Is it possible to trigger a webcam?

I am trying to make a breakdown experiment
where a high voltage RF pulse is sent of a set of electrodes in front
of a viewport. My pulse is typically about 100mS. I want a cheap/simple
way to see if I have an arc (to correlate that with my other signals).
I think a webcam will have as much resolution as I need. Does anybody
knows if I can trigger the webcam using labview (or some other
program). I can use a second trigger before the power pulse as needed,
but I don't know if those libraries mentioned in other posts allow the
control of the webcam to capture images using a trigger event, and/or
how many FPS can I obtain from a webcam.
Basically, I am thinking of sending a pulse, letting the webcam to
capture frames for say 0.5-1 second. And display the images captured,
so I can save or whatever. I am not interested in analysis. The
contrast should be good, light (arc) and darkness (no arc). Could
anybody recomend a camera that works. I want something as simple to
setup as possible, I don't know if there is a preferable model or
something. For example, I was thinking of the Logitech QuickCam Pro
4000, or the Phillips Vesta PCVC 680K which seems to be the favorite of astrophotographers (good sensitivity in low light conditions).
Thank you very much for any help.
Darien

What immediately comes to mind with a web cam is that at high
resolution the frame rate is liklely to be 15 frames per second, that
means that you could typically expect about two or three frames of full
resolution data. I have had higher but it's unstable more often than
not and easily stopped by any other activity on the USB bus.
As far as triggering is concerned I guess you just aquire data in a
circular buffer and have an external trigger start and if necessary
stop the aquisition into the circular buffer.
If you use a video camera you should get better contrast range, higher
dynamic range, significanlty better focul distances and shutter speed
control. Also if you use firewire you will get all the frames. You
could also record the data without the computer as a high voltage spike
of the type you are describing is likely to stop or ruin just about
everything electronic not within a faraday cage, this could be
challenging when you are tyring to put a hole in the cage to poke a
camera through!
I guess you have some specially coated glass for that?

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Is it possible to trigger a webcam?

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