2024/12/24 by Naota Sekiguchi, Yuta Kainuma, Sekiguchi, Naota +23 · 1 citation
Engineering · Physics and Astronomy · #Applied Physics (physics.app-ph) #Atomic and Subatomic Physics Research #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Magnetic Field Sensors Techniques
paper · pdf · doi:10.48550/arxiv.2412.18101
openalex publication_date 2024/12/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We employ a dry-type phantom to evaluate the performance of a diamond quantum magnetometer with a high sensitivity of about 6~pT/√(Hz) from the viewpoint of practical measurement in biomagnetic sensing. The dry phantom is supposed to represent an equivalent current dipole (ECD) generated by brain activity, emulating an encephalomagnetic field. The spatial resolution of the magnetometer is evaluated to be sufficiently higher than the length of the variation in the encephalomagnetic field distribution. The minimum detectable ECD moment is evaluated to be 0.2 nA m by averaging about 8000 measurements for a standoff distance of 2.4 mm from the ECD. We also discuss the feasibility of detecting an ECD in the measurement of an encephalomagnetic field in humans. We conclude that it is feasible to detect an encephalomagnetic field from a shallow cortex area such as the primary somatosensory cortex.