Patent ID: 6969856

Claim:
A two band imaging system, the two band system having an optical axis, the two band imaging system comprising: a. a mounting assembly; b. two infrared focal plane array detectors, the two infrared focal plane array detectors mounted on the mounting assembly, the two infrared focal plane array detectors are substantially perpendicular to each other; c. two filters of known band-pass, each filter placed in front of a corresponding infrared focal plane array detector, one of the two filters of known band-pass is a short wave infrared filter, while the other filter of known band-pass is a midwave infrared filter; d. a dichroic beam splitter, the dichroic beam splitter disposed within the system at an angle to the optical axis such that light entering the system is split and is simultaneously directed to each of the two infrared focal plane array detectors; e. a Dewar vessel, the two infrared focal plane array detectors, the two filters of known band-pass and the dichroic beam splitter disposed within the Dewar vessel; f. an image processor for providing real time absolute radiance imagery, the image processor simultaneously converting the light entering the two infrared focal plane array detectors into an absolute radiance image; and, g. an optic plate for correcting optical distortion of light disposed within the system, the optic plate is disposed between the midwave infrared filter and the dichroic beam splitter.