Wireless technologies recently moved far enough. If even some 15 years ago for data transmission used infrared port (which was necessary to keep almost close to the transmitter, otherwise, alas, nothing happens), now with Wi-Fi and Bluetooth, we almost forgot about the wires in our smartphones. The last Bastion of the “wired era” is a charger that did not change probably since the creation of cell phones. And even the supposedly wireless charging need to hold the device directly to the charger, which is very similar to the transmission of data on IR port. But experts from the University of Washington showed that nothing is impossible, and we were able to charge the smartphone from a distance of 4 meters.
It is worth to mention that the battery has been used the most common, except for the fact that she was outside of the smartphone, as this is just the first test of new technologies. On the battery itself was a laser directed infrared from a distance of 4.3 meters. During operation, the laser gave 2 watts of energy, charge the smartphone almost as fast as regular charging. As stated by one of the authors of the study, Vikram Ayer,
“Our radiation source automatically detects the need for charging because the charging surface emits a high frequency sound signal. This system allows the emitter to note that the user placed the smartphone on the charging surface, which can be anything from a Desk to a small Mat. In addition, these surfaces may not be one, and build it practically anywhere.”
The laser itself is also quite cleverly arranged around the beam is the perimeter of the four “safety rays” reflected from a special surface around the battery. If someone or something crosses the beam, it primarily affects the “fuse” that interrupts the signal transmission, and the laser (despite the fact that he is not particularly harmful) may not cause any discomfort. When the obstacle disappears — the system continues its work. Well, another point concerns thermal energy emitted by the laser. For dispersion on the batteries will need to install the radiator. Although scientists argue that part of this energy is possible to assemble a thermoelectric generator and then put on an additional battery. In the future, according to scientists, the charging can be done from a distance up to 12 meters.
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Scientists for the first time, charge the smartphone from a distance of 4 meters
Vladimir Kuznetsov