American Technologies Network ATN PS31, Руководство оператора

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scene you are viewing.
Bright spots are acceptable if they do
not interfere with the operator’s ability to view the image or to
perform the mission.
EMISSION
POINTS
BRIGHT SPOTS
FIGURE 2.5. BRIGHT SPOTS AND EMISSION POINTS
(2) Emission Points. A steady or fluctuating pinpoint of bright light
in image area that does not go away when all light is blocked from
the objective lens of the goggles (Figure 2.5.). The position of an
emission point within the image area does not move.
Not all emission points make the NVG rejectable. Make sure any
emission point is not simply a point light source in the scene you are
viewing. Emission points are acceptable if they do not interfere
with the operator’s ability to view the image or to perform the
mission.
(3) Black Spots. These are cosmetic blemishes in the image in-
tensifier or dirt or debris between the lenses. Black spots are ac-
ceptable as long as they do not interfere with viewing the image.
No action is required if this condition is present unless the
spots interfere with the operator’s ability to view the image or
to perform the mission.
(4) Fixed-Pattern Noise. This is usually a cosmetic blemish char-
acterized by a faint hexagonal (honeycomb) pattern throughout the
viewing area that most often occurs at high light levels or when
viewing very bright lights (see Figure 2.6.). This pattern can be
seen in every image intensifier if the light level is high enough.
This
condition is acceptable as long as the pattern does not inter-
fere with the operator’s ability to view the image or to perform
the mission.
FIGURE 2.6. FIXED-PATTERN NOISE
(5) Chicken Wire. An irregular pattern of dark thin lines in the field-
of-view either throughout the image or in parts of the image area
(see Figure 2.7.). Under the worst case condition, these lines will
form hexagonal or square-wave shaped lines. No action is re-
quired if this condition is present unless it interferes with the
operator’s ability to view the image or to perform the mission.
FIGURE 2.7. CHICKEN WIRE