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.
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