I can't say I have any experience with PVS-14 or any Night Optical Devices, but from what I see online, it amplifies certain visible spectrum as well as near-IR. It doesn't seem to rely on IR much. And red dot sights aren't even IR are they? At least not entirely, cause you can see them with the naked eye.
Regarding glass being opaque to IR, apparently, it depends on the type of glass. I just remembered it from a Vsauce video (IIRC) where it was demonstrated to be opaque. But since term IR is vague and doesn't have super defined borders, and there are different types of glass, yeah, it's not a certain statement.
abfarid
joined 1 year ago
Fair enough, I was being too vague with my statement. I was implying that they don't emit much IR, as all bodies above 0 Kelvin do emit it. And LED/laser headlights almost don't, in comparison to xenon and stuff. I looked up some Xe emission graphs and some even straight up show the peak in near-IR, while laser/LED starts flatting out way before NIR.
Well, IR isn't heat, but it's associated with it. And since laser and LED lights heat up a little bit, yes, they of course produce a miniscule amount of IR. But it's pretty much negligible in comparison to their visible spectrum emissions. If you're already being blinded by the visible range of the laser, the IR part isn't gonna do much.
Yeah, it's absolutely clear that nothing is clear about its operation.
If I understood correctly, it captures visible light to use it for the amplification of the IR spectrum.
Now that I've read my own comment, I see that it came off harsher then I intended it to. Interpret it literally and not like a sarcastic statement.
Btw, just occurred to me that these would probably not work in a car at all, because regular glass is usually opaque to IR.
Do modern headlights emit IR? I don't think so. Which means these IR amplifiers wouldn't change the intensity of headlights.
Sorry, the last part wasn't addressed to you specifically, but to those who were saying that it's dangerous to go to Dubai.
Exactly! Just as I said in my earlier replies, if you disagree with the laws and customs, just don't go there. But also, don't spread misinformation.
Absolutely, use whichever search engine you prefer. "Google it" was used as a colloquialism to mean "search for it, using a search engine" and was not a direct endorsement of Google.
Yes, crime in Dubai happens. Yes, they have unreasonable and archaic Sharia laws. Yes, awful situations, like women being jailed for being raped happen, according to some sources, possibly even several times a year. But here's the unintuitive thing, it's still statistically safe. Whether you like it or not, that's how statistics work.
Here's an example to help people visualize it better. Every year, on average, 10-20 planes crash, with 100s of deaths, which is terrible. But, every year, on average, there are about 40 million flights, which comes up to about 0.00004% crash rate percentage. Every time you get on a plane there's a chance you're going to die in a crash, cause crashes happen regularly, and yet, it's the safest method of transportation.
Now let's make a rough calculation for the rape cases for tourists. Let's be generous (because UAE definitely underreports these incidents) and assume it happens not just several, but 10 times annually. There are 15 million tourist visits annually. That is roughly... 0.00007% chance. Depending on what numbers you pick, that is about twice as likely as being in a plane crash.
And to drive the final nail into the coffin, let's looks at some official numbers:
- Safe Cities Index 2021 Personal Security score: 67 (slightly above New York, San Francisco, to name a few), 35th safest city in the world.
- Numbeo Safety Index: 84.00 (Very high) (for comparison, New York has safety index of 50)
- Expat Insider Survey: Expats report their personal safety (93% vs. 83% globally) very positively.
In conclusion:
- UAE has archaic Sharia laws.
- If you are aware of the local laws and customs, and don't disobey them, you have very low probability of having any issues.
I'm sorry if I made the false impression that I know what I'm talking about. I'm just discussing and learning as I go. But I went back to the article and looked for the specific figures, and you were right, they are amplifying 1550-nm wavelength, which is NIR. And average glass is usually opaque to wavelength at around 2500nm, so it shouldn't get blocked. At least not much.