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#1
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Photocell responce time.
I want to use a photocell and a 200MHz fluke scope to measure the number
and duration of flashes made by a digital camera. For those of you who don't know much about digital cameras and flashes, because of the way digital cameras have to meter light from a flash, the flash fires several very fast very short bursts before the "real" flash. I want to know how many, how often and how long these flashes are. What I'm not sure is if a photocell responds fast enough and where I can find spec sheets and a source for one that is fast enough. I'm not sure on the length duration I need to measure but I suspect the pre flashes will last less than 1/40,000 of a second. I'm getting that number from something I read a while back that said 1/40,000 of a second was the shortest exposure time you could get from a flash to stop fast moving action. That was several years ago though so I don't know what is possible today. -- Chris W Gift Giving Made Easy Get the gifts you want & give the gifts they want http://thewishzone.com "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -- Benjamin Franklin, 1759 Historical Review of Pennsylvania |
#2
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Instead of using the CdS cell, why not use a silicon photo diode as the
receiver, I should think their response time would be pretty quick. Paul |
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