| 摘要 |
<P>PROBLEM TO BE SOLVED: To pursue, to an utmost limit, spatial resolution and time resolution which are not in conventional MEG classified into noninvasive measurement. <P>SOLUTION: Surface emitting semiconductor laser beams which have circular polarized light composed of circular polarized light surface emitting semiconductor laser beams or surface emitting semiconductor laser beams and a quarter wavelength plate are irradiated as lateral optical pumping from an incident window of a gas cell filled with Cs atoms serving as alkali metal steam, and relaxation gas (Ne, Ar, Kr, N2), and a light receiver for receiving optical pumping wavelength from an outgoing window of the gas cell is installed to form a semiconductor laser negative feedback loop. The gas cell is provided with an exciting coil and an output coil to form a magnetic modulator, and elements (a negative feedback surface emitting semiconductor laser, the gas cell, the magnetic modulator and a photo detector) are built in a vibrating magnetic field shield container provided with a brain magnetic field detecting window and having an active canceling function to constitute a noninvasive brain function magnetometer system. Since an evoked magnetic field of 10<SP POS="POST">-13</SP>T-10<SP POS="POST">-14</SP>T or less can be detected in magnetic field distribution of a primary change associated with neural activity of cerebral nerve cells, diversion to a brain computer can be attained, and its industrial value is extremely high. <P>COPYRIGHT: (C)2012,JPO&INPIT |
