Ultrasensitive Magnetic Field Measurements in the Presence of High Ambient Noise Levels-Application to Magnetocardiography

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Abstract
A two‐junction superconducting Josephson tunneling magnetometer has been developed for the measurement of magnetic field strengths of the order of 10−9 G/Hz1/2 in an unshielded environment. The application of the device to the measurement of the heart's magnetic signature, the magnetocardiogram, and the problems associated with the measurement techniques are discussed. It is demonstrated that the fine details of the heart's magnetic signature (the magnetocardiogram) can be resolved in real time in an unshielded environment.