A new class of uncooled infrared systems has been developed based on advances in both amorphous silicon detectors and signal/system processing techniques. Not only are these devices uncooled but they operate over a wide system ambient temperature range without the use of TEC's or choppers. The devices are DC biased and provide radiometric information from each pixel without the use of a calibrated source. The current imaging systems are medium (120x160) to low (15 x 31) resolution. They were designed with a very disciplined "concept-to-cost" technique in which cost, power, size, weight and performance were traded off in the stated order. The result has been a new generation of "ambient temperature" thermal imaging systems and radiometers.