Si protection window for a night-sight operating at 3-5um range
Generally used as a front window transmitting over the working range to protect an optical assembling of IR night vision system. Detection range is 10km.
In combination with a window for a visible channel (for a daylight inspection - see below #2) such night-sights are placed at some military-oriented vehicles.Specification:
Part type
Plano-plano window
Material
Si
Overall dimensions, mm
218.0 (-0.3/-0.5) x 119.0 (-0.3/-0.5)
Thickness, mm
16 (+/-0.2)
Surface quality, scr/dig
60/40
Surface figure, fringes
N<=5, deltaN<=0.3 @633 nm
Wedge, arc. min.
<1
AR Coating (DLC/DLC type) @ 3-5 um
See the curve attached