SQUIDS for NDT: the technology and its capabilities

1993 
The Superconducting QUantum Interference Device, or SQUID, is the most sensitive detector of magnetic fields. As such, a potential use is in electromagnetic NDT. Although its impact has so far been limited by the impracticality and cost of systems requiring liquid helium, the technology should become much more accessible if the new high temperature superconductors (HTS) fulfil their potential. It is thus appropriate to outline SQUID technology in the context of past, present and possible future capabilities for the NDT engineer. In this paper we describe the structure and properties of the SQUID which are relevant to NDT, making comparisons with other sensors where possible
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