EMC at electro-optical system

Summary form only given. Electro-optical (EO) systems are widely used in military, paramilitary, and commercial environments. This paper is focused on EMC design of military and paramilitary systems. These EO systems include day and night vision equipment, Laser range finders and designators, photography subsystems etc. It is not uncommon to find in the same EO payload the following sub-systems; CCD TV camera (for day channel), FLIR (for night vision), laser range finder, laser designator, control circuit and components for payload stabilization, optical module and telescope. Some of these modules are basically noise generator sources, like lasers and PWM motor drivers, and some are very sensitive victims, like FLIR and TV camera. Both noisy and sensitive equipment are co-located in close proximity and confined in a small volume. EO systems have large openings for optical channels, like day and night windows. As a result, they are exposed to high electromagnetic (EM) fields as stipulated in MIL-STD-461 and MIL-STD-464. The EO system openings cause radiated emission and required special effort in order to meet MIL-STD-461 requirements. This paper concentrates on the above topics.