For the last couple of weeks I have been tinkering with the Chromatic Dispersive Light Schlieren that I built. If you haven't read the other couple of posts about this setup check them out HERE and HERE. To summarize the only difference between this setup and the other ones that I have built is the light source. As the title suggests this uses a Chromatic Dispersive Light source for the Schlieren illumination or CDLS as I like to call it. To make this I placed a prism and a collimating lens right after the LED light source to break the white light from the white diode into all the colors of the rainbow (at least as many as a white LED can produce anyway!). Check out the first link above to see what I mean.
The reason I decided to try this is getting a Schlieren stop in just the right place, at the focus of the mirror, with a camera that has a zoom lens is difficult and sometimes impossible. My hope was the Chromatic Dispersive Light Schlieren would eliminate the need for a Schlieren stop and so far it seems to work.
Above is a short video showing the results that i got with a candle. The reason I am using a candle to test this is because it's a easy thing to photograph because of all the wonderful hot air it makes ;-)