The dynamic of the homeland security market is much like that of the broader mil/defense landscape. That is, technology in and of itself does not a market player make. OTOH, airport security and perimeter protection is actually a hotbed of innovation. I did a story early last year on a little-known effort by IBM, which I still find fascinating (the effort, not my story). Take a look at "IBM Patenting Airport Security Profiling Technology."
The detection system itself is of marginal benefit unless it is linked with an action element able to stop the incursion.
To prevent hostile incursions I would suggest a copy of our Navy "PHLANX" system, which provides an awsome level of protectionm against incoming "anything". Because most of the information is classified, there may not be much more information available than what I have already mentioned. However, the term awsome is certainly applicable.
It's not marketed at the home market but at the "homeland security" market -- high-value domestic targets like dams, airports, power plants, air traffic control centers, prisons, borders, etc. My term of choice would have been domestic, rather than homeland security, but some government person post-9/11 chose homeland security (which always sounds vaguely Nazi-esque to me), so we are stuck with it.
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NanoSteel Co., which develops high-performance steel alloys, began producing steel powders for additive manufacturing (AM) last year and now supplies them commercially for freeform laser deposition and laser powder bed fusion processes.
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