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(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 3-4). 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
interfere with the operator's ability to view the image or to
perform the mission.
FIGURE 3.4. 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 3-5). 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 mis-
sion.
FIGURE 3.5. CHICKEN WIRE
3-9
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