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The technique of taking pictures by pointing
a digital camera at the light source shining on an object rather than the
object itself, dubbed ghost imaging, extends to opaque objects. The method
works by splitting a weak beam of light and using a photon counter to detect
photons bouncing off of the object. Photons that are paired get split, with
one of the pair going to the camera and the other the object. The detector
signals the camera to record only photons that hit at that moment. The positions
of the recorded photons correspond to the positions of photons that hit
the object, allowing an image to form. Ghost imaging could lead to new forms
of x-ray imaging. Research paper: Ghost-Imaging Experiment by Measuring Reflected Photons Physical Review A, April 2008 Researcher's homepage: Yanhua Shih Related stories and briefs: Camera sees behind objects Quantum effect for chipmaking confirmed Back to TRN April 28/May 5, 2008 |
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