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Schlieren optics allow us to see the movement of air

145 comments
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level 1

So, what is "Schlieren Optics" and how is it letting us see this cool stuff?

level 2
594 points · 9 months ago

Instead of seeing differences in intensity of the light like with a normal camera system, we are seeing differences in the density of the air, which lead to changes in refractive index.

level 3

Neat!

level 4
[deleted]
14 points · 9 months ago

Witchcraft!

level 5
21 points · 9 months ago

Neatcraft?

level 6
[deleted]
4 points · 9 months ago

I think that’s what Martha Stewart practices.

level 3

What could we do with this?

level 4
Comment deleted by user9 months ago(13 children)
level 5

Oh shit

level 6

Zoinks!

level 6

Found the ghost.

level 7

Not without Schlieren Optics you didn't

level 6

And farts!

level 5

Which is exactly why they don't use these on ghost hunter shows.

level 6

Rekt. Ghost Hunter shows.

level 5

And farts

level 7

That’s great

level 5
[deleted]
12 points · 9 months ago

See farts.

level 5

2spoopy4me

level 5

Farts*

level 4

Finally find out if he who smelt it truly dealt it.

level 4

Are you asking for practical applications?

level 5

Yeah

level 6

In the interest of giving you actual information and not being wrong, I lifted this from Wikipedia.

A typical application in gas dynamics is the study of shock waves in ballistics and supersonic or hypersonic vehicles. Flows caused by heating, physical absorption[6] or chemical reactions can be visualised. Thus schlieren photography can be used in many engineering problems such as heat transfer, leak detection, study of boundary layer detachment, and characterization of optics.

https://en.m.wikipedia.org/wiki/Schlieren_photography

level 7
level 8

Thanks!

level 7

Schlieren photography

Schlieren photography (from German; singular "Schliere", meaning "streak") is a visual process that is used to photograph the flow of fluids of varying density. Invented by the German physicist August Toepler in 1864 to study supersonic motion, it is widely used in aeronautical engineering to photograph the flow of air around objects.


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level 6
Comment deleted by user9 months ago(1 child)
level 7

So you'll see the denser microorganisms next to the relatively still air? Or do they make waves?

level 6
3 points · 9 months ago

They're commonly used in wind tunnels, especially high speed ones. That's where I've learned about them and used them. Cool form of flow visualization but can be really hard to setup.

level 4

Find out where that draft is coming from

level 4

Design cars

level 4

Track xenomorphs.

level 4

motion tracker from first alien movie?

"micro changes in air density"

level 3

I understand all of those words individually

level 4

Not sure if you’re just kidding but in case other people are curious, but also lazy, the refractive index is how much a material will bend light. As the air changes density, so does the amount light passing through it is bent.

Coatings on glasses affect the refractive index to make your lenses less reflective. The refractive index of a prism splits white light into a rainbow.

level 3
3 points · 9 months ago

I almost felt proud of myself for understanding... refractive index wat

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