How Does Night Vision Work?
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- เผยแพร่เมื่อ 8 ต.ค. 2024
- Sure, night vision looks cool in the movies - but what is it, exactly? How can a scope or a pair of goggles help you see in near-absolute darkness?
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So night vision seems like a pretty cool idea, right? I mean, you see it all the time in movies. Some secret agent-type straps on a pair of goggles, sneaks onto a luxurious supervillain compound and mows down enemies under the cover of darkness.
Or the Predator stalks Arnold Schwarzenegger, killing his platoon one, by one, by one… And as you’re watching all this, you may occasionally ask yourself “Hey, do those goofy-looking goggles really work?”
The answer is yes. Absolutely. With a good night vision device, or NVD, you can see a person standing over 200 yards (183 m) away on a moonless, cloudy night.
And whether we’re talking goggles, scopes or cameras, most of these devices rely on one of two types of night vision: image enhancement (that’s the green-looking one) and thermal imaging, which is the bluish-gray stuff. They both produce results, but work in different ways.
Thermal imaging captures the upper portion of the infrared light spectrum. Objects emit this as heat rather than reflecting it as light. Hotter objects - such as the bodies of secret agents - emit more of this light than cooler objects, like buildings, trees or, you know, dead bodies. And that’s what you’re seeing when you use thermal imaging, essentially. A measure of temperature from -4 degrees Farenheit to 3,600 F.
The magic (well, you know, science) starts at the lens, which focuses the infrared light emitted by all of the objects in view and uses a phased array of infrared-detector elements to create a temperature pattern called a thermogram, which is translated first into electric impulses, and then into data for the display, where it appears as various colors depending on the intensity of the infrared.
Then there’s image enhancement. This collects tiny amounts of light, including the lower portion of the infrared light spectrum, and amplifies it.
Image enhancers use a photocathode to convert photons into electrons, and high voltage to amplify those electrons in a microchannel plate, or MCP, before they hit a screen coated with phosophors.
Here’s the crazy part - these electrons maintain their position in relation to the microchannel they passed through, which provides a perfect image since the electrons stay in the same alignment as the original photons. When they hit the screen, their energy excites the phosphors, releasing photons. Those phosphors create the green image you see when you look through a night vision scope.
Night vision devices have been around for more than 40 years, and they’ve gone through multiple improvements. Today they’re used for everything from military applications to navigation and wildlife observation.
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pr-infrared.com... - วิทยาศาสตร์และเทคโนโลยี
forgot to mention why night vision is typically green. It's because the human eye can distinguish shades of green better than any other color. Thought that was interesting and wanted to share though many probably already know. great vid!
good info
AWESOME ANALOGY ON THE COLOR GREEN ,THATS WHY NEXT TO INVISIBLE IR LASERS ,GREEN ONES RE THE WORST !
There used to be red night vision and it made soldiers see things, that's why it was changed to green.
Multicoloured night vision also exists
It’s actually because of the Phosphorous filter used. Not your eyes xd
Sam Fisher approves
0:19 Predator didn't use night vision, it detected body heat. In a particular scene, Arnold ran from the predator and fell into water. The predator was looking for him, but couldn't see him because he had cooled down.
he used thermal vision which is far superior
he didnt seen him because thermovision camera dont see water as a transparent object, it just shows temperature of water
so you didn't watch past that part of the video?
As a just recently graduated private investigator student for a vocational college, I loved learning about this stuff and I'm even more excited to use it someday on the job. I love thermal imaging because if your investigating something or want crystal clear imagery to prove something of a person, thermal makes the subjects activities clear as day and great for evidence in court. However, thermal imaging is SUPER expensive. Image enhancement still offers clear visual, and is usually less expensive making it popular for smaller countries and private use. A thermal scout scope commonly used by 1st world nation militaries costs about $1,950 dollars, whereas image enhancement monocular scopes cost about $200 at your local sporting goods store in the optics section. Besides, as good as thermal vision is, I personally love regular night vision. Not so expensive, and very effective.
I got a subject ! Muscle growth in training ? Like bodybuilding ?
