Advantages of Foveon sensor Locked

Started Jun 23, 2013 | Discussions thread
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xpatUSA
Senior MemberPosts: 3,540Gear list
Re: There is at least one absolute, and you refuse it.
In reply to bobn2, Jun 24, 2013

Bobn2 wrote:

Certainly, I was assuming visible light, between about 0.45 and 0.75 μm, where as you see from your graph the transmission is zero.

Zero??!! Fell right into the trap

May I recommend some light reading on absorption depth in silicon? It involves the probability of about 63% absorption vs depth for a given wavelength. In the graph above we see that, for 0.75um, 63% of photons are absorbed at a depth of about 10um in silicon leaving 37% free to proceed onward through the material. In other words, the transmissivity at 0.75um is 37% at 10um depth. Ergo, the transmission is not zero in spite of the claim made above.

Here's a 14MP Foveon sensor cross-section - not real thick as can be seen.

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Regards,
Ted http://kronometric.org
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