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Re: strobe viewing of flames (Was: wind instrument +- filtering of broadband noise)



Various folks have asked:

-----Original Message-----
From: Chuck Britton [mailto:britton@NCSSM.EDU]
Sent: Monday, December 11, 2000 8:55 AM

At 11:33 PM -0800 12/10/00, Leigh Palmer, you wrote about Re: wind
instrument +- filtering of broadband noise:


At 10:50 PM -0800 12/10/00, Bernard G. Cleyet & Nancy Ann Seese wrote:

>has any one looked at the flame with a strobe?

I hope not. The result would be as embarrassing as using flash
photography to capture a TV image.

Leigh

A strobe DISK with a slot perhaps?
Or is the term strobe limited to the flash lamp sort?

Toepler used a slotted disk to examine "singing flames" - reported in
Annalen der Physik in 1866 (Vol 128, page 126 - "Poggendorf's Annalen"). I
used a similar setup to view the flames on a "Rubens Flame Tube" - reported
in AJP in 1983 (Vol 51, No. 9, pp. 848-850). Stephenson and Schoepfle also
used this technique to examine flames in "manometric flame capsules" in 1946
- AJP Vol. 14, page 246. I also tried a high speed, rotating prism camera,
but it showed absolutely nothing. Schlieren projection through a rotating
slotted disk reveals the underlying density fluctuations in the flames.

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