Abstract
We develop a one-channel high- T c d.c. SQUID heart monitoring system for non-invasive measurement in non-shielded environment. For this purpose we used step-edge as well as bicrystal Josephson junctions for the preparation of planar direct coupled thin film gradiometers and magnetometers. These sensors have been tested for suitability and both kinds of sensor (magnetometer and gradiometer) have been used for measuring the human heart activity (MCG) in a shielded environment. Because the system will be used for clinical instrumentation without any shielding, the influence of compensation of the earth's magnetic field in non-shielded environment with Helmholtz coils has been investigated. We also developed software for a real time data display, storage and further processing (e.g. digital filtering).
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