Device for detecting a hot point in a scene by means of infrared radiation and missile guidance system equipped with such a device

摘要

A scanning infrared beam is split into two subbeams. The first and second subbeams contain radiation of wavelengths situated in a first and second subband of the infrared wavelength band of the beam. For each subbeam there is provided a separate radiation-sensitive detector. The output signals of the detectors are applied to a subtractor circuit, whose output signal indicates the presence of a hot point.