Patent ID: 6250583
Filing Date: 2001-06-26
Classification: F41H,G01S

Abstract:
An optical system for a target tracker comprising:a first detector for imaging radiation at a first frequency;a second detector for imaging radiation at a second frequency;a shared aperture element for transmitting radiation at said first frequency and reflecting radiation at said second frequency; said shared aperture element being positioned at a location relative to said first and second detectors so as to direct radiation at said first frequency to said first detector and radiation at said second frequency to said second detector said shared aperture element including a hole selected to correspond to an annular occlusion region of a predetermined high energy laser;means for gathering said reflected radiation and directing said reflective radiation to said hole; anda mirror, optically aligned to receive reflected radiation at said second frequency, wherein said mirror is rotatable about a predetermined axis between a first position relative to said detector where said detector is able to image a laser beam hit spot plus background radiation and a second position relative to said detector where said detector is able to image only background radiation.