Schlieren Imaging in Color!
ฝัง
- เผยแพร่เมื่อ 29 ก.ย. 2017
- How Schlieren imaging works in color, black and white and slow-mo.
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Special thanks to Patreon supporters:
Tony Fadell, Donal Botkin, Curational, Jeff Straathof, Zach Mueller, Ron Neal, Nathan Hansen, Corvi
Support Veritasium on Patreon: ve42.co/patreon
Filming by Raquel Nuno
Sound Effects by A Shell in the Pit
Whoever suggested color filter - kudos to you!
what would happen if there were 4 different colours?
He should do a smooth gradient of for example a rainbow, instead of just two colours.
Yeah, try printing a color wheel on a transparent plastic sheet, then focus the light through its center. Should produce some pretty interesting results, I think.
ArnoldsK what's kudos?
Fly Intercourse It means hug, when you surround another person with your arms to show affect.
Sorry for being away for such a long time!! I've been shooting a documentary and that's involved a lot of travel - to Boston, Paris, Glasgow, Baltimore, DC, Houston, and now I'm home for a few days before heading off to Australia. I really appreciate your patience and support.
Veritasium when will the documentary be out?
Veritasium you should explain bio-kinetic energies
how big of a parabolic mirror could you use for schlieren imaging?
Get the Slow Mo guys in there and play some music to see the shockwaves :D
Can you show how electricity looks
Hi Derek. This might get lost in a sea of youtube comments, but nevertheless I have a suggestion for a sound-based Schlieren imaging experiment. I was wondering if it is possible to observe a 3D standing waves in air (or some other transparent medium). Standing wave will create a pressure differences, so theoretically we should be able to see with this technique the pressure gradients between nodes and antinodes. With proper set up we might see similar patterns as Chaldni patterns produced on a 2D plane. The technical realization will probably be a bit more difficult, but this was just a quick idea that crossed my mind.
He'll need a much higher frame rate to capture it, hence the needed backup mentioned towards the end of the video. I don't know how high frame rates can go, but I'm willing to bet it's doable
@@myca. Slo-Mo guys or Destin
Signal generator so you can dial in sound frequencies, or maybe just a tuning fork. Sand in a speaker will form patterns from the sound vibrations which are 340 m/s so these patterns must be standing waves. It may still be difficult to see a standing sound wave pressure differences in air, it might be easier to see the effect on the rising heated gas from a candle. With a signal generator you might be able to change frequencies and capture video of the change in standing waves in your rising gas. (You posted this a year ago. Any results?) [And I just had the probably whacky thought: What about the slit test and Schleiren? Don't ask me for results, I'm still fiddling with the basic set up.)
Standing wave seems a good idea. You don't need high speed camera since, by definition, the wave is standing still.
The wavelength (frequency) can be adjusted for the best resolution.
The standing wave is an intriguing idea. If it works at all, maybe use a frequency that's very close to the frame rate of the camera. That way the strobing effect might be used to see the antinodes change in slo-mo.
watching a video about Schlieren in Schlieren, Switzerland.
The amount of hardwork you put in for creating is really inspiring.
wrg
Your comments are everywhere!!??
Hard work. Two separate words.
Sam Krochman 😂
Ashit Anand Hahaha yes I like to put a positive comment on every video I like! I hope you don't mind :p
That is some sick vaporwave art with those filters!
ISiupick I was thinking the same thing hahaha
"Using this razor blade to cut the light"
Why does that sound so dam cool to me 😂
wrrr
Hey!! If you placed an ice cube next to a candle could we be able to see the heat transfer between the candle and the ice cube? I'd like to see it if possible thank you ^^!
To see thermal radiation (IR) you just need a flir cam.
Make a collab with the Slow mo Guys. this would be cool :D
was gonna say the same, if you need high framerate to 'see' sound, they've probably got what you need for it.
i imagine they'd also be down for a video on shlieren
i think he meant destin from smarter every day
Or Destin from SmarterEveryDay, he has 100000fps camera too.
oh yes
if you read my comment then you can also answer. please.
