Signal-to-noise ratio:
This is by far the most important parameter for an Image Intensifier. It is
a measure of the light signal reaching the eye divided by the perceived
noise as seen by the eye. For Night Vision devices it is measured at a
light-level of 108 ulx.
The value of the SNR determines the resolution at very low light-levels.
Therefore, the higher the SNR the better the ability to resolve image
details under low light-level conditions. The SNR is related to the specific
design of the tubes.
Halo Size
The distance between the photocathode
and the MCP (Micro Channel Plate) determines how big the halo will
be. As you look to an active light source, you will see a halo
around the light source. The closer the MCP is located towards the
photocathode, the smaller the size of the halo. Typically 0.8 mm for
the XR5™ and 2.0 mm for the GEN III
