Re: Just how much can we magnigy?
From: Andy Resnick (andy.resnick_at_op.case.edu)
Date: 02/14/05
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Date: Mon, 14 Feb 2005 09:17:37 -0500
justbeats wrote:
<snip>
>
> So, to explore that idea, I asked how small a (lone) dot must be before
> it is undetectable with a light microscope. This is clearly well below
> the 0.2 micron resolution limit - but how far below?
It depends on the amount of emitted power and the power received by the
detector. An object that produces 1 W of visible green light can easily
be detected regardless of how small it is (or how far away it is), if
the detector can pick the signal out of the background noise.
Maybe you are asking what the (power) limits of detection- I have worked
with millimeter wave imaging systems that can pull femtowatts out of the
background.
-- Andrew Resnick, Ph.D. Department of Physiology and Biophysics Case Western Reserve University
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