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Schlieren Optics Homework Help: Visualizing a Supersonic Wind Tunnel
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[QUOTE="Quantum Defect, post: 5029071, member: 537816"] I have never done Schlieren optics, but it is something that I am interested in. I have done mostly experiments with lasers over my research career, which has involved a lot of finicky optical setups. It seems like the simpler set up that is shown in the materials at Harvard might be easier to implement. The images in the YouTube video above are pretty good, I thought. Unless you are measuring much smaller effects in the wind tunnel which require the longer path length in your setup, you might consider simplifying. There are a lot of mirrors in your scheme, and the optical path length is very long, so alignment will be difficult. You are also using some things in your path that are going to be problematical -- not so stable (the lab jack) which may make your life miserable. With the setup shown in the Harvard demo, there are relatively fewer optical components, with less to go wrong. The Schlieren effect is obtained from tiny changes in refractive index (wiggling of the light beam) in the observation window. What happens if your optics are not stable? Your beam will have additional sources of wiggle. Your "pin hole" looks pretty ragged and is also quite large. Another thing to think about is the age of the design above. So much has been changed by the advent of really amazing consumer technology. When I was in graduate school (mid 80s) , we were beginning to see some of the very first CCD detectors being used in experiments. You now can buy these for tens of dollars, and they are a feature on everyone's smart phone. I grew up in the age of film, I took polaroid pictures of the oscilloscope traces for some work as an undergrad. I remember being frustrated with not being able to take holiday pictures indoors without a good flash, etc. etc. All that I am saying is that if the setup above might be designed to work well with yesteryear's photographic technology, and you might be able to do much better without any significant increase in expense. See also: [URL]http://scitation.aip.org/content/asa/journal/jasa/129/4/10.1121/1.3588692[/URL] [PLAIN]http://www.mne.psu.edu/psgdl/Pubs/2003-Pandya-JASA.pdf[/PLAIN] [URL]http://alexandria.tue.nl/repository/freearticles/617406.pdf[/URL] [MEDIA=youtube]TOhxr643YuA[/MEDIA] [/QUOTE]
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Schlieren Optics Homework Help: Visualizing a Supersonic Wind Tunnel
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