Patent ID: 7656154
Filing Date: 2010-02-02
Classification: G01R,Y10S

Abstract:
1. A magnetic field measuring system comprising: a biomagnetic measurement device including a detection coil and a superconducting quantum interference device (SQUID) magnetometer; an optical pumping magnetometer configured to measure environmental magnetic noise in the biomagnetic measurement device, the optical pumping magnetometer including: magnetometers configured to measure environmental magnetic noise entering the vapor cell of the optical pumping magnetometer in directions except a direction of application of the static magnetic field; magnetometer drive circuits respectively connected to the magnetometers; current converters configured to respectively convert outputs from the magnetometer drive circuits into an amount of current; and output current from the current converter is inputted to magnetic field generating coils, the magnetic field generating coils being configured to apply a magnetic field to the vapor cell, the magnetic field being formed in an opposite phase to the environmental magnetic noise entering the vapor cell in the direction except the direction of application of the static magnetic field.