This figure is from Nature.
With the slab, the transfer efficiency was 47% and the bulb shone brightly. Without the slab, efficiency dropped to 17% and the bulb barely glowed.
看到这篇文章(Appl. Phys. Lett. 98, 254101 (2011)),挺有意思。想起今年中国达人秀有一位中国年轻小伙,他的梦想是实现世界范围的无线输电。他的秀通过高压放电来实现,实在是危险。我个人观点,他这种思路用来无线输电是不现实的,一个满世界电弧的环境,哪里有安全可言?
不过,无线输电也不是天方夜谈,短距离的无线输电已经实现,并且有产品应用。最近购入一个电动牙刷,他的充电就是通过无线进行的。不过效率实在太低,普通philip剃须刀,充一次电只要不到一小时,可以用两周。而这个牙刷充电器充10个小时只能用10分钟(距离小于~5cm)。看来无线输电的路还有很长要走!
下面这篇文章就是介绍利用新型材料,可以增加无线输电的距离的。
Technology: A jump on wireless power Nature 474, 7353 (2011). doi:10.1038/474544a Wireless power transfer for consumer electronics has been hamstrung by modest efficiencies and transfer distances of just a couple of metres. But metamaterials — engineered materials with unique properties — can boost the transfer, say Bingnan Wang at the Mitsubishi Electric Research Laboratories in Cambridge, |
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