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5. IMAGE INTENSIFIER TUBE
SPECIFICATIONS
The Unit utilizes a small size inverting image intensifier with
direct image transfer. The tube contains a microchannel plate,
multi-alkaline metal S-25 (NC tube type) or GaAs (N3 tube type)
photocathode, yellow-green screen and built-in electronic high
voltage DC to DC converter. The input window is made of flat
surface glass. The output window is a concave fibre optics
element with 180° image rotation.
Both tube types are manufactured in two grades HD (High
Definition) or XT (eXTreme performance).
5.1 Main parameters
Image Intensifier type NCXT3631IC N3XT3631IC
Photocathode operating diameter, mm
18
Photocathode type
S-25 GaAs
Resolution, lines/mm
45-57 (HD) / 57-72 (XT)
Photocathode sensitivity, min:
Integral, μA/ lm
500-750 1200-2100
Spectral at λ = 850 nm, mA/W
35 45
Tube light amplification, fl/fc, min
30,000
Image magnification
1
Dark background brightness, max, cd/m
2
1⋅10
−3