New Camera Sees In Bullet Time
Here's your cool gadget of the week: a video camera that can follow speeding bullets midflight. I took a look at the gizmo, built by Nova Sensors Inc for the Air Force Research Laboratory, for Wired News. I've examined Nova's goods before. But this is the first time it's ability to mimic the Matrix's bullet time sequences has been revealed.
The first videos -- which you can see via the Wired story -- are crude. But it's an impressive capability. Existing sniper-finding systems rely on radar or acoustic sensors. And they can be heavy, bulky, and are one more piece of kit to carry. Nova Sensors device (known as VAST) can be integrated into a thermal imager, devices which are small enough for personal use.
Effectively, it could turn every round into a tracer bullet. Anyone firing at you would give themselves away immediately, even if the muzzle flash is hidden. From Nova President Mark Massieā€™s comments on the sensor, it sounds as though different types of rounds may have very different signatures, so enhanced software would not only be able to pinpoint the source of a shot, it could say what type of weapon is being fired. A system that tells you that two AK-47s and one AK-74 are firing from the upper story of Building A? Sounds pretty useful.
Interestingly, right at the moment a new evaluation is being carried out using ShotSpotter acoustic sniper location system in conjunction with Boeing's ScanEagle UAVs. The idea is that the ShotSpotter indicates the location and Scan Eagle goes over to get a better look. A ScanEagle equipped with the VAST camera system would be a logical extension of this idea.
(The bad guys could try to get around it by using bullets cast from ice when they are sniping, an approach only used so far in bad thrillers as far as I know. It's possible; it gives terrible ballistics and very limited lethality, but the bullets could not be tracked by the VAST system. Or at least, not until Massie's team spend five minutes on the software and get it to pick out cold objects against the warm background as well as hot ones.)
If only Zapruder had had one of these, we would be able to see exactly how many bullets were fired at Kennedy and from what direction...
There are likely to be a lot of other applications which are more prosaic than following bullets in flight. But as a first demonstration, itā€™s pretty impressive.
-- David Hambling
LAW: "The camera tracks with radar and sound"
NO - it tracks using the infrared image. It does not use radar or sound like previous systems.
The ice bullets comment was flippant, but I suspect it could be done if approached correctly. You can't simply use a bullet-shaped mould: the ice crystals have to be structured correctly for the forces involved.
Even a saboted round heats up significantly: travelling at sea level at mach 4 is going to create a lot of friction heating.
Lidar is nice, but this has the advantage that it's not an extra (expensive) piece of kit, it can be integrated into night vision systems.
Posted by: David Hambling at February 10, 2007 11:26 AM