High performance thermal imagers, such as the common modules are now readily available. These systems generally employ a scanning mechanism to generate the two dimensional display which makes their adaption to cheap, lightweight, small imagers difficult. However, with the advent of two dimensional close packed arrays of infra-red detectors the development of such a system is now becoming feasible. RSRE and MCCS, Frimley have jointly produced a small imager using cadium mercury telluride detectors. The system has been designed to be adaptable to use both 3-5 μm and 8-14 μm arrays, and to study various electronic correction mechanisms.