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DIOPTER ADJUSTMENT—an adjustment of a device to a user’s
eyesight. The range for adjustment is usually plus or minus
4 Diopters.
DISTORTION—any variation of the display from the accurate
reproduction of an image.
EYE RELIEF—the required distance between a user’s eye and the
lens of a device to enable a full view of the object. Usually a
longer eye relief will afford a more comfortable view, especially
for people who wear glasses.
FIELD OF VIEW—the measured view a user sees when looking
through a device standing 1,000 yards away from an object.
FIXED-PATTERN NOISE—a light, immobile pattern seen on a
viewed image caused by a microchannel plate.
GAIN—the number of times amplification of light by a device
occurs. Tube gain is amplification taking place exclusively in
the intensifier tube and it can reach 50,000 times or more. It is
not as useful a measurement as System gain, which combines
tube gain, the power supply and optics. System gain can register
at 1,000 to 15,000.
GALLIUM ARSENIDE (gaAs)—a semiconductor substance used
in a photocathode of Generation III night vision devices that
contributes to increased photosensitivity.
GENERATION—a four-tiered classification of image
intensifiers.
• Generation 0—needs an infrared illuminator for operation.
Operates best in infrared conditions and was designed for
long-range viewing. Electron acceleration enables gain to be
achieved.
• Generation I—does not need an infrared illuminator for
operation. Operates best during normal ambient light
conditions and was designed for many professional and
home uses. Electron acceleration enables gain to be
achieved.