"I may need to call in some support..." This sounds like a job for @theslowmoguys !!!
or @smartereveryday
Hell yeah the slow mo guy
DeepDarkier or both! :3
dont think the slowmoguys know how to visualize sound waves, they're more about just pointing a slomo cam at stuff
+Sato Yeah, but they do have an ultra slow motion camera, which should be useful for searching for shock waves traveling at Mach 1.
Today on How It's Made: Schlierens!
First, you take a plumbus..
Just a regular ol' plumbus?
;D
Second, get as drunk as Rick Sanchez!
You have manage to explain "concave lens" light behavior in the most compelling way I have seeing in the all my Collage student years hahaha.
Shhhhhhhhhhlieren. That's a tough one. Getting hypno vids at 5:20 o.o
PictureFit hello
+PictureFit
Hey PictureFit! So you're interested in physics as well. You and Veritasium should do a collab on the physics of different exercises
When you blew up that bubble SO close to the mirror my heart jumped because i remmemberd how mauch work it takes to clean my telescope 😭😭😭
The two-colored piece is awesome, the color contrast helps to see the flow movement much better.
Internet + Veritasium = mind blown. Well done.
Please just upload 30m of uninterrupted colored Schlieren Footage.
This looks mesmerizing.
I could watch these experiments all day. Epic
i am actually doing this
This was really cool, wow, the images are stunning! I loved the colored ones, so pretty
This is by far the most clear and concise demonstration I've seen of Schlieren photography. It would be great to see the currents of an ionocraft!
Also, enjoy your trip, Derek.
Razorblade on a stick: Great science tool in the right hands, evil weapon in the wrong ones.
Paul Paulson weapon? More like a tool
Digital Pyro Well... as wiki says: "A tool is any physical item that can be used to achieve a goal." So a weapon is just a tool used to achieve the goal of creating dead bodies.
Thanks for the idea
Paul Paulson weapon and tool may not have a difference in meaning as far as aliens communicating in coffee mug stains are concerned
even better, it's litrally used to cut light
At Roche Medical electronics we had a Schlieren through an Aquarium tank ( round pinhole light with round black dot obturator) to a video camera: we could image the ultrasonic beam patterns emanating from (3-Lens) Cloverleaf fetal monitor transducers. The cast epoxy lenses sometimes were improperly bonded to the flat PZT crystals, and the Schlieren clearly showed black streaks in the conical “flashlight beam” pattern emitted from the ultrasonic lenses.
We also had a sound pressure force balance that had 90 degree corner (point-up) covered in ultrasound-absorbing rubber suspended in another tank from a microbalance. When the Ultrasonic transducer was aimed at the rubber corner, the milligram “force” created by the ultrasonic sound pressure (deflected at 45 degrees) was proportional to the milliwatts of ultrasonic energy emitted through the water. Bureau of Standards method based on the paper by my Manager (pronounced “Ya-niss”) Janis Ziedonis. In the early 1970s. Peter Bourdelle
Usually I hate added sound effects that are obviously fake, but in this case it works really well to add to the effect. Well done.
For the sound thing, maybe try a speaker with a sound frequency close to a multiple of your camera framerate.
This, or use a stroboscope LED.
that might be cool. i'd like to see a bull-whip crack. i think you need to break the sound barrier to have a powerful visual.
i hope im not completely false but i think when he is making sound by blowing over a waterbottle there should be a standing wave in the bottle and you don't need the shuttereffect
For the standing wave he'd need something with a very small wavelength (to see it in the reflection), and therefore very high frequency -- at least a few thousand hertz. Maybe a piccolo?
With a balloon
You should use a wave form generator to Make low frequency sounds and record the pressure waves in smoke in front of the camera.
Low frequency sound waves still move at the speed of sound. They would be very hard to see. Might be a cool way to see standing waves though.
Love that turbulent flow!
I love literally everything you do.
WHAT ABOUT MORE COLORS? (4 pieces of celophane, splitting the focal point into quarters; 8 splitting the point into eighths; 16 into sixteenths.... etc.)
th-cam.com/video/DzWBhdTIMD4/w-d-xo.html
guys dont click on it its not an experiment its just an ad! ^^^
It would be cool if you used a continuous spectrum filter. The only way I can think of to make it is by printing it off on a transparency sheet. Might give cooler images.
