Astro Night Vision Glossary and Reference
Glossary and Acronyms
There are other good Night Vision glossaries out there (such as this one), but here I'm pulling out specific terms and acronyms that are most relevant to astronomy.
- EBI - Equivalent Background Illumination: the amount of background light you see in the tube even when there's no light coming into it. You want this number as low as possible: 0.3 is outstanding, 0.1 is exceptional. This spec is much more important for NV astronomy than for other tactical uses of NV.
- ENVIS - Evader's Night Vision Imaging System. Generally used to refer to the objective lens that screws into a C-mount thread, which comes from the ENVIS pocket scope.
- FOM - Figure of Merit: combined metric of Resolution * Signal-to-Noise Ratio. Used for government acceptance of tubes.
- NV - "Night Vision", of course :-)
- PMT - short for "photomultiplier tube", also sometimes just called "tube"
- SNR, SR - Signal-to-Noise Ratio
PVS-7 Versions and Tubes
There are a bunch of technical terms around the PVS-7 which can be confusing: Omni V, VI, VII; B/D and A/C mounts; etc. This section summarizes that information.
ITT vs L3 Tubes
TODO: Summarize info in this thread: http://www.cloudynights.com/topic/546545-itt-vs-l3-white-phosphor-nv-tube/
Thin/Thick Film and Filmless