Armasight NAMPVS1401F9DA1 PVS14 FLAG MG Multi-Purpose Night Vision Monocular - Manual (Page 11)

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1.5 GLOSSARY
BLACK SPOTS. These are cosmetic blemishes in the image intensifier of the MUNVM or dirt or debris
between the lenses.
BRIGHT SPOTS. These defects can appear in the image area of the MUNVM. This condition is caused by
a flaw in the film on the microchannel plate. A bright spot is a small, nonuniform, bright area that may
flicker or appear constant. Bright spots usually go away when the light is blocked out and are cosmetic
blemishes that are signal induced.
BROWPADS. Three hook-and-pile browpads are provided to adjust the headmount to fit different
head sizes. The thin browpad (large head) comes attached to the headmount and the thick (small head)
or medium browpads are stored in the carrying case.
CAUTION. Condition, practices, or procedures that must be observed to avoid damage to equipment,
destruction of equipment, or a long-term health hazard.
CHICKEN WIRE. An irregular pattern of dark thin lines in the field-of-view either throughout the image
area or in parts of the image area. Under the worst case condition, these lines will form hexagonal or
square-wave shaped lines.
DARK (OR DARK AREA). A place in which there is very little light. It does not mean total darkness.
Generally, this means conditions similar to a quarter-moon or starlit night.
DARK-ADAPTED. Having ones eye adjusted to the monocular’s output under low light conditions.
DIOPTER. A unit of measure used to define eye correction. Adjustments to the diopter adjustment will
provide a clearer image in each eye.
EDGE GLOW. This is a defect in the image area of the monocular. Edge glow is a bright area (sometimes
sparkling) in the outer portion of the viewing area.
EMISSION POINT. A steady or fluctuating pinpoint of bright light in the image area and does not go
away when all light is blocked from the objective lens of the monocular. The position of an emission
point within the image area of the monocular does not move. An emission point should not be con-
fused with a point light source in the distance.
FIXED-PATTERN NOISE. This is a cosmetic blemish in the image area characterized by a faint hexago-
nal (honeycomb) pattern throughout the viewing area that most often occurs at high light levels or
when viewing very bright lights. Fixed-pattern noise is inherent in the structure of the fiber optics and
can be seen in every image intensifier if the light level is high enough.
FLASHING. This is a defect in the image area of the monocular. The image appears to flicker or flash.
FLICKERING. See “flashing.”
GAIN. This is the number of times a night vision device amplifies light input.
IMAGE INTENSIFIER. An electro-optical device that detects and amplifies ambient light to produce a
visual image.
INFINITY FOCUS. Adjustment of the objective lens so that a distant object, such as a star or the point
light on a distant tower, forms the sharpest image.
INTERMITTENT OPERATION. This is a defect in the image area of the monocular. See “flashing”.
IR SOURCE. This is an IR Light Emitting Diode (LED). When turned on, the IR source provides additional
illumination to enhance existing light conditions used only for performing nearby tasks.
MICROCHANNEL PLATE. A current-multiplying optical disk that intensifies the electron image pro-
duced by the photocathode.
NOTE. Essential information of special importance, interest, or aid in job performance.
PHOTOCATHODE. The input optic of an image intensifier that absorbs light energy and in turn re-
leases electrical energy in the form of an electron image.
SCINTILLATION. A faint, random, sparkling effect throughout the image area. Scintillation is a normal
characteristic of the image intensifier and should not be confused with emission points. Scintillation is
more pronounced under low light conditions. Also called “video noise”.