Certainly, microwaves would work: a test carried out in 2008 transmitted useful amounts ofmicrowave energy between two Hawaiian islands 148km apart, so penetratingthe 100km of the atmosphere would be a doddle.
当然,微波也能完成此项工作:2008年科研人员对微波做了实验,他们在两座相距148公里的夏威夷岛屿之间成功地传送了大量微波能量,因此微波要穿透100公里的大气层也将是轻而易举的事。
But microwaves spread out as they propagate.A collector on Earth that was picking uppower from a geostationary satellite orbiting at an altitude of 35,800km would need to bespread over hundreds of square metres.
但是微波在传播过程中会扩散,要想从轨道高度在35800公里的地球同步卫星上收集能量,地面能源接收器需涵盖几百平方米的范围。
Using a laser means the collector need be only tens of square metres in area.
而采用激光手段意味着能量接收器只需涵盖几十平方米的区域。
Dr Sweeney s team, working in collaboration with Astrium, a satellite-and-space companythat is part of EADS, a European aerospace group, will test the system in a large aircrafthangar in Germany.
斯威尼博士领导的研究小组与欧洲航空航天集团EADS下属的卫星与空间公司astrium合作研发,他们将在德国一座大型飞机库内对该系统进行测试。
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