X-Message-Number: 19384
Date: Mon, 1 Jul 2002 12:29:46 EDT
Subject: Intensity Interferometer 4

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Intensity Interferometer part 4.

 Sound wave, at the elementary level are represented by a kind of 
quasi-particles: phonons. Phonons are to sound what photons are to 
electromagnetics radiation. So, why not an intensity interferometer working 
with phonons? The idea may be extended to other excitation states of bulk 
matter, but today I'll limit myself to sound waves.

In liquids, sound speed is in the 1000 m/s range. If we have a sampling 
system working at 100 Mhz, the sampling wavelength will be 10 micrometers. 
May be the sound wave used has a frequency in the Ghz range. We are 
interested in details down to 10 nm or 1 000 times smaller than the sampling 
wavelength, that is, we will need one millions "experiments" to go to that 
scale. Each experiment must have a duration defined by the difference in 
scale multiplied by the sampling period, that is: (10 micrometers/10 
nanometers) x 1/100 000 000 hz or 10^-5 s. Because we need 1 million 
experiments, the total observation time is 10 seconds. We are in the 
manageable time!

That give only one point, well there may be many detector running 
simulatneously, may be one million or so. Assume we have to cover a surface 
near 1 000 sq centimeters. Each detector would have to cover 10 micrometers 
squared, so 1 millon would cover 1 sq. cm or 1/1 000 th of the total surface. 
We have then to move them 1 000 times and make the experiment 1 000 times to 
resolve an entire brain down to 10 nanometers. This would take 10 000 seconds 
or near 3 h.

I think this is the best we can get without X-rays systems. The most 
interesting fact is that reader could be built with present day technology.  
We could have a problem with building back the picture on a computer, but 
that problem will solve itself in some years. An University reseach 
department could take the challenge to build that reader, but I am not 
optimist on that. Cryonics organizations could do it, but no one is 
interested in up-loading or scanning technology, they may have too more 
pressing reseach needs....

Yvan Bozzonetti.


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