Axial Gradiometer 1st Order

For Magnetocardiography (MCG) applications in unshielded environment, our Axial HTS rf SQUID Gradiometer System is especially well suited. The gradiometer consists of two SQUID magnetometers, each with a sensitivity better than 30 fT/root(Hz) at 77 K (in shielding in the white noise regime, > 30 Hz). The gradiometer baseline is adjustable from 6 cm to 10 cm. The system uses our novel substrate resonators as tank circuits. The liquid nitrogen dewar holds for approximately 5 days (inside volume 5 l). The system is portable. The SQUID readout electronics is automated, the working points are adjusted by the integrated microcontroller.