Theoretical model of thermodetection system

A theoretical model of thermodetection system based on the linear filter th eory is proposed. The modulation transfer function of a thermodetection sys tem is expressed as a product of the modulation transfer functions of its s ubsystems. A numerical technique for computing the optical transfer functio n of an objective based on the wave optics is proposed, which takes into ac count spectral characteristics of the imaging chain. Infrared images obtain ed with the model simulate well the experimentally obtained images.