Abstract: An image intensifier 18 is comprised of an evacuated chamber, an input surface 16 having a florescent material thereon for converting incident radiation into a visible light representative of the incident radiation, a photocathode layer 20 disposed closely adjacent the input surface for emitting a cloud of free electrons 22 into the evacuated chamber in proportion to the intensity of visible light at each point thereon, and an output surface 26 having a scintillating material thereon for converting electrons impinging thereon into a relatively bright light image proportional to the electron energy at each point on the output surface said light image having a first aspect ratio. An electrical potential 24 accelerates the free electrons from the photo-cathode to the output surface. A fiber optic bundle 28 comprised of an input face, positioned outside the chamber to view the bright light image at the output surface, and an output face 34 is provided.

Abstract: An imaging system comprised of a source of penetrative radiation 14, an image intensifier tube 18 and a video camera 38 is provided. The intensifier tube is comprised of a input screen 22 and an output screen 24. The intensifier tube converts radiation 20 impinging on the input screen into a visible light image 36 on the output screen 24. The video camera is operatively positioned to view the output screen of the intensifier. A light sampler 50 is operatively disposed in the visible light path between the image intensifier output screen 24 and the video camera input 38. The light sampler is comprised of a mirror 52, a focusing lens 54, a beam splitter 56, an aperture 58, a light source 78, a photo receptor 60 and an optical aligner 64.