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Schlieren Optics - Making the invisible visible

submitted by eric3579

9 years 5 months 1 week ago

Science

Demonstration of an optical technique that allows us to see small changes in the index of refraction in air. A point source of light is reflected from a concave mirror and focused onto the edge of a razor blade, which is mounted in front of the camera. Light refracted near the mirror and intercepted by the blade gives the illusion of a shadow.Seen here are the heated gases from a candle flame and a hair dryer, helium gas, and sulfur hexafluoride gas.
How it works and setup

16 Comments

Also this

This may well be the coolest nerd video of the year. I want to build one so badly, but it sounds like the mounting equipment and mirror might run a rather high price.

ant

Submit it!

Also this

ant

jokingly says...

Shut up and take my money!

Indeed the lens does seem a bit spendy. For the specifications of the linked setup article, the mirror (31cm Protected Aluminum) runs about $2550 at Edmund Scientific.

oh god all the *quality. my earth science class is gonna love this.

Boosting this quality contribution up in the Hot Listing - declared quality by RhesusMonk.

That's so fucking cool.

*doublepromote

Yes, @eric3579, like @ant said, submit that "how it works" video. That's quality stuff!

Double-Promoting this video back to the front page; last published Sunday, November 23rd, 2014 7:32am PST - doublepromote requested by lucky760.

Although i think it's very cool, I'll leave it for someone else to sift.

and thanks for the promotes

That's so fucking cool.

*doublepromote

Yes, @eric3579, like @ant said, submit that "how it works" video. That's quality stuff!

ant

jokingly says...

Bah! Fine, I would do it now but full queue. Someone, please kindly give me a point.

Although i think it's very cool, I'll leave it for someone else to sift.

and thanks for the promotes

You should see Schlieren video of a toilet flushing. You will never flush a toilet with the lid up again.

speechless says...

I bet that's true. Wait, does that video exist? Never mind, I don't want to see it!

You should see Schlieren video of a toilet flushing. You will never flush a toilet with the lid up again.

The word visible does not contain the letter A.

I hate you!

The word visible does not contain the letter A.

dag

Comment hidden because you are ignoring dag.(show it anyway)

Sift of the week!

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