How to see the invisible | DIY Schlieren Images
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- เผยแพร่เมื่อ 28 ก.ย. 2024
- The cheapest and easiest way to take schlieren images. Usually, schlieren images use a very expensive parabolic mirror, which I didn't have. So, I will show you how to take schlieren images with only a magnifying glass.
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I watched a video of a MIT college professor explaining how to set this system up before your video and you literally did a better job at showing how to do it and making it easy to understand. Thank you!
Glad it helped!
Messed around for about half an hour with a Fresnel lens and was able to replicate your demonstration... sort of. My 8.5"x11" Fresnel lens is so cheap that it was impossible to position my camera to get a good image. But I was able to see cold air poured from a frozen glass.
Perhaps your fresnel lens is backwards? Fresnel lens do have a direction at which they work the best.
Pretty cool... gotta love science.
I learned about this studying "magic mirror" the ancients used.
You're really doing that the hard way.
If you want a better quality version with less rainbows, take a razor blade and put it at the focal point. Been focus the camera on a white sheet that's past the focal point. What will happen is that the razor blade is cutting the four your plane in half so that only half of the information needed to reconstruct the image is available this results in a distorted image that highlights disturbances in the index of a fraction. Same effect, less rainbows, much easier visible
I tried using a razor blade (you might be able to see one stuck in a block of wood in the background somewhere) but the focal point of a cheap spherical magnifying glass is too diffuse and not sharp enough for it to work.
amazing tutorial
Very nice 😁👍👍🐈🐾🐾
Awesome video!
Thank you so much!
Is the test section on the light side or on the camera side of the lens? I'm guessing light side right?
Either side will work
Any chance of making a setup to see turbulence in the sky? Btw great video!
You could use the sun as a point light source but you would probably end up cooking your camera.
@@CrazyNerdInventor But then I could see only the turbulence between lenses and camera right? Not between lenses and sun. Right?
Thanks for the answer!
@@fernandolener1106 you can see disturbances between the sun and the lens.
@@CrazyNerdInventor Awesome! Thanks!
@@CrazyNerdInventor Thanks sir. I was thinking some way to create a tool for flight that could see turbulences in the air.
Yeahh!! Thank you 🙏
Nice
Do you know the resolution in mm that is possible to see?
I need to see particles of 1 micro meter
I have no idea the resolution but I doubt a crappy spherical magnifying glass will give you that resolution.
NIGEL!! WHY THE HELL DOES IT SMELL LIKE A LOCKER ROOM COLLIDED WITH A LABORATORY IN HERE
I was really in need for such a great tip, you saved me work and money
You actually need a sharp edge ('filter' in the diagram) to "split" the high pressure from the low pressure distortions.
Interestingly, the rainbow effect from the lens seems to have produced the same effect.
Now that I know it's possible to do without a dedicated parabolic mirror, I might try it myself with your method. Cheers.
I found that is isn't actually that difficult to create shlerian imaging. The only challenge is to record it with high contrast. I found that you can project shlerian images onto a wall by creating pressure waves in front of a point light source and focusing the image on the wall with a magnifying glass without any rainbow effects or filters. It seems like this Kind of set up is only necessary if you want to have the images directly projected into a camera with high contrast.
the lens was not perfect as the video showed, I think it came from the imperfection of the lens itself.
The razor blade allows you to select which spatial frequencies at the focal point You're going to allow past the focal point. It's a spacial filter. You can even use it to selectively focus on movement in specific directions.
Rainbow effect is due to chromatic aberration of your lens.
I've made that contraption and it didn't work, IT TURNS OUT I DON'T PUT THE FILTER FOR IT 🤦♂
I'd always wanted to try that I just wasn't sure how, or how I could get a 10 inch parabolic mirror 😅 (for under like £4000)
I think the colour adds something, if you don't like it you could always try recording in black and white
Did you place the objects in front of or behind the lens?
It doesn't matter if you place the objects behind or in front of the lence. As long as you put it close to the lence. Hope this helps.
@@CrazyNerdInventor I shall give it a go, I actually have lenses all over the place right now 😂 this is what you get trying to make a camera
I don't know how you do this and what's going on . My English is not very well because of i can't understand perfectly. But i like it.
Amazing😇
❤❤❤
Thank you !
can you use glasses for this
Great job mate 👍
Did you broke the camera ?
No
@@CrazyNerdInventor ok thanks good video I tryed it and it didn't happend for me I don't know why. But good video.
u glass scratched (make this colors)? if you watch you results with different spectrum or use different wavelength or filters (is some new discovery)?
The colors make it cooler
you're a legend
I built the setup described and the results are excellent, I wanted to ask what this phenomenon that you see in the focal point?
what does the diffraction in the specific focal point mean and can we get similar results by using diffraction grating such as CD
We are using refraction between bodies of air of different densities so a CD can't be used. CDs diffract based on the difference of colours, not desinsity of air.
Nice one man
What size lens did you use?
I used a camcorder