Re: Time-gated vs Time-Resolved Fluorescence detection

On 4/20/07 3:07 PM, in article
1177106851.017312.285640@xxxxxxxxxxxxxxxxxxxxxxxxxxxx,
"maz.khorasani@xxxxxxxxx" <maz.khorasani@xxxxxxxxx> wrote:

Hi,

Can someone please explain the difference between Time-Gated and Time-
resolved (in regards to fluorescence detection). I cannot seem to
find a clear cut difference between the two (or are they used
together?).

Thanks.

I would interpret in as follows:

Time-gated means that your channel passes a signal (and noise) only during
the time that the gate is open. Usually, such gates are independent of what
is coming through the channel although it does not have to be that way.

Time-resolved means that a signal can be separated from another signal or
interference based upon two or more signal not overlapping in time.

Often, such as in laser rangefinders, a gate is set so that only signals
corresponding to possible ranges are let through. This avoids having noise
trigger other electronics at times when true signals cannot be present.

Bill
-- Fermez le Bush--about two years to go.


.

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