Compact Second Generation FLIR kit

A GEN II FLIR kit comprising:

• a detector-dewar having a cylindrical pedestal on the top thereof, said pedestal having at least one flat window therein revealing an internal array of far-infrared photodiodes, and a tubular fitting at the bottom thereof for coolant gas;
• a housing elbow including input and output straight tubular arms of uniform circular cross-section, having axes of symmetry as optical axes, said axes intersecting at a point to define a folded optical axis in said elbow;
• a flat corner mirror defining a first reflection plane centered on said point with a normal thereto through said point lying in a second plane containing said folded optical axis, said normal bisecting the angle between said axes;
• the walls of said arms terminating at input and output planes normal to their respective axes and extending from said point to define completely separated input and output open ends;
• the opposite ends of said arms being joined at their intersection to form a combined arm with a minimum of wall;
• the combined arm being joined to said corner mirror at said intersection;
• said mirror also being minimized by termination at the intersection of said first reflection plane with said combined arm to complete said housing elbow;
• said output open end engaging said pedestal;
• a set of imaging lenses mounted along said folded optical axis in said output arm;
• a set of decollimating lenses mounted along said folded optical axis in said input arm;
• and
• a motorized scanner module mounted over said input open end for rotatable adjustment about the axis of said input arm, whereby an optic axis projects into said scanner from said input arm;
• said scanner module including a scanning mirror, centered on said optic axis and pivoted on an axis normal to said optic axis in said scanner module;
• said scanning mirror being oriented to fold said optic axis substantially normal to said input arm axis over a full scan with 360.degree. freedom of adjustment about said input arm axis.