William Robb wrote:
> From: "Kevin Waterson"
> Subject: flash duration
>
> > Is it possible to measure the duration of a flash?
> > Possibly in micorseconds or something?
>
> I think you need an oscilloscope for that.
That was my first thought -- a phototransistor and a
sillyscope. (Sorry, couldn't resist.) But since
the oscilloscope's already been mentioned, I started
wondering how else to do it ... what about an oscillator,
a counter, and a phototransistor? With a 1 MHz
oscillator, and the phototransistor between that and
the counter, whatever the counter counts up to is the
duration of the flash in microseconds ...
But not having significant EE-fu, I must second-guess
myself and ask whether I'm correct in assuming that
a phototransistor responds quickly enough for this...?
(If not, then whatever thyristor (photo-SCR??) they
use in flash units that have a sensor ought to be
fast enough.)
-- Glenn
