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.
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Schultze et al. (1996) studied this question.
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