Or how sweat works and what does it do etc
I'm honestly sorry that you have so few subscribers/views. This is high quality content, considering multiple factors that make a video, not just the information. Keep up the good work!
Zarie Andrei Thanks Zarie!
There are a few factors in treating poor sight naturally. One resource I discovered that succeeds in merging these is the great gazer fix (check it out on google) without a doubt the most helpful blueprint i've heard of. look at all the extraordinary information .
Well they have almost 700 k sub's now ..😂 hope ur alive
Actually night vision has been used since WW2. The germans had very primitive ones setup on tanks and had a big IR spotlight so they could see.
Even older. Gen 0 was used by the Russians as well
How do "rain sensing" windshield wipers work?
Most rain-sensing wipers use a sensor that's mounted behind the windshield. It sends out a beam of infrared light that, when water droplets are on the windshield, is reflected back at different angles.
This tells the system to activate the wipers, as well as adjust wiper speed and frequency based on the intensity of the precipitation combined with the vehicle's speed. That's a convenience and potentially a real safety benefit when driving through heavy rain on a dark highway.
I know a thing to cover next: explain the relation between DNA-inheritance and epigenetics.
yes, we were only last night down the pub discussing that very subject over a game of darts.
Plz make video on electromagnetic spectrum
I just tried some high tech night vision my dad bought and it was soooooo cooool
Im defently subbing u guys your the best I hope yall get 1 million soon because im getting smarter coz of you dug hehe thx guys for these vids
The video was a very rapid overflight of night vision devices. You didn't cover the essential role of photo multipliers in the amplification of the available light, as well as the use of IR illuminators to increase the non-visible light. Don't be afraid to get a little more technical. You can also make these videos multi-part for those viewers that want to go into more depth.
Thermal imaging isnt “night vision” as it used often during light hours
Question, since image enhancement amplifies scarce amount of light, you wouldn't be able to see anything through it when there is absolutely no light at all, right?
Ho Jung Choi We were just discussing this the other day when the episode was being edited. We came to the same conclusion.
Ho Jung Choi IR illumination
Ho Jung Choi Right... image enhancement only amplifies light so its very useful in low light situations but not useful at all in 0 light or high light situations. This is normally what people think of when they think night vision. Infrared or "thermal vision" doesnt see visible light at all. It turns infrared waves into a visual picture. Infrared can be used anytime day or night (although its sometimes better at night because the background heat of objects is lower because they are cooler but nothing prevents it from being just as useful during the day.) This key difference the fact that it can be used day or night usually leaves it to be referred to as thermal imaging or heat vision instead of night vision.
samuraineko3 But you'd see theirs too. If it were a non-combative survival situation, they'd be adequate. Thermal imaging, however, is not dependent on ambient light at all. In total dark conditions, you have to go that way.
+BrainStuff - HowStuffWorks I have a cheap pair of 50$ goggles, theres a switch, it improves visibility when turned on but it emits a red light out of one eye, To me it seems like it emits some type of light not seen by the naked eye out onto the area, it works when there is no light, so I'm guessing its a different type of night vision. Any idea what it is?
Take diode from your remote control connect battery (3V or less) to it. Then tape it to the camera that it "lights" to the sight of view. Turn on the camera and walk into dark room. Viola. Your night vision googles.
More like invisible flashlight
what do you mean by "upper portion of the infrared light"? do you mean the far or the near infrared?
The far infrared.
You should definitely cover next.
""How to catch a prowler on your yard that has night vision""
Because that's why I'm looking up how Night Vision works
Hahaha it's simple,
Go get your own Night Vision device... Now you both will have night vision.
Let's hope it's not cold blodded and sneaks up on you from behind.
You're welcome.
Question, how does a fully automatic rifle work?
