How to See Around Corners

from Nature News

The ability to see objects hidden behind walls could be invaluable in dangerous or inaccessible locations, such as inside machinery with moving parts, or in highly contaminated areas. Now scientists at the Massachusetts Institute of Technology in Cambridge have found a way to do just that.

They fire a pulse of laser light at a wall on the far side of the hidden scene, and record 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.

Science in the Media

Newspapers:

Magazines and Web Sites:

The Science-Media Intersection:

Science Blogs

Sign Up

... for Sigma Xi SmartBrief, a free daily summary of the latest news in scientific research, delivered straight to your in-box. Each story is summarized concisely and linked directly to the original source for further reading.

Click here to subscribe.

Subscribe to Our Content!

Visit our RSS Feeds page to choose among 13 customized feeds, or create a free My AmSci account to request an email notice whenever a specified author, department or discipline appears online.

EMAIL TO A FRIEND :

Of Possible Interest

Science In The News Daily: At the End of the Earth, Seeking Clues to the Universe

Science In The News Daily: Optical Memory Could Ease Internet Bottlenecks

Science In The News Daily: What Heinrich Rudolf Hertz Taught Us about Nothingness