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Night Vision/NVIS/NVG Displays

Night Vision Imaging System (NVIS)
MIL-STD-3009
Lighting, Aircraft, Night Vision Imaging System (NVIS) Compatible

DEFINITIONS:

Night Vision Imaging System (NVIS)

A system that uses image intensifier tubes to produce an enhanced image of a scene in light conditions too low for normal navigation and pilotage.

Direct View Image NVIS (Type 1)

Type I lighting components are those lighting components that are compatible with Direct View image NVIS. Direct View image NVIS are defined as any NVIS that uses generation III image intensifier tubes and displays that intensified image on a phosphor screen in the user's direct line of site

Projected Image NVIS (Type II)

Type II lighting components are those lighting components that are compatible with Projected Image NVIS. Projected Image NVIS are defined as any NVIS using generation III, image intensifier tubes and projects the intensified image on a see through medium in the user's line of site.

Class A NVIS Class

Class A lighting components are those lighting components that are compatible with NVIS using a 625nm minus-blue objective lens filter which results in an NVIS sensitivity as shown in Figure C-4. (Standard AN/AVS-6 ANVIS are equipped with Class A Filter) Class A NVIS is not compatible with red cockpit lights because of the overlap between the spectrum of red light and the sensitivity of Class A NVIS

Class B NVIS

Class B lighting components are those lighting components that are compatible with NVIS using a 665nm minus-blue objective lens filter which results in an NVIS sensitivity as shown in Figure C-4. Class B NVIS is compatible with NVIS Red and therefore is compatible with properly filtered red lights and color electronic display. Class C was introduced more recently to allow the NVIS to have higher sensitivity in the green.