Electro-optical (EO) remote sensing is becoming more important for a growing range of civil and military applications. To-date the E0 band used spans the ultra-violet to the far infra-red (0.3μm to 14μm). In the military context E0 sensors form a major complementary element to the prime sensor-RADAR. The 2 key features which originally led to E0 being of high potential value are firstly the high spatial resolution possible and secondly passive (le non-radiating) operation. Consequently much research and development effort has been expended world-wide over recent years in producing automatic target-detection sensors with a very high probability of detection and low false alarm rate. Typical targets of interest include: - aircraft and missiles - AFVs - laser radiation - chemical and biological agents.