Custom Night Vision | Data Sheets and Intensifier Tube Specifications
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- čas přidán 6. 06. 2024
- There's a lot to learn about the science and math behind how night vision works. In this video Kevin explains some important factors regarding tube specs, as well as what the numbers mean and how they correlate on the data sheets provided, when you buy from Custom Night Vision.
www.customnightvision.com
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0:00 - Intro
0:26 - Overview
1:15 - Photocathode Sensitivity \ Gain
2:26 - Signal to Noise Ratio
3:15 - Equivalent Background Illumination
4:55 - Resolution
6:03 - Halo
6:59 - Outro
This is great. I love playing around with your website and actually being able to see the tubes and their specs. If you're looking for video ideas, I'd love to see how you guys collimate tubes.
We’re going to do that soon
Great information! The LOST footage was genius! Aloha 🤙🏽
Glad you enjoyed it!
Thanks for the detailed breakdown. I'm slowly making my way into night vision and this information helps me understand some of the terms alot better.
You can always call and we can help make it easy.
EBI is the background noise of the image intensifier and comes from the thermal emission from the photocathode. The EBI adds noise speckles to the image. These noise speckles are only visible in the photon counting light-level range because a tube has high gain there. EBI is usually expressed in lux and can be compared to the photocathode illumination from the scene. It’s important because it’s one of the means to achieve a good SNR but it’s not a performance determining factor by itself. A tube with high photocathode sensitivity but a high noise factor in the rest of the tube may still have a poor signal to noise ratio. Thus consumers should not focus on EBI specifications as a stand-alone measure of tube performance.
I can't believe this comment is being slept on. I learned more from this comment than 10 hours of nvgtubers blabbering
I recognize the Lost scene! Damn that was long time abo
Resolution is a measurement performed by people certified to do so. In other words, line pairs per millimeter specifications are determined by certified people looking through the image intensifier at calibrated charts. The procedure to determine this involves an operation voltage, color temperature of the light, a specific projection lens, a calibration target e.g., USAF calibration charts or Mire de Foucault charts, a specific and standard camera setup and input radiation to achieve best contrast. Basically, the person reads the target chart and determines the limiting readable patten and compares that to a calibration chart to determine the resolution. Of utmost importance in all of this is the Modular Transfer Function (MTF). A good MTF, enables the viewer to discern contrast. The better the contrast, the better the detail, the better the detail the better someone can discern objects in low light or high light conditions.
How can this video still be under 1k views!? A lot of great info here
I'm not sure man, I feel like the video titles may be hindering the "findability" of some of these videos.
Excellent video that explains the technical details. Very well done.
I learned from this. Thanks.
Next day of I'll be using the builder ... I need to find my specs on the PVS-14 I have now ... the guys I bought it from were very helpful but nothing like ya'll are ... 100% buying my duals from ya'll... looking forward to doing business... stay safe frosty and free everyone... oh and
Thank you!
Awesome bro
What specs are good for low light rural operations where you must id things that are at farther distances vs urban where you have more background light to work with what’s the best specs for both situations
It's basically science
I’m just here to argue. And boost the algorithm
I'm very slow getting in night vision and I currently have a single monocular. I'm planning converting to bino, hopefully in the near future. With today's tubes, how important is tube matching now? Would the data sheet help get me close to a "perfect" matched tube?
Yes, having a data sheet to Mach is important.
the memes! lol i love them
So...
Higher SNR
Lower EBI =< 2.5
Higher LP which is the resolution
Lower Halo
Is that right? did I misunderstand any of that?
I understand the difficulty in a human being able to discern the difference in two relatively similar units, however I do wonder at what level do user's start to notice degraded capability? I'm sure it's going to depend on what stat you are comparing and who's eye ball is looking though it. At some point though SNR, Resolution, EBI and Halo all have to be different enough to make a noticeable difference right? Otherwise why charge more for better tubes and why rank them so stringently to begin with.
Do your staff have any personal input on this, like at what point are the stats different enough to readily tell you are looking through a worse unit.
By the time you get into such a dark environment to see the difference between a mediocre tube and a really high spec tube, all of the images even on the high spec tube have become so poor that you really need to turn on an IR Illuminator for any real PID. An IR Illuminator pretty much makes all tubes equal then.
That would depend on the individual. There is no way for me to quantify that. Better tubes are better but if you don’t know what to look for or don’t have 10 units to compare side by side it would be difficult to illustrate. I tell people if the SNR is over 35 you’re only making marginal performance gains as that number increases. However the difference between 31 and 35 SNR is definitely noticeable. EBI is environment dependent, halo isn’t typically an issue on current tubes.. selecting a well rounded tube/ tubes is really the best course of action.
Where ya'll located???
Houston TX
Im all about those celestial bodies.
Much higher SNR of education in this video than T-Rex part 1, though at 7:10 you basically make the same point that T-Rex 🦖 did.
I have to throw that in there for the 5% of potential customers who will never actually break the threshold and buy because they are incapacitated by the data.
Thank you. Waiting two Elbits bought on your super web site shipping to Ukraine(through US citizen) for hunting Russian invaders. Thank you. 🇺🇦🇺🇸🏴☠️🤝 It’s a pity of different restriction between our countries borders and laws. Cause we all like America and thank Americans for biggest support agains pigs.
My break brain.