We have developed a scalar-type optically pumped magnetic gradiometer for biomagnetism measurements in the earth’s magnetic field. In this study, a magnetic field simulating a magnetocardiogram could be detected without a magnetic shield. Biomagnetic measurements have advantages such as non-contact and source estimation. The optical pumped atomic magnetometer (OPAM) is a small size and can operate at room temperature, so it is possible to replace the superconducting quantum interference device (SQUID).
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