Proceedings of the Second European Workshop on Low Temperature Electronics
J. Phys. IV France 06 (1996) C3-367-C3-372
High Tc SQUIDs for Unshielded Measuring in Disturbed EnvironmentsV. Schultze, R. Ijsselsteijn, R. Stolz and V. Zakosarenko
Institut für Physikalische Hochtechnologie e.V., PF 100239, 07702 Jena, Germany
Directly coupled dc SQUID gradiometers on the basis of YBa2Cu3O7-x for unshielded NDE measurements are investigated. The influence of different SQUID layout parameters on the field sensitivity is shown. A sensitivity of 500 fT/(cm.√Hz) is achieved with a baseline of 3.6 mm. A slit in an aluminium plate was detected in an demonstration of NDE in 1 cm depth with eddy current method.
© EDP Sciences 1996