FULL
NIGHT VISION COMPLIANCE - NVIS per MIL-STD-3009
Night
Vision is the artificial amplification of natural light that
occurs at nighttime. Based in part on Einstein’s photoelectric
theory, the modern Night Vision Device (NVD) enables the user
to view objects essentially in the dark, as they would appear
in daytime.
To
effectively use a Night Vision Device (NVD) the user must
subject the NVD to natural nighttime radiant intensity levels,
which occur while under direct or indirect moonlight or starlight
or in the case of this discussion, the deliberate production
of artificial lighting that emulates a portion of the night’s
sky irradiance as to improve the ambient viewing levels of
the night sky when under diminished conditions for a NVD.
As
is known, the night sky exhibits a normal starlight/moonlight
spectral energy distribution, which resides in the 450 nm
to 930 nm range of the electromagnetic spectrum. The spectral
energy that resides from the 620 nm to 930 nm regions is typically
the area of sensitivity and amplification of the NVD. It should
be appreciated that the range of visible light is from 380
nm to 780 nm.
Due
to advancements in image intensifier technology, sensitivity
and resolution NVD performance has much improved and thus
its use is expanding, particularly within the military! With
an increased demand on the use of NVD’s there is also
an increasing need to provide artificial lighting when under
environmental or structural circumstances where little or
no natural nighttime lighting is present.
Providing
artificial lighting detectable only by U.S. DoD personnel
NVD’s shall prevent the operators from unaided enemy
visual detection while at the same time providing support
lighting to assist in the performance of the NVD.
We
use an ultra high grade Ultra Violet Filtering Polymethylmethacrylate
filter per ASTM-D4802 category 1A designed to meet or exceed
MIL-STD-3009 Night Vision Imaging System (NVIS) compatibility.
Physical Properties:
- Tensile
Strength 9,000 PSI min
- Elongation
at break 2% min
-
Specific Gravity 1.18 – 1.20
-
Shrinkage 3% max
-
Deflection Temperature under 264 PSI load 187 Deg F
-
Thermal Stability 354 Deg F 30 minutes
-
Impact Strength, Izod, J/m 16 min
Optical
Properties:
- Index
of Refraction 1.48 - 1.50
- UVF
Transmission 200 - 400nm 5% max
- Haze
3% max
- Spectral
Transmission refer tproduct detail
- Specular
surface, scratch and dig 60 -40 max
- Non-specular
gloss 65 +/- 10 GU
Neutral
Gray, Class B C NVIS Compatibility High Transmission
A
robust, monolithic polymeric optical filter designed to effectively
manage a variety of spectral sources to provide excellent
NVIS compatibility while maintaining superior light transmission.
This filter is very effective in removing the infrared signature
typical of heater wires commonly found on LCD displays. Our
filter is also very effective in direct view, direct sunlight
applications and can be used from overhead lighting to windows
or portals. As well, this optical filter is designed primarily
to manage infrared
energy of multi-colored ECDIS LCD displays without degradation
to the
emitted color pallet of the display.
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