Infrared detector i.e. infrared camera, has zone filter arranged in optical path between infrared sensor and window, where zone filter passes light of wavelength range through zone and light of another wavelength range through another zone

摘要

The detector has an infrared sensor (5) accommodated in a vacuum housing (2) and aligned with a window (3) along an optical axis (A) such that an image (B) captured by an imaging optics is reproduced by the window at the sensor, where the window closes the housing. A zone filter (4) is arranged in an optical path between the sensor and the window, where the zone filter passes light of a wavelength range through a zone and light of another wavelength range through another zone. The zones are formed coaxial, concentric or symmetric to each other.