Re: looking for nanosecond pulse LED
- From: Phil Hobbs <pcdhSpamMeSenseless@xxxxxxxxxxxx>
- Date: Wed, 16 Apr 2008 22:22:35 -0400
simba wrote:
I am looking for a LED than can be driven buy pulse with width of
10ns~100ns order.
Such a LED is required for measurement of velocity of small particles
( size of some 10 microns order ) as light source. Commonly used light
source for such application (a Particle Image Velocimetry
application ) is high repetition pulse laser. However, LED could be a
choice if both illuminating power and speed of the LED is enough.
Any information or advice about that kind of LED product will be
deeply appreciated.
Thanks.
I haven't tried recently, but it used to be true that an ordinary display LED had a 3 dB modulation bandwidth of around 30-60 MHz. You can certainly do 100 ns pulses, and with a bit of work you should be able to do 10 ns. Going to 1 ns would probably be very difficult.
Some VCSELs can do 50 ps or even a bit faster.
Cheers,
Phil
.
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