MIL-PRF-49052G
3.5.2.2 Gross distortion. Gross distortion (see 3.12.3.2) shall cause no
point on the image of a straight line, through any axis, to be displaced more
than ±30 µm relative to the best-fit straight line (see 3.12.3.3). Displacement
measurements shall be rounded to the nearest whole µm. The maximum slope of the
straight line image shall be less than 15 µm per millimeter (mm) across the line
image and less than 25 µm per any 2 mm from the best-fit straight line.
Distortion shall be measured along 4 axes which are 45 degrees apart. Distortion
measurements shall be initiated from an identifiable reference point located on
the fiber optic inverter. The line image cannot have more than two slope
reversals. Slope reversals less than ±5 µm shall not be considered as a change
in slope.
3.5.2.3 Image inversion. The fiber optic inverter
shall rotate a straight
line image 180 degrees ± 1 in a clockwise direction when
viewed from the display
side relative to the end points of the best-fit straight
line (see 3.12.3.3).
Image inversion measurements shall be rounded off to the
nearest tenth of a
degree.
3.5.2.4 Chicken wire. When the fiber optic inverter is viewed under 10
power (10X) magnification perpendicular to the plano-surface with the output in
contact with the phosphor faceplate, which is excited by ultraviolet light, or
with the output uniformly illuminated by a lambertian source, the fiber optic
inverter shall meet the chicken wire (see 3.12.4) limits specified in Table I.
NOTE: The areas in question shall be inspected in such a manner that light
is transmitted through the optic and the areas in question can be observed
and measured in accordance with 3.5.2.4 and Table I.
Table I.
Fiber optic inspection.
Length of chicken wire
Number of allowable
Number of allowable
in inches
incidences of chicken wire incidences of chicken
in zone 1
wire in zone 2
≤
.250
length
0
0
≤
length ≤ .249
.125
0
5
≤
length ≤ .124
.090
0
disregard
≤
length ≤ .089
.041
2
disregard
≤
length ≤ .040
.020
6
disregard
length ≤ .019
disregard
disregard
Zone 1
- 0.295 inch diameter circle whose center is coincident with the
optical axis of the fiber optic.
Zone 2
- 0.295 inch to 0.710 inch annulus concentric with zone 1.
3.6
Operational and environmental characteristics.
3.6.1 Photocathode sensitivity. Luminous sensitivity shall be no less than
260 microamperes (µA) per lumen for radiation with a color temperature of 2856
Kelvin (K) ± 50. Radiant sensitivity shall be no less than .015 ampere per watt
at 0.830 µm ± 0.001.
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