Patent ID: 11914012
Assignee: HAMAMATSU PHOTONICS K.K.
Field: Measurement (Instruments)
Classification: CPC G  A | IPC A  G

Claim 2:
3. The brain measurement apparatus according to claim 1,
wherein the magnetoencephalograph further includes:
multiple magnetic sensors for active shield configured to measure a fluctuating magnetic field at the position of each of the multiple optically pumped magnetometers; and
an active shield coil for canceling the fluctuating magnetic field, and
when measuring the brain's magnetic field, the controller controls a current to be supplied to the active shield coil based on measured values of the multiple magnetic sensors for active shield and determines a current to be supplied to the active shield coil so as to generate a magnetic field that cancels the fluctuating magnetic field at the position of each of the multiple optically pumped magnetometers.