This seems to be an approach to what seeing through the walls may look like in a potential near future. The MIT has released this technology showing the capability of their research, it has a wide range of applications regarding either emergency situations or the need to know what is happening in an inaccessible place. The following video shows how it works.
The cameras we are used to using only capture what is inmediatly in front of them, but this one fires a pulse of laser light at a wall on the far side of the hidden scene. Then, it records the time at which the scattered light reaches a camera. Photons bounce off the wall onto the hidden object and back to the wall, scattering each time, before a small fraction eventually reaches the camera, each at a slightly different time.
It's this time resolution that provides the key to revealing the hidden geometry. The position of the 50-femtosecond (that’s 50 quadrillionths of a second) laser pulse is also changed 60 times, to gain multiple perspectives on the hidden scene. And eventually, the obtained information is treated by a computer software to get the result.
The process now lasts several minutes but it supposed to last shorter according to what researchers said.
Via | Nature
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