Technical data

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B. Emission points
Emission points are steady or uctuating pinpoints of bright light in the image area that do not go away
whenallexternallightisblockedfromtheobjectivelens(Figure4-3).Thepositionofanemissionpoint
within the image area does not move. Not all emission points are cause to return the CO-MR. Verify that
emission points are not simply light sources present in the scene you are observing. Emission points are
acceptable if they do not interfere with the user’s ability to perform missions.
BRIGHT
SPOT
EMISSION
POINT
FIGURE 43. EMISSION POINTS AND BRIGHT SPOTS
C. Black Spots
Black spots are cosmetic blemishes in the image intensier or debris between the lenses. Black spots are
acceptable as long as they do not interfere with the user’s ability to observe the scene. No action is required
if this condition is present, unless the spots interfere with the operator’s ability to perform missions.
D. Fixed-pattern Noise
Fixed-pattern noise is usually a cosmetic blemish characterized by a faint hexagonal (honeycomb) pat-
tern that appears throughout the viewing area. This typically occurs in excessively lit environments or
whenviewingverybrightlights(SeeFigure4-4).Thispatterncanbeseenineveryimageintensierif
the level of light is high enough. This condition is acceptable as long as the pattern does not interfere
with the user’s ability to view an image or interfere with their ability to perform missions.
FIGURE 44. FIXEDPATTERN NOISE
E. Chicken Wire
Chicken wire is an irregular pattern of dark thin lines that can appear in the eld of view, either through-
outtheimageareaorinsectionsoftheimagearea(SeeFigure4-5).Intheworst-casescenario,these
lines will form hexagonal or square, wave-shaped lines. No action is required if this condition is present,
unless it interferes with the user’s ability to view the image or their ability to perform missions.
FIGURE 45. CHICKEN WIRE