Fresnel Schlieren Optics: Seeing Heat on the Cheap

0:00 Introduction
0:54 Theory
9:12 Component Selection
22:16 Results

[maxk]

WOW! Those results are way better than you let on throughout the video, congratulations. I am fairly familiar with the fluid dynamics, and at least passably knowledgeable in the field of optics, but the image processing part is something I have no experience with. If you ever find the time and are willing to I'd love to see a video describing how you did it and possibly other ways of doing it using existing tools, or maybe more accessible languages like python?

Once again, congratulations on getting such fine results with (and I mean this as a compliment) such cheap equipment. Too many DIY Schlieren videos start with "step 1: buy a thousand dollar telescope mirror" so I'm glad to see someone figure out how to get almost as good looking results with random industrial surplus components, some cardboard, a digital camera, and some coding, it really makes this stuff accessible.

[ovalwingnut]

Wonderful! The multicolored image was about all I thought was available, considering... I was knocked over with your B&W imagery! You are quite clever and sly my friend :) A very engaging talk to boot. The only thing next I have to do is hit that SUB button. Cheers!

[andypepper]

Hm. I was enthusiastic about this up until the end when you had to subtract off the calibration image. If you have to do that, may as well do BOS (Background Oriented Schlieren) which is much simpler and doesn’t need any mirrors OR fresnel lenses…

[haroldaugier]

Hi, what software did you use to correct for the lens defect on the video?

[fractalnomics]

Hi. What would the hot focal 9:01 in free air look like through a Schlieren camera? Would the air heat?

[wcsc]

if i have questions about your video how can i get in touch with you? In great need of help!!!