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Scientists develop laser that can find hidden objects from a mile away
by Ernesto Colwell (2021-04-01)
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Scientists in China have developed a laser that can locate a hidden object from a mile away.
Researchers hid a mannequin inside an apartment and fired a laser emitter at its location, determining the dummy's location by calculating how long it took photons to hit different parts of the room and travel back to the laser.
The technology, known as non-line-of-sight (NLOS) imaging, could be utilized by the military to find enemy targets or rescue teams to find victims.
It could also be beneficial in helping self-driving cars detect pedestrians and other vehicles from behind buildings.
Calculating how long it took photons to hit the walls of an apartment and bounce back to their emitter, scientists in Shanghai were able to determine the position and rough shape of a mannequin hidden behind a screen in an apartment a mile from their location
A team at the University of Science and Technology of China perfected the new technique.
They set up a laser emitter at the school's Shanghai campus and then hid a mannequin behind a screen in an apartment about a mile away.
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From their location at the school, they projected a pulsed laser at the apartment.
Some of the photons from the laser hit the apartment wall and bounced right back to a sensor next to their emitter.