Reflective chopper for infrared imaging systems.

摘要

A chopper (41), in an infrared imaging system, is used to scatter infrared radiation from a viewed scene (11). This scattered radiation is detected with an infrared detector (14) and used to produce a reference signal, which represents the uniform average radiance of the scene. This reference signal may be subtracted from a signal representing the unscattered radiation emitted by the scene, to produce a signal that represents only radiance differences and that is an optimal signal for amplification.