Wednesday, July 2, 2008

Air Force Demonstrates 'Ghost Imaging'

By Sharon Weinberger

University_of_marylandAir Force funded researchers say they've made a breakthrough in a process called "ghost imaging" that could someday enable satellites to take pictures through clouds. The Air Force reports:

University of Maryland, Baltimore Campus, professor (Dr.) Yanhua Shih initiated ghost-imaging research in 1995, by using entangled photons. In the experiment, one photon passed through stenciled patterns in a mask to trigger a detector, and another photon was captured by a second detector. Surprisingly, an image of the pattern between the two detectors appeared, which the physics community called ghost-imaging.

In an article entitled "Reflection of a Ghost" that appeared in April's Physical Review, fellow researcher Dr. Keith Deacon indicated that ghost-imaging appears promising for future applications to satellite technology. Dr. Deacon said he believes ghost-imaging may enable a satellite to be equipped with a detector and that would be coupled with a second camera that would take images of the sun. That combination of technologies could generate ghost images of the Earth's surface, even if there are obstructing atmospheric conditions.

The image created in this new experiment is of a toy soldier.

[Image: University of Maryland]

Original here

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