Super-sensitive Explosives Detector
Using a laser and a device that converts reflected light into sound, researchers at the Department of Energy’s Oak Ridge National Laboratory can detect explosives at distances exceeding 20 yards.
The method is a variation of photoacoustic spectroscopy but overcomes a number of problems associated with this technique originally demonstrated by Alexander Graham Bell in the late 1880s.
Most notably, ORNL researchers are able to probe and identify materials in open air instead of having to introduce a pressurized chamber, which renders photoacoustic spectroscopy virtually useless for security and military applications.
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