MIL-PRF-49052G
3.12.3.2 Gross distortion. Gross distortion causes the image of a straight
line to curve. Gross distortion is caused by a long-range deformation or flow of
fibers during fabrication.
3.12.3.3 Best-fit straight line. A best-fit straight line is defined as a
straight line intersecting the +8 mm and -8 mm points of the input straight line
image. The +8 mm and -8 mm measurements are relative to the projected pattern
center point.
3.12.4 Chicken wire. Chicken wire is defined as a predominant pattern of
dead fibers which has a diameter equal to or less than 0.0009 inch (2 single
fibers) and whose light transmission is so degraded that with light projected
through the optic, single fibers in the area of question cannot be distinguished
or identified as single fibers with the use of 50 power magnification.
3.12.5 g. g is defined as the magnitude of the earth's mean surface
gravitational acceleration with a value of 32.2 feet per second per second.
3.12.6 Rise time and decay time. Rise time is defined as the time required
for the assembly to achieve 50 percent of its steady state performance after the
voltage source is applied to the assembly. Decay time is defined as the time
required for the assembly to achieve a screen brightness of less than 1 x 10-3 fL
after the voltage source is disconnected.
3.12.7 Ambient (room) temperature. Ambient (room) temperature is defined as
23 C +10o C/-2o C for all tests except EBI, for which room temperature is defined
o
as 23oC ± 2o C.
3.12.8 Halo. Halo is defined as a circular area of brightness evidenced on
the assembly output imaging screen occurring as a result of a small bright source
input and concentric with the input.
3.12.9
Damage.
Damage is defined as:
a.
Electrical failure or malfunctioning including arcing, corona,
flashing, bright spots, flickering, blinking, or change in input
current exceeding 1 mA.
b.
Cracks, breakage, deformation, corrosion, or deterioration of
any part or finish, and missing or loose components.
c.
Degradation of image quality including ion noise, dark spots, or
shading.
3.12.10 Multi-multi pattern variation. Multi-multi pattern variation is
defined as discernible spatial gain variation between individual multi-patterns
or groups of multi-patterns.
3.12.11 Multi-boundary pattern noise. Multi-boundary pattern noise is
defined as discernible spatial gain variation between peripheral and interior
channels of a multi-pattern or group of channels.
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