22:27 05 May 2017
Researchers from the Technical University of Munich have found a way to create 3D holograms using Wi-Fi signal instead of lasers. They achieved this by placing an aluminum cross in front of a Wi-Fi router with a reference router to one side. The researchers, whose work is scheduled to be published in Physical Review Letters, then recorded the difference in signals at the room and were able to create an image of the cross as a hologram. Although there are limitations, the study has raised interesting in which stray Wi-Fi signals can be used.
The authors also therorise that if the receivers are to be adapted and placed outside of the room, the contents of the room could be imaged from the other side of the wall. However, this can introduce a wide array of technical issues especially if there are other objects within the wall space that can distort the picture to be constructed.
Although this is an interesting development in finding new ways to use Wi-Fi, it is not the first time that researchers have co-opted Wi-Fi signals to peer through solid walls. In the past, another group of researchers used the signals to identify people in other rooms with 90per cent accuracy.