Contemporary times are marked by electronic gadgets, as technology takes lead. With the recent technological advancements certain electronic gadgets have gone wireless. This improves the accessibility, efficiency and easy handling of such devices. An innovation made by the German student recently is groundbreaking.
Dennis Siegel, of the University of Arts Bremen have built an electromagnetic harvester that recharges AA battery by consuming the radiations in the environment. These radiations constitute the emissions of any electronic gadget working in that surrounding. These harvesters thereby gather free electricity from anything ranging from overhead power lines to wifi router radiations. Siegel has built two versions of the harvester. One for, low frequencies and the other for megahertz and gigahertz radiations.
Free electricity from air through radiations, might sound like pseudoscience magic but, it is actually possible. Phones now enable sharing of files wirelessly through bluetooth service. In a similar way, there are chances to produce electricity through radiations present in air.
The underlying science between the bluetooth service and electromagnetic harvesters is almost identical. Every electrical device is bound to emit electromagnetic radiations. These radiations when passes across a coil of wire, produces electrical energy. There is no detailed description of the functioning of electromagnetic harvesters as Siegel might not want to disclose complete information before receiving patent rights. However, his general description of “coils and high frequency diodes” tallies with how wireless power transfer works.
The efficiency however, of wireless gadgets is dependent on the range and orientation of the transmitter. Also on the efficiency of coil to transform the radiations into electricity, is another. For, Siegel’s harvester the strength of the electromagnetic field is another factor of efficiency. The amount of time the harvester takes to charge AA battery varies with devices present in the surroundings. Siegel was able to charge AA battery using electromagnetic harvester in a day, by sitting next to huge power substation. Hence, like efficiency time also becomes an issue.
The innovation made by Siegel is interesting but the efficiency and time factors stand as factors to be taken care of. Few of them backlash against this innovation by asserting that it could lead to electricity theft. Technology hackers might take advantage of such harvesters and can steal electricity from power stations or from someone else’s house. Care must therefore be taken to avoid such flaws, to improve the practicability of electromagnetic harvesters.