MIL-PRF-49052G
Table II.
Saturation requirements for luminance gain.
Nominal input
Minimum
Minimum
Maximum
Maximum
Input
light level
allowable
allowable
allowable
allowable
Current
1
output (fL)2
output (fL)2
(fc)
gain
gain
(mA)
2 X 10-6
7,500
N/A
15,000
N/A
16
-4
2 X 10
1,500
N/A
4,500
N/A
16
1.0
N/A
0.3
N/A
0.9
N/A
20.0
N/A
0.3
N/A
0.9
N/A
1
in units of foot-candles (fc)
2
in units of foot-lamberts (fL)
3.6.8 Halo. The halo (see 3.12.8) produced by projecting a spot of light
onto the input of the assembly shall be no greater than 1.37 millimeters (mm) in
diameter.
3.6.9 Bright source protection. The assembly shall not be damaged (see
3.12.9) when subjected to an input illumination of not less than 50 millilumens
concentrated on the photocathode within an area not greater than 1 mm2 for a time
interval of not less than 1 minute. Additionally, the assembly shall have
luminance gain saturation characteristics throughout the applied illumination
period such that the light output is not greater than 3 millilumens or not less
than 0.37 millilumen. This requirement shall be met within 1 second after the
input illumination is applied. There shall be no discernible damage after a non-
operating period of not more than 24 hours.
3.6.10 Signal-to-noise ratio.
The signal-to-noise ratio of the assembly
shall not be less than 4.5.
3.6.11
Fixed pattern noise.
3.6.11.1 Multi-to-multi pattern variation (see 3.12.10). Multi-to-multi
brightness deviations from the mean value shall not exceed ±10 percent.
3.6.11.2 Multi-boundary pattern noise (see 3.12.11). The average value of
the brightness deviations of the multi-boundary intensities shall not deviate
from the mean value of the adjacent multi intensities by more than ±10 percent.
The mean value shall be established from the three adjacent multies containing
the above multi-boundaries.
3.6.12 Output brightness uniformity. When the photocathode is uniformly
illuminated with light at a color temperature of 2856 K ± 50, the output
brightness uniformity shall be such that the ratio of the maximum to minimum
brightness variation over the useful screen area shall not exceed 3:1. For input
illumination of wavelength 0.830 µm ± 0.001, the ratio shall not exceed 4:1.
Under the same conditions, when the screen is viewed with a 10 power (10X)
magnifier, the background shading shall be uniformly graded with no distinct
lines of demarcation between the light and dark areas.
7
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