Why has it taken me 3 years to mind this!!! Amazing videos thanks
This... looks so cool. Getting so many vaporwave vibes. There's some serious visual art potential with this, hot dayum
I would like to see some schlieren footage of the GTAW process of welding. The shielding gas used (argon) emerges fairly cold compared to the electrical arc that does the welding, and might make for some very strange patterns. Given the sheer amount of light emitted, along with huge UV radiation, I'm not sure how well it would be photographed or video taped.
Do an electric arc
Oooh, that would be cool
"Do an electric arc..." off of a flame.
th-cam.com/video/DzWBhdTIMD4/w-d-xo.html
Maybe the formation of NO2 by striking an arc though the air could be visible this way its refractive index is only ~0.3% tough
This video is satisfying to an infinite level !! It is nuts. So beautiful to watch
Really cool to see you try the color filters idea... worked out great!
The Shlieren affect sounds like what i get after 4 beers. I start shlieren my words.
+aDistressedLiver I suppose your channel name is pretty fitting then.
aDistressedLiver lol!
your language has a lot of shlieren in it ......
You should do a video with the super slomo guys. Try to see if you could see the sound waves with their equipment.
Meg Alyssa Counter Proposal: use Destin’s cameras from Smarter Every Day instead.
I only looked at the thumbnail and in already crying from its beauty and I have never liked a video so fast!!!
That was absolutely amazing!! So inspiring!
Is it possible to use not two colored halves but four different colors in quadrants to see not only light deflected vertically but also horizontally?
Yes, and there are methods of using a mosaic of various colors that are offset by small amounts and would provide a large number of colors in an image. These colors then can be related back to the angle the light is deflected vertically and horizontally allowing you to obtain quantitative information about the flow field.
The results wouldn't be as meaningful or nonsensical with more than two slices. Light acts as a wave so it has a very tight interaction with PI. Dividing negative and positive PI into colors results in really nice transitions between those colors, dividing it further gives unexpected and seemingly chaotic color changes.
Now a smooth gradient across each hemisphere would correct the chaotic change problem and likely produce some interesting visuals.
Exactly my thought!
Bump, exactly what I thought
would that be super duper pretty?
I love this channel, Always so exciting when I see it on my feed
Those were some awesomazing ultra plus images!
Absolutely amazing and interesting stuff. I love your channel, your message, and all you do to further expose people to science and educate the public!!!
Clearly his sphere analogy is bunk, a cow approximates a donut, not a sphere.
true!
Great video enjoyed both of the videos on this
Ohhhhhhh that balloon popping through the two-color filter, instant thumbs-up!
Awesome video! I love your choice of colors.
Love to see this revisited
Who you gonna call? Slow Mo-guys!
Or SmarterEveryDay
This is very true, I got audible and although i already like long car rides and flying, it made them even better.
i love his videos and how he explains it in depth
you saying "rainbow schlieren" made me wonder how it would look to use 6 colors of triangle (sorry indigo) converging on the focal point instead of cyan and magenta. I only go with 6 because it would keep a horizontal separation between ROY and GBV, commonly considered the warm and cool colors respectively
I am currently making a schlieren image of a cavitation bubble for a major school project because of your previous video
We actually use a lens and put the camera on one side and the light source on the other because we can't afford a big parabolic mirror. Where did you get yours?
My question is how could one make one of these setups for cheap in their own? Not really in college or anything, I just wanna do this for fun. If you know any cheap materials, please let me know!
The quality won't be as high as in this video and you can only film things the size of the magnifying glass, but for a cheap home setup it is fine. Also make sure the room is dark enough.
Koos Naamloos so what materials should I buy to set this up? I don't know where to start, but you seem to know a lot lol
You'll probably already have most of it. For the camera I used about the same as what veritasium used, because auto focus is something you don't want. You can position the camera with some books if you have nothing else. You also probably have a razor blade or precision knife lying around, or else you can buy one. The magnifying glass has to be at least 10 cm (4 inch) in diameter, and as a point light source you can probably use a modified led (see link previous comment). You can try different objects like a candle to test if it works
This is wonderful, useful and beautiful.
