Comments on: Another Thesis Bleg: Short Pulse Duration Stroboscope http://selenianboondocks.com/2007/05/another-thesis-bleg-short-pulse-duration-stroboscope/ Random Musings from the Warped Minds of Jonathan Goff, Ken Murphy, John Hare, and Kirk Sorensen Thu, 02 Sep 2010 05:17:09 -0700 http://wordpress.org/?v=2.8.4 hourly 1 By: Anonymous http://selenianboondocks.com/2007/05/another-thesis-bleg-short-pulse-duration-stroboscope/comment-page-1/#comment-2292 Anonymous Thu, 14 Jun 2007 21:42:00 +0000 http://selenianboondocks.com/?p=407#comment-2292 How about a pulse laser (LED)? The pulses are measured in nanoseconds, you can pass it through a magnifying glass to cover more area, and you can get some very high speed film and expose it in total darknes with the shutter wide open (bulb setting). How about a pulse laser (LED)? The pulses are measured in nanoseconds, you can pass it through a magnifying glass to cover more area, and you can get some very high speed film and expose it in total darknes with the shutter wide open (bulb setting).

]]> By: tankmodeler http://selenianboondocks.com/2007/05/another-thesis-bleg-short-pulse-duration-stroboscope/comment-page-1/#comment-2281 tankmodeler Thu, 31 May 2007 17:21:00 +0000 http://selenianboondocks.com/?p=407#comment-2281 If you have any contactes in the aero engine industry (and I mean the OEMs not the repair or parts suppliers) you might want to see if one of them will loan you a camera. You could let them have copies of your research. The hook for them is that it may have application to the flow from oil jets to bearings inside turbomachinery, always a prime concern to engine manufacturers.<br/><br/>The manufacturers should have several types of cameras and light set-ups to capture things like blade off tests and bird strikes. You'll need to get right to the guys in the R&D or design departments to swing such a thing in a week, though. <br/><br/>I know this because I worked at such a place for 15 years and know that they generally have a number of cameras available (failed blade off events at 5000 fps are very cool!)and they always need more info on fine jet fluid flow.<br/><br/>HTH<br/><br/>Paul If you have any contactes in the aero engine industry (and I mean the OEMs not the repair or parts suppliers) you might want to see if one of them will loan you a camera. You could let them have copies of your research. The hook for them is that it may have application to the flow from oil jets to bearings inside turbomachinery, always a prime concern to engine manufacturers.

The manufacturers should have several types of cameras and light set-ups to capture things like blade off tests and bird strikes. You’ll need to get right to the guys in the R&D or design departments to swing such a thing in a week, though.

I know this because I worked at such a place for 15 years and know that they generally have a number of cameras available (failed blade off events at 5000 fps are very cool!)and they always need more info on fine jet fluid flow.

HTH

Paul

]]> By: Paul Breed http://selenianboondocks.com/2007/05/another-thesis-bleg-short-pulse-duration-stroboscope/comment-page-1/#comment-2280 Paul Breed Thu, 31 May 2007 17:05:00 +0000 http://selenianboondocks.com/?p=407#comment-2280 I'd second the LED suggestion.<br/>Charles can help you with that as well. I’d second the LED suggestion.
Charles can help you with that as well.

]]> By: Bruno Berger http://selenianboondocks.com/2007/05/another-thesis-bleg-short-pulse-duration-stroboscope/comment-page-1/#comment-2279 Bruno Berger Thu, 31 May 2007 17:04:00 +0000 http://selenianboondocks.com/?p=407#comment-2279 As Scott said... try an array of high power LEDs. We got some good results with such a setting. Keep the capacity of the wiring an the driving electronics as low a possible. <br/>Good luck with your thesis!<br/><br/>Bruno As Scott said… try an array of high power LEDs. We got some good results with such a setting. Keep the capacity of the wiring an the driving electronics as low a possible.
Good luck with your thesis!

Bruno

]]> By: C. Scott Ananian http://selenianboondocks.com/2007/05/another-thesis-bleg-short-pulse-duration-stroboscope/comment-page-1/#comment-2278 C. Scott Ananian Thu, 31 May 2007 16:39:00 +0000 http://selenianboondocks.com/?p=407#comment-2278 I'd read the datasheets for your favorite LED manufacturer very closely. The bandwidth of an LED is pretty darn high. The reason that strobes are used instead is because LED's aren't nearly as bright. But 500ns (2MHz) is pretty darn slow for an LED. You should be able to wire up a number of them (be mildly careful with capacitance) and compensate for the low brightness with a longer exposure. This depends on your ability to manually tune the LED frequency to match your pulse frequency, but it seems like you can control both sides of that pretty closely.<br/><br/>I think that should solve your problem.<br/> --scott I’d read the datasheets for your favorite LED manufacturer very closely. The bandwidth of an LED is pretty darn high. The reason that strobes are used instead is because LED’s aren’t nearly as bright. But 500ns (2MHz) is pretty darn slow for an LED. You should be able to wire up a number of them (be mildly careful with capacitance) and compensate for the low brightness with a longer exposure. This depends on your ability to manually tune the LED frequency to match your pulse frequency, but it seems like you can control both sides of that pretty closely.

I think that should solve your problem.
–scott

]]> By: Ed http://selenianboondocks.com/2007/05/another-thesis-bleg-short-pulse-duration-stroboscope/comment-page-1/#comment-2277 Ed Thu, 31 May 2007 14:15:00 +0000 http://selenianboondocks.com/?p=407#comment-2277 Maybe you could get your hands on an old Super-8 camera and modify its drive motor to take pictures at 2000 frames a second, and set up some really bright lights so that the film will expose properly in that short timespan. Then again, I don't know if anyone even makes Super-8 film anymore.<br/><br/>Or perhaps you can do something with multiple cameras, sort of like they did in that scene from the Matrix with Trinity hanging in mid-air; I'm thinking an array of 10 cameras that are 36 degrees out of phase. With some software tricks you'd have a 4D visualization at high speed. Maybe you could get your hands on an old Super-8 camera and modify its drive motor to take pictures at 2000 frames a second, and set up some really bright lights so that the film will expose properly in that short timespan. Then again, I don’t know if anyone even makes Super-8 film anymore.

Or perhaps you can do something with multiple cameras, sort of like they did in that scene from the Matrix with Trinity hanging in mid-air; I’m thinking an array of 10 cameras that are 36 degrees out of phase. With some software tricks you’d have a 4D visualization at high speed.

]]>