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Development of SQUID-Based System for Nondestructive Evaluation

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12 Author(s)
R. Nagendran ; Indira Gandhi Centre for Atomic Res., Kalpakkam ; M. P. Janawadkar ; M. Pattabiraman ; Dipak Kumar Baisnab
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This article describes the development of a superconducting quantum interference device (SQUID)-based system for nondestructive evaluation. The setup incorporates an in-house developed thin-film-based Nb SQUID with readout flux locked loop electronics and consists of a liquid helium cryostat with adjustable stand-off distance, a precision XY- thetas scanner for studying both flat and cylindrical samples, and a data acquisition system. The system has been used for the detection of artificially engineered subsurface defects in aluminum plates and to track magnetic-to-nonmagnetic phase transformation in stainless steel [grade 316L(N)] weldment specimens subjected to low cycle fatigue deformation.

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IEEE Transactions on Applied Superconductivity  (Volume:17 ,  Issue: 3 )