Anton Markovskis it works by having a group of guys wearing level 3 armor with guns kicking down your house door
Sounds interesting
Anton Markovskis It works fully automatically! :D
+Anton Markovskis (TGFAnton) If you haven't already found the answer, it uses the energy from the rifle round explosion to push back the cocking mechanism. The next bullet is pushed up by a spring in the magazine because the cocking mechanism is no longer in the way, while also pushing the empty case out. After that has finished, the spring in the cocking mechanism pushes it into the chamber where it is ready to fire again. I don't know the specifics for how the trigger works, but it has some sort of flint to create a spark that ignites the gunpowder, and im assuming it also uses the energy from the explosion to move the hammer back and forth. (The hammer strikes the flint which causes the spark)
+David Burke explains why you pull the bolt back when the is gun is jammed, to eject the jammed bullet
Can anyone please tell me how do photon change into electron?
I think an episode about how to find out the type of matter with it's light reflection,
will be a good idea.
You should do a full video of how gpnvg 18 works
I want to know can you see thought peoples houses with those night vision goggles
Nope!
*through
Question: DNA sampling using a cheek swab. How does the test isolates the Human DNA from all the other DNA from bacteria that also live inside the mouth?
Ethanol.
you could maybe explain why female and male faces look different. I don't understand that because we have the genitals to tell us apart, why do our faces have to be different.
***** thank you very much for that!
Leandra Sophie Hormones.
Not certain about the points made but ,if anyone else needs to find out about
20 20 vision without glasses
try Magonsi Simple Sight Expert (Have a quick look on google cant remember the place now ) ? Ive heard some super things about it and my buddy got excellent success with it.
Yay it's Lauren
How is it determined what other creatures can see? Can dogs see in the dark?
Hai i am from Indonesia, thanks for information
2:30 you forgot hunting Arnold Schwarzenegger.
Nice work !!! Why not use this stuff to make eyeglasses for seniors ?
Longfordboy Something like this would be way too expensive to mass produce for commercial use. And even if it can, terrorists and criminals would have easy access to it.
can I please know the name of the music at the beginning?
the blue-ish gray stuff is called white phosphor.
IR is a nice technology but it has nothing to do with night vision, you can totally use it in day light. Night vision is purely visible spectrum amplification, that can be either active or passive, depending on the system used.
good review
How do smells travel?
Key Gee It's also nice to consider that things you smell (like dog feces) probably have given off particulate matter that traveled into your nose to cause that sensation.
ACTUALLY QUITE SIMPLE ,ITS THE CONSTANT RELEASE OF ENERGY FROM A MOLECULAR POINT OF VIEW !!!
..been around for more than 40 years ... more like 80+ years heheheh
Germany's "The vampir", 1939.
Can anyone explain to me what the high pitch sound when turning on the goggles? I ask because I am trying to understand if the headset is using an electrical capacitor. If anyone has an answer please respond.
I know this is old but I think some elbit tubes with auto gain make a high pitched sound.
Here is a like. You just gained a subscriber.
Sweet WWII wasn't 40 years ago. They had NVD during WWII
The question here is wtf is 200 yards.
Yuri Matias a yard is the same as a meter.
BariumCobaltNitrog3n ish. lol
BariumCobaltNitrog3n A yard is .9144 meters. For small scales like this, roughly accurate a comparison. 200 yards is precisely 182.88 meters.
I meant to say ISH
Lol
Why are NVDs so damn expensive though?
thanks a lot for the vid.
I still don't understand how night vision work!!!! Sssssssttttttw!
It would be great if u add subtitle in your videos.. because u speak too fast... and.. im from malaysia which is english isn't our main language. BUT all your video is good though. Gud job there
Please cover "soylent green" next
Uh, ir night vision? Not thermal? Ya know those cameras with ir bulbs in the front? How does that work?
good video
Yes, second the comment great job great content.
Thanks. Question: How do you define 'light'?
Satellites, Planets & Sun have there own gravity force. That's why Satellites revolving around Planet, Planets revolving around Sun etc. I think gravity force of Sun is more powerful than the gravity force of Planets, that's why it's holding Neptune & Pluto. Why Sun's gravity not able to hold the Moon? What force make Satellites, Planets & Sun sipn on axis?
Night vision works by allowing you to see things in the dark using night vision.
