为了克服激光无线能量传输接收系统中聚焦光斑能量分布不均匀、光斑形状不匹配的缺陷, 设计并加工了一种梯形二次聚光器。依据边缘光线理论分析了梯形二次激光器的设计原理, 利用Tracepro软件进行了仿真, 采用直角梯形拼接的方法加工成梯形二次聚光器。在激光无线传能系统中对梯形二次聚光器进行了实验研究, 对比了菲涅耳透镜单次聚光和与梯形二次聚光器组合聚光时对激光电池效率的影响。实验得出, 在激光电池接收功率一致的情况下, 菲涅耳透镜与梯形二次聚光器组合产生的聚焦光斑能使激光电池的转换效率值提高6%~7%; 在计入二次聚光器损耗后, 激光电池的转换效率值提高2%~3%。结果表明: 梯形二次聚光器的使用可以提升激光无线传能系统接收端的性能。

In order to overcome the defect that the energy distribution is non-uniform and the shape of the spot does not match with the PV cells in the laser wireless power transmission receiving system, a trapezoid secondary concentrator was designed and processed. Based on edge ray principle, the design method of trapezoid secondary concentrator was analyzed and simulated by Tracepro software. And a trapezoid secondary concentrator was processed by four right angled trapezoid mirrors. Then the effect of the trapezoid secondary concentrator was studied through laser wireless power transmission system. The photoelectric conversion efficiency of PV cells under Fresnel lens single concentrator and combining with the trapezoid secondary concentrator was compared. Experimental results indicate that the value of photoelectric conversion efficiency of united concentrators was improved about 6%-7% compared with Fresnel lens single concentrator under the same received power of PV cells. If adding the loss of the secondary concentrator, the value of photoelectric conversion efficiency of united concentrators was improved about 2%-3%. It indicates that the trapezoid secondary concentrator could enhance the performance of laser wireless power transmission receiving system.