Scientists have learned to look through walls with a laser

Scientists have learned to look through walls with a laser

It is impossible to see with the naked eye what is happening around the corner of the house, but with the help of modern technology, almost nothing is impossible. Technologies that ensure the visibility of objects that are out of sight (the so-called non-line-of-sight or NLOS) are of great interest to manufacturers of unmanned vehicles, because with their help the car will be able to "see" what is happening around the corner, before how will turn.


A team of researchers at Stanford University's Computational Imaging Lab has taken a big step forward in NLOS technology - finding a way to see through walls using a laser and a keyhole.


Currently, NLOS systems are not widely used, but in the future they can be used by rescue services to identify people after disasters, as well as in medicine to obtain improved images of internal organs of patients. The NLOS concept has proven its worth more than once, but current technologies are too slow to be effective enough.


In the past, experiments with NLOS have only been done on flat, reflective surfaces. The researchers exposed these surfaces to pulsed light beams (usually laser), captured the reflected beams, and analyzed what was behind the flat surface.


The Stanford University study does not solve the problem of speed, but it works under more varied conditions. The researchers simply shone a laser beam through the keyhole at a point on the wall. The photons from this beam scattered, "jumping" around the room and all the objects in it. After a while, a small number of photons returned through the keyhole, but they were not enough to determine what was in the room.


The experiment found that moving objects changed the pulsation of laser beams so that researchers could obtain enough data that, after being processed using artificial intelligence algorithms, gave a satisfactory idea of ​​the objects in the room.



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