Night vision system including field replaceable image intensifier tube

1. A night vision system comprising:

a housing;

an image intensifier contact assembly at least partially disposed in said housing;

an image intensifier tube at least partially disposed in said image intensifier contact assembly and being radially movable relative thereto;

a first locating feature affixed to said image intensifier tube and positioned to correct for misalignment between an optical center of the image intensifier tube and an optical axis of the night vision system; and

a second locating feature coupled to a component of said night vision system and adapted to interact with said first locating feature to to guide said optical center of said image intensifier tube into alignment with said optical axis of the night vision system.

2. The night vision system of claim 1 , wherein said first locating feature comprises a ring affixed on a first face of said image intensifier tube.

3. The night vision system of claim 1 , wherein said second locating feature is directly coupled to said component of said night vision system.

4. The night vision system of claim 3 , wherein said component comprises an objective assembly.

5. The night vision system of claim 1 , wherein said first locating feature is affixed to said image intensifier tube with an adhesive.

6. A multi-channel monocular comprising:

a housing;

a first image intensifier contact assembly at least partially disposed in said housing;

a first image intensifier tube at least partially disposed in said first image intensifier contact assembly and being radially movable relative thereto;

a first locating ring affixed to a distal face of said first image intensifier tube, said first locating ring being concentric with an optical center of said first image intensifier tube;

a second image intensifier contact assembly at least partially disposed in said housing;

a second image intensifier tube at least partially disposed in said second image intensifier contact assembly and being radially movable relative thereto;

a second locating ring affixed to a distal face of said second image intensifier tube, said second locating ring being concentric with an optical center of said second image intensifier tube and

a first objective assembly;

a first locating member coupled to said first objective assembly and adapted to mate with said first locating ring of said first image intensifier tube to to guide said optical center of said first image intensifier tube into alignment with an optical axis of said first objective assembly upon mating of said first locating ring with said first locating member;

a second objective assembly;

a second locating member coupled to said second objective assembly and adapted to mate with said second locating ring of said second image intensifier tube to to guide said optical center of said second image intensifier tube into alignment with an optical axis of said second objective assembly upon mating of said second locating ring with said second locating member; and

an eyepiece for combining images provided by the first and second image intensifier tubes.

7. The multi-channel monocular of claim 6 , wherein said first locating ring is bonded to said first image intensifier tube.

8. The multi-channel monocular of claim 6 , wherein said second locating member includes an orifice adapted to at least partially receive said second locating ring therein.

9. The multi-channel monocular of claim 6 , wherein said optical axis of said second objective assembly is transverse to said optical axis of said first objective assembly.

10. A method of aligning an image intensifier tube with an optical axis of a night vision system, said method comprising:

determining an optical center of said image intensifier tube;

affixing a first locating feature to said image intensifier tube in a predetermined relationship to said optical center;

positioning said image intensifier tube at least partially within an image intensifier contact assembly, said image intensifier tube being radially movable relative to said image intensifier contact assembly;

positioning said image intensifier contact assembly in a housing;

providing a second locating feature having a predetermined relationship with said optical axis of said night vision system; and

engaging said first locating feature and said second locating feature to guide said optical center of said image intensifier tube into alignment with said optical axis of said night vision system.