Hello everyone here's something interesting, which got me thinking
If I were in a room that was extremely dark, no windows,
And now I have night vision goggles,
If I have a mirror, could I see my reflection?, is it even possible? Could the night vision goggles prove useless when it comes to mirrors in the dark?
Interesting thing to think about hey lol
If its 100% dark night vision wont work. Night vision amplifies light so you need some light even if your naked eye cant see it
Lastly if you do have that small amount of light to where you need night vision then you can see yourself in the mirror
¿So it´s not digital?
I've watched 3videos!!! An they seem like people who haven't used night vision goggles!
Vover next: Why can we not find other energy sources and why is Energy do hard to explain?
AkTiiVerSchwitzer We have plenty of alternative energy sources... the issue is that they are nowhere near as cheap as fossil fuels.
predator use thermal vision 😅, not night vision
thermal sights -for detection
night vision- for identification(like the blinkers of us army vest that can be seen when using night vision)
when i was a kid i thought it was just goggles with green lights in the inside-
you guys are awesome
+Gwyn Prata ^_____^ Thank you!
can we survive without sleeping
WE ARE SUPPOSED TO SLEEP 1/3 OF OUR LIVES ,I KNOW ,,,,,SUCKS DONT IT LOL
Hello Ms. Lauren, are you wearing a 50yen coin? It looks like it! :D Lucky coin!
Weird... She's a scientist, talking about science stuff, and yet she's using Fahrenheit?
You should be using the I.S.
Hey, I like your channel!! :D
+Everything I See ^____^ Thank you! /Lauren
NVG ! Not nvd no one that has common since or is in the military will ever refer to it as nvd
I like thermal
How does a range finder work?
Holy crap I love you
Nice makeup.
Cover body language and why you move your hands when talking to a crowd
How these tiny amount of light are collected from darkness
From the little less light coming from the moon (which is of course reflected sunlight).
what if we have that much amount of plant in our house that we need and they need?
question: extraterrestrials, do they exist? facts, myths, current research please!
Night vision is just visible radar
Nah nevermind not everything revoles around tactical equipment...maybe holographic imagery?
Moving around miss?
그냥 다 대본인가 보네요. 심지어 불도 안 끄고 편집으로 나이트 비전..같지도 않은 효과만 준겁니다. 이거 일본 대기실 몰카같은 것도 똑같던데ㅋㅋ
How does Ac work
How does marijuana work? Or hell, any other drug. Drugs tend to have pretty interesting effects on how the brain functions, I'd love to hear about one of them from you guys.
Please +Dnews cover this
HOW TO READ A BARCODE ?
how does wireless charging works
Night vision has been around since WW2. Not just 40 years lol.
"more than"
is telepathy really works ?
I.. dont know.... what to do...... with my hands....
Shits just magic
Me playing metal gear watching this
devices that can see through walls.
omg im in love
How do ac works
Goofy looking Goggles?
You mean awesome. Heck, eventually it will advanced to night vision glasses that is lighter on your face. Making it, less goofy
Flash bang grenade
are they same as the night vision of a owl eye?
Yea sure, A goddamn owl have electronic chips in his eyeballs.
@@ElwoodBluesAK You dont have to be a dick
Nice horsey.
arnoldswarts who?
It's Arnold Schwarzenegger.
Nothing...
0:20
27 sec in the video and already mixing thermal vision and heat vision... Great im not even gonna watch the whole thing
Muscle s push body fluids out the pours
what if there is no religion and race on earth is it helps or not help human race
Probably helps because there would be no more wars near Israel Pakistan and stuff
And others countries near there*
A question please : why we never landed back on the moon ??!!!!!!!!!!
it was a big lie right ? , I believe that so
Good stuff. Oh you're pretty cute too! :D
You do realise there is many different NVG colours right?
Green is the easiest to see by the human eye, so it's amplified electrons are seen long before other wavelengths become visible. By the time another color is amplified enough to see, the green would be so brightly visible it would drown it out. Are there exceptions? There always are. But 99% of the time, NODs of any quality are green. If they're blue or red, they're probably digital pieces of garbage.
@@Ranstone dang, you know your shit