Perimeter security with a defense-in-depth strategy is a typical solution for many facilities when viewed under the new light of global terrorism and sabotage. Perimeter defenses include fences, barriers, guards and security patrols. A strategy of defense-in-depth for critical infrastructure facilities typically places several layers of sensitive intrusion detection sensors in an illuminated buffer zone between an outer perimeter fence and actual facility equipment. Such intrusion detection devices include infrared imaging cameras, short-range radars and laser radar (LIDAR, or LADAR). This last category includes the new Laser Perimeter Awareness System (LPAS), from Goodrich's Sensors and Integrated Systems Division.

The most effective perimeter-intrusion detection systems use multiple technologies to increase the probability of rapid detection and low false alarm rates under a range of atmospheric and lighting conditions. SUI's shortwave infrared (SWIR) cameras offer considerable benefits at facilities where atmospheric condition such as rain, fog and mist are common. These conditions typically blind visible cameras, but SUI's InGaAs SWIR technology is capable of seeing through all but the most severe conditions to provide highly accurate images. SUI's SWIR cameras also provide exceptional low light performance, essentially providing high quality images in all but total blackout conditions.

A landscape covered in fog, taken with a visible camera. The inset shows the advantage of SWIR cameras in foggy or hazy conditions.	Goodrich's LPAS Security Solution

Now a member of the Intelligence, Surveillance and Reconnaissance (ISR) Systems Division of Goodrich Corporation, SUI (Sensors Unlimited, Inc.) is the pioneer and world leader in the development and manufacturing of shortwave infrared (SWIR) photodiodes, arrays and cameras using Indium Gallium Arsenide (InGaAs) semiconductor technology. SUI looks continually to serve the security market with innovative shortwave IR products.