Environmental Magnetic Noise Reduction of Flat Multichannel Optically Pumped Magnetometer with Signal Space Separation Method together with Auxiliary Sensors

Abstract

In this study, we carried out computer simulations to apply the SSS method to flat multi-channel OPMs with auxiliary sensors and examined the suppression effect of environmental magnetic noise. We assumed that auxiliary sensors are added so that the environmental magnetic noise can be effectively suppressed, and assessed the appropriate position of the sensors. When the auxiliary sensors were circularly aligned with a radius of 50 cm in the plane 40 cm or 30 cm above from the flat multi-channel OPMs with the origin of the SSS method at 10 cm above from the OPMs, the target signal was extracted as an internal component. In addition, in the case of these sensor arrangements, the S/N of 4.3 could be improved to 259.