How can acoustics technology help police locate gunshots?" October 30, 2006 In parts of cities like Washington, D.C., gunshot-detection systems are improving police response time to shots fired. Gunshots that once waited for responses to 9-1-1 calls from neighbors or the discovery of a body hours or days later now get reported automatically, within seconds of the event.
There are several gunshot-sensor systems on the market. Some use sensors designed to detect the sonic boom of a bullet that travels faster than the speed of sound. Others use sensors that pick up the optical characteristics of a muzzle blast, the explosion that propels the bullet out of the gun barrel. The heart of the system is acoustic triangulation. ShotSpotter uses 10 to 12 sensors spaced evenly throughout each square-mile section of the city it's covering, and each sensor is capable of hearing the sound of gunfire within a 2-mile (3-km) radius. A shot is fired somewhere in the city. We now have our gunshot location, at least in terms of distance from the sensors. Watch Person Of Interest Free Online.
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