X-Message-Number: 25037
From: 
Date: Sun, 14 Nov 2004 06:06:37 EST
Subject: He-3 brain reader

I have taken this subject a number of time. Here I am interested in the 

technological requirement for a demonstrator. It will not produce any picture, 
its 
objective is to display a signal from a very small volume typical of a neuron 
link, a dentritic button.

First there must be a source of polarized He-3. The favored technology is 

polarization of radiofrequency excited helium by right circularly polarized 1083
nm infra-red light from a diode laser amplified by active optical fiber.
(The next step would be a dye tunable laser pumped by a powerful cooper vapor 
laser).

Second, the gaz is condensed in a glass cell coated with cesium to limit 

depolarization on the wall. The liquid He-3 is mixed with superfluid He-4, so 
that 
it keeps its polarization for hours at least. (This part would remain the 
same on the complete brain reader).

A polarization control system using a backward propagating laser beam with a 
90  phase shift would be useful.

The signal detector is a low noise (cryocooled) RF receptor with a very 
narrow band selectivity (0.02 Hz).

The scaner would use powerful electromagnets, the selected technology is LN2 
cooled berylium coils in aramide and carbon fabric containers so that they can 
whistand the strong magnetic pressure.

If someone is interested by the RF receptor technology, I could finance it.

Yvan Bozzonetti.


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