System for detecting a hot spot in an infra-red detected landscape

摘要

A system for detecting a hot spot in an infra-red detected landscape and which co-operates with a landscape scan system for converging towards an infra-red detector circuit a main beam emanating seriatim from various regions of the landscape; the system being characterized in that it comprises: optical filter means for preparing from the main beam consecutively in time at least two secondary beams each representing a part of the main beam spectrum; and a signal comparison circuit having an input connected to the detector circuit and whose output is the output of the system and which serves to compare the detector circuit signals corresponding to the various received secondary beams.