Jana MarieAs John King suggested here is a video with a new kind of calculating/getting the schlieren. instead of an steady reference image, I used the frame before the current one as reference.
This causes, that fast changes are visible but steady changes disappear, like the flame of the torch.
This one doesnt work out that well, so I will switch back to a steady image.
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Maybe the time -wise differences were not as good as your nearly optimzed "moire" method, but for a dirt ball simple first test, I think the results were pretty good. The rays travel down an optical path. If that path is stable then the image will be stable. Changes (turbulance) of refractive index from changes in pressure(wind), temperature, or chemical composition should be visible with either technique.
You seem to have a good flame detector. It also looks like it could be a wind detector, or a gas detector. If I was a bird,I would like to be able to see the wind so I could find up-drafts for soaring. I'm interested in taking the technique away from a table top into more open-ended situations.
Good work.
John King 122/1/2016
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