| 激光无线能量传输接收端光束匀化装置设计 |
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| 引用本文： | 霍虹宇,苟于单,杨擎东,李娟,赵邦博,杨火木,王俊.激光无线能量传输接收端光束匀化装置设计[J].红外与激光工程,2021,50(12):20210102-1-20210102-9. |
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| 作者姓名： | 霍虹宇 苟于单 杨擎东 李娟 赵邦博 杨火木 王俊 |
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| 作者单位： | 1.四川大学 电子信息学院，四川 成都 610065 |
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| 基金项目： | 国家自然科学基金(61505129) |
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| 摘 要： | 激光无线能量传输中，激光光强分布不均匀和激光光斑与光电池形状不匹配会导致系统光电转换效率降低，局部温度过高，极端条件下甚至对光电池造成损伤。基于分布式匀化思想设计了一种激光接收装置，首先用光学整形扩散片在光电池各子区域进行光束初次匀化，然后用光学漏斗进行二次匀化和整形。针对1 cm×1 cm光电池，分析了光学整形扩散片的扩散角度和光学漏斗的高度对光束匀化效果的影响，优化后的激光接收装置的耦合效率ηc>95%，光强不均匀度Δ<0.05。此外，该激光接收装置对激光入射角不敏感，入射角为20°时，ηc>80%。搭建了3×3光电池芯片阵列的激光无线输能系统，采用分布式匀化激光接收装置，光强不均匀度由0.34降到0.12，光电池转换效率提升了65%。与正入射时相比，入射角为18°时，系统转换效率变化小于20%。结果表明，该分布式匀化激光接收装置有效提高了接收端的光强均匀性和系统光电转换效率，且对激光入射角不敏感，在激光无线能量传输中有重要作用。
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| 关 键 词： | 激光无线能量传输 光学整形扩散片 光学漏斗 激光匀化 光电转换效率 |
| 收稿时间： | 2021-02-09 |
Design of beam homogenizing device at receiving end for laser wireless power transmission |
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| Affiliation: | 1.College of Electronic Information, Sichuan University, Chengdu 610065, China2.Suzhou Everbright Photonics Co., Ltd, Suzhou 215163, China |
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| Abstract: | In the laser wireless power transmission, the ununiform distribution of laser light intensity and the mismatching of laser spot and photovoltaic cells shape will lead to the decrease of photoelectric conversion efficiency, local over temperature, and the damage of photovoltaic cells under extreme conditions. A laser receiver was designed based on the distributed homogenization method. Firstly, the light shaping diffuser was used to homogenize the beam in each sub-region of the photovoltaic cells, and then the optical tube was used for the second homogenization and beam shaping. For 1 cm×1 cm photovoltaic cells, the influence of the diffuse-angle of the laser shaping diffuser and the height of the optical tube on the beam homogenization effect was analyzed. The coupling efficiency ηc of the optimized laser receiver was more than 95%, and the light intensity nonuniformity Δ was less than 0.05. In addition, the laser receiver was not sensitive to the laser incident angle. When the incident angle was 20°, the coupling efficiency ηc was more than 80%. A laser wireless power transmission system based on 3×3 photovoltaic cells chip array was built. After using the designed laser receiver, the light intensity nonuniformity was reduced from 0.34 to 0.12, and the conversion efficiency of photovoltaic cell was improved by 65%. Compared with normal incidence of laser, the change of conversion efficiency was less than 20% when the laser incident angle was 18°. The results show that the laser receiver can effectively improve the light intensity uniformity at the receiver and the photoelectric conversion efficiency of the system. Meanwhile the laser receiver is insensitive to the laser incident angle. So the optical receiver can play an important role in laser wireless power transmission. |
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