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. Content-Type: text/html; charset="ISO-8859-1" [ AUTOMATICALLY SKIPPING HTML ENCODING! ] Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=25037