I was able to find an old Olympus iSpeed 3 high speed camera and a 12in parabolic mirror for a really good price on eBay this year. I've been having such a good time to say the least. BB's, the tip of a whip cracking, supersonic flow from an air compressor, etc. I feel like a kid in a candy shop now, and the candy shop is in my basement! 😁 Your videos were very helpful to me during the process of setting up my schlieren system. Thanks man!!
For apples next iOS update they should use this as their backgrounds
You could also use two light polarizers.
Put two opposite light filters in the set up to cancel out some of the unneeded coloration. One in front of the light source cutting it in half and one in the normal place.
is it just me or the sequel to this video is the perfect opportunity for the Slo Mo guys and him to collaborate.
It looks like it's underwater. Seriously amazing.
I was waiting for a new Schleiren video for so long! Thanks Derek!
Supreet Sahu
"Schlieren" means "streaks".
What you wrote is closer to Schleier which is German for veil/veils. :P
Simone?
*could you do this with more than 2 color filters?*
I dont think so no
actually yes, how it would look that's a different story but you could put the light between 4 filters or 8 or any amount as long as you can get them to be roughly a circle where the light gets focused.
Why not a whole rainbow filter? Either linear or radial.
Yes you can! A rainbow filter would work really well.
There's a whole field of research which uses radial or linear rainbow filters for this exact purpose (Rainbow Schlieren Deflectometry). The hue of the transmitted light can then be directly linked to its deflection, and the refractive index of the transmitting medium (and its temperature by extension) can be calculated as a result.
It's a really useful and powerful analytical tool. Well done on coming to this conclusion by yourself- the original publishers of this method were at NASA, I believe.
I love the color images!
Brilliant! I love your easy informality.
SlowMo Guys + Veritasium = seeing sound?
fun fact, you can also read actual books while in a plane.
Fun fact, not all planes have phone chargers
Bill gates is famous for carrying a bag of books on a plane. Of course he owns the plane so there's more space to be had...
@Mustache Merlin how many books do you hope to go through on a plane trip?
One word---amazing!
Awesome imaging!
It is debatable to what degree a shockwave can be called sound. Many definitions of sound do not include shockwaves. I think it would also be more interesting to try and see a standing wave. If you tried a clear Rubens' tube, you could possibly directly see the relationship between the standing wave in the tube, and the flames up above. If you are able to see standing waves, it would also be cool to see the difference between cylindrical and conical bore wind instruments.
I think trying to image a standing wave is an excellent idea - I came here to post it if it were not here. The advantage is that it stays in the same place, and you should see the air pressure in the non-fixed part of the wave go up and down at the frequency of the note. Tune the frequency with the fps of the camera, and you should be able to get a clear result.
A sound becomes a shockwave at 190 dB if I recall correctly
Do opening a cold can
Pouring cold air from one glass to another or something, that is super cool! Pun intended.
With the boys?
FALprofessional Finnaly I found another one meme lover!
this is incredible!
To see sound you have to strobe the led at a frequency very close to that of the sound. This will “freeze” the compressed and rarified sections of air long enough to see them. You’ll only be able to get one frequency at a time.
I've head that Destin has a 111,000 fps camera!
That's cool!
And also +Piyumal Perera STFU I just reported your channel for mass advertising.
What camera is he using @ 2K/Sec ?
"Slow Mo guys"?!?!!?!!?!!?
Kill Me smarter every day most likely
That would be soooo awesome!
infernternety I met him irl
Nice Job explaining this effect. Many vids on the web are not very clear.
This is just amazing. Thank you for shearing it with us. I would suggest, not sure if it work- try to image of a microwave magnetron, or/and a Tesla coil discharge.
Surely inhaling that in [5:50] can't be good for you ;p
Amazing as always
I sprayed cough surpressants into my eye just to get a kick on a rave party.
It doesn't produce anything unusually toxic. Burning most organic things just makes water CO2 and CO.
If you look up the structure of the chemicals that that ball is made of, you will find that it is made of: hydrogen, carbon, oxygen, and nitrogen. Hydrogen burns in to water, Nitrogen does not burn, and carbon burns to carbon dioxide and a bit of carbon monoxide. It's much less dangerous for your health than sitting around a camp fire.
kindpotato and as we all know Carbon mono oxide is totally harmless
And what about him burning it inside a wooden cupboard?
Make it loud. Use two wooden plates and slap it together - much louder than hands. Use ear protective gear.
Milan Karakaš that doesn’t change the speed of sound, just the amplitude of the shockwave
@@nicholasvarner2706 But, what I said? Make it loud, not fast. Okay? I am not talking about breaking sound barrier, but rather making Schlieren image of the shock wave which should be loud enough to be visible.
@@milankarakas3005 wot, sound travels at a constant speed through a medium, why would louder sound make it more visible, when the problem is that he cant catch the sound waves with the framerate he has.
The crack of a whip, when the loop of the the whip causes a sonic boom. Observed under Schlieren imaging
This is amazing!
These videos are educational art. keep up the good work ❤️
To all the people complaining about the quality, I watched part of this video on desktop and part on my phone and on my phone, there were higher quality options.
I thought schlieren imaging of the bubble and lit ping pong ball looked a bit like someone had taken a pop art, or psychedelic type, painting and animated it. I may be the only person who sees that, but that's what it looked like to me. It was very cool anyway.
ya its just the way uploads work sometimes if you upload a video to youtube it first goes up in 144p then it uploads then next and the next highest resolution so if you watch early sometimes you dont get good quality
Sara Makes Art It reminds me of Pink Floyd's "Meddle" in particular.
maxybaer123 Yep. This is because the video is still in TH-cams "Processing" phase of uploading it. You can watch it in this phase, but the quality options will not be very good, and it's best to just keep the video unlisted until it's done processing rather than releasing it immediatly
Yeah. Very Hipgnosis.
This is just amazing. Thank your for this video:)
This just blew my mind!
"anurag namdeo" mentioned using more than 2 color filters, and i must say that sounds pretty cool. Can you use other types of filters, like Polarized filters; UV Filters and Infrared filters? With the Infrared filters i think you might need something like an old DSLR camera with its infrared filter removed?
I think a polarizer might be interesting for this.
Really nice vid!
Could you try something more powerful, like maybe a thermite reaction?
I think "more powerful" would be an understatement lol. But that would be rad to see.
That would probably kill the mirror...
I was thinking something more reactive, but not to that extreme. What about magnesium?
Or a hydrogen bomb
Thermite reactions are not that powerful....
5:00 beautiful!! awesome work
I'd love to see the airflow/pressure waves from musical instruments through this,
Maybe imaging the effect from audio would be possible if you made some kind of standing-wave setup in front of the mirror.
Schnozzle ywjuwqqqoopwowiwiw
Where can i get one of those parabolic concave mirrors?
My answer comes a litle bit late ... Try to find sferical mirrors : cheaper AND better results. Look for "Edmund Optics".
Edit : prices seem a lot higher than a few yeas ago ... look for second hand "Newton telescope" with aperture 150-250 mm and take out the mirror ;-)
That was a great video to watch. Thank You :D
A new era of hot knife videos!
Both art and science.
Hey everyone, now that Derek mentioned sound, how does the high speed camera's microphone work? Seems to pick up quiet sounds and then re adjust the pitch, Derek if you're reading, that would be interesting to explain
Max Dub are you sure? Sounds really accurate!
iirc in one of the slowmo guys vidoes one of them told that they make the sound for the slowmo part.
The smooth flow from a fan. The flow out of a whistle. The flow out of a flute. The wing beat of a hummingbird. The waves of a housefly. The flow across a paper airplane. The whistle that comes out when you blow into a bottle in a specific way. The stationary wave produced by a tuning fork in a long cylinder.
And for sound, it doesn't have to be a shock-wave. Try producing a continuous sound that would give continual waves, like that from a tuning fork.
Great Video. At about 5:50, when you make fire reaction travel up the gas (loved the chain reaction visualization), I guess it would show best the dynamics with the use of a IR camera. As we can see thanks to this arrangement, the fire starts and propagates without emitting "flames" (in the visual spectrum). You and people like you make TH-cam worth using and a better place, thanks.
How about some sparkalers?
What about a shape change? One without the cone, just HE. They have the same effect.
Always precise! You have to power to show complex phenomenas as easy thinghs
You’re an amazing human being my friend