How does the D3 achieve such high ISO?

Started Feb 17, 2008 | Discussions thread
Marianne Oelund Veteran Member • Posts: 7,788
The mathematician's vs. the engineer's approach

ohyva wrote:

ejmartin wrote:

Really? Googling "dark current noise", the first listing
http://www.roperscientific.de/tdark.html

I just wonder why then so many research activities in silicon sensor
structures to minimize the dark current. Like this one WO patent
http://www.wipo.int/pctdb/en/wo.jsp?wo=2005083791

Any isolation should not make any effect to thermal noise as far as I
can remember to my very much past phisics lessons.

I can assure you that the dislocations which that patent addresses are without question of thermal origin. Do you honestly believe that component of dark current would persist at absolute zero?

To the main point of this post:

Mathematicians expend considerable effort studying single-point anomalies such as singularities, path-dependent limits, etc., which have no practical real-world counterpart (aside from black holes). Engineers recognize what is most significant, pertinent and practical, and limit their dealings to such aspects.

What you are doing is devoting a disproportionate effort to effects which, if significant, would already have been included in the noise models. The models work very well, to experimental accuracy. That has been repeatedly demonstrated, and if you insist on pursuing negligible effects, assume that you will be on your own with them; you can certainly count on no support here.

Finally, it is beyond annoying to have one who has asked a question, then turn around and put up a series of arguments against the answer provided. Emil has been more than patient with you - far more than you deserve.

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