reflector based, self-adaptive waveguide solar concentrator

机译：基于微泡反射器的自适应波导太阳能聚光器的效率

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摘要

State of the art solar concentrators use free-space, non-imaging optics to concentrate sunlight. Mechanical actuators keep the focal spot on a small solar cell by tracking the sun's position. Planar concentrators emerged recently that employ a waveguide slab to achieve high concentration by coupling the incident sunlight into the waveguide. We report on the development of an opto-fluidic waveguide coupling mechanism for planar solar concentration. The self-adaptive mechanism is light-responsive to efficiently maintain waveguide coupling and concentration independent of incoming light's direction. By using an array of axicons and lenses, an array of vapor bubbles are generated inside a planar, liquid waveguide, one for each axicon-lens pair. The mechanism uses the infrared part of the solar spectrum on an infrared absorbing medium to provide the energy needed for bubble generation. Visible light focused onto the bubble is then reflected by total internal reflection (TIR) at the liquid-gas interface and coupled into the waveguide. Vapor bubbles inside the liquid are trapped by a thermal effect and are shown to self-track the location of the infrared focus. We show experimental results on the coupling efficiency of a single bubble and discuss the effect of angular coupling. Furthermore the effect of an array of bubbles inside the waveguide (as produced by a lensarray) onto the coupling efficiency and concentration factor is analyzed.
机译：最先进的太阳能集中器使用自由空间非成像光学器件来聚集阳光。机械执行器通过跟踪太阳的位置，将焦点保持在小型太阳能电池上。近来出现了平面聚光器，其使用波导板通过将入射的太阳光耦合到波导中来实现高聚光度。我们报告了一个光-流体波导耦合机制的发展，用于平面太阳能聚集。自适应机制具有光响应性，可以有效地保持波导耦合和聚光度，而与入射光的方向无关。通过使用一系列的轴锥和透镜，在平面的液体波导内部会产生一系列的气泡，每对一个轴锥透镜均会产生一个气泡。该机制利用红外吸收介质上太阳光谱的红外部分来提供产生气泡所需的能量。然后，聚焦在气泡上的可见光在液-气界面处被全内反射（TIR）反射并耦合到波导中。液体内部的蒸汽气泡由于热效应而被捕获，并被显示为可自动跟踪红外焦点的位置。我们展示了单个气泡耦合效率的实验结果，并讨论了角耦合的影响。此外，分析了波导内部的气泡阵列（由透镜阵列产生）对耦合效率和集中系数的影响。

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