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Date: Mon, 04 Nov 2002 20:12:26 -0500
From: Dan Barlow
User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.0.1) Gecko/20020826
X-Accept-Language: en-us, en
Subject: Re: Digital Video
References: <31B584DFA62E8C71.0C1CBE6796076916.B18AF75C14DFDAEF@lp.airnews.net> <8F00A252F2C14580.3F8FE61F79C4C579.70B0DA0307B8BFA6@lp.airnews.net>
Organization: Heller Information Services
Douglas R. Hortvet, Jr. wrote:
> Thank you for your reply - as you perhaps could tell, I have little to
> no knowledge about how to proceed with such a project.
> The application I have for the digital video is a model rocket.
> Thanks for your comments - any more are greatly appreciated.
How about this... optically combine several fast frames into each
video frame by illuminating your rocket with a fast strobe lamp.
It is easy to get strobe lamps into several 100s of Hz or a KHz
and you will just get multiple exposures. You can try this with
an ordinary film camera set in the "B" position, kill all lights
and shoot at night with just the strobe. Use 3M driveway marker
tape to get a bright spot on the rocket. We used this for physics
experiments with pretty reproducible results. The other approach
is to put a 5KHz blinky LED in the nosecone. Easy to do with a
CMOS 555 timer, 3 resistors, 2 capacitors and a 3V lithium coin cell.
Use a high brightness blue LED and it will stand out against the
exhaust flare pretty well... or use a blue filter in addition.
Mount 4 around the cone so you can see them as it rotates...
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