A team of engineers at the University of Delaware has built and demonstrated a real-time mobile video camera that sees the environment through radio frequency (RF) waves as opposed to optical or infrared (IR) waves.
In early demonstrations, the device has shown that using high-frequency waves enables it to 'see' through non-metallic objects and detect concealed objects.
In December, the university announced the team received USD1.5 million in funding from the US Department of Defense (DoD) to reduce the size, weight, and power (SWaP) of the device in preparation for a live trial in May.
The ability to make the device smaller is important, Dennis Prather, endowed professor of electrical engineering at the University of Delaware, told Jane's . Typical imaging systems scale in three dimensions (3D) - they have a lens and have to be a certain distance from the focal plane. In an IR camera, or any kind of visible-light camera, the lens focuses the image onto film, or an electronic focal plane array, so they scale in 3D, Prather explained. "If I want to make a bigger lens, I have to make it deeper too, which means they scale volumetrically. If you can do it in a phased array like we do, it only scales in 2D, so it has a 'pizza box' scale factor as opposed to a moving box-scale factor," he said.
That means Prather and the team can make a system that more closely resembles a flat-panel television (TV) set. "It will still be big in area because that is proportional to the wave length. You really can't compromise that," he added.
"You can now imagine having an imager that is a RF video camera hanging on the walls much like a flat panel TV. That is the breakthrough we have been able to develop